Physical Review B最新文献

{"title":"Pseudo-Majorana functional renormalization for frustrated XXZ spin- 12 models with field or magnetization along the spin- Z direction at finite temperature","authors":"Frederic Bippus, Benedikt Schneider, Björn Sbierski","doi":"10.1103/physrevb.111.054420","DOIUrl":"https://doi.org/10.1103/physrevb.111.054420","url":null,"abstract":"The numerical study of high-dimensional frustrated quantum magnets remains a challenging problem. Here we present an extension of the pseudo-Majorana functional renormalization group to spin-1/2 XXZ-type Hamiltonians with field or magnetization along spin-Z</a:mi></a:math> direction at finite temperature. We consider a U(1) symmetry-adapted fermionic spin representation and derive the diagrammatic framework and its renormalization group flow equations. We discuss benchmark results and application to two antiferromagnetic triangular lattice materials recently studied in experiments with applied magnetic fields: First, we numerically reproduce the magnetization data measured for <b:math xmlns:b=\"http://www.w3.org/1998/Math/MathML\"><b:mrow><b:msub><b:mi>CeMgAl</b:mi><b:mn>11</b:mn></b:msub><b:msub><b:mi mathvariant=\"normal\">O</b:mi><b:mn>19</b:mn></b:msub></b:mrow></b:math> confirming model parameters previously estimated from inelastic neutron spectrum in high fields. Second, we showcase the accuracy of our method by studying the thermal phase transition into the spin solid up-up-down phase of <d:math xmlns:d=\"http://www.w3.org/1998/Math/MathML\"><d:mrow><d:msub><d:mi>Na</d:mi><d:mn>2</d:mn></d:msub><d:mi>BaCo</d:mi><d:msub><d:mrow><d:mo>(</d:mo><d:msub><d:mi>PO</d:mi><d:mn>4</d:mn></d:msub><d:mo>)</d:mo></d:mrow><d:mn>2</d:mn></d:msub></d:mrow></d:math> in good agreement with experiment. <jats:supplementary-material> <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement> <jats:copyright-year>2025</jats:copyright-year> </jats:permissions> </jats:supplementary-material>","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":"29 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143417394","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Spin-split Andreev bound states and diode effect in an Ising superconductor Josephson junction","authors":"Sourabh Patil, Gaomin Tang, Wolfgang Belzig","doi":"10.1103/physrevb.111.l060502","DOIUrl":"https://doi.org/10.1103/physrevb.111.l060502","url":null,"abstract":"The transition-metal dichalcogenides featuring Ising spin-orbit coupling in so-called Ising superconductors offer a unique system to study the interplay of singlet and triplet superconductivity. The presence of high critical fields, spectral properties such as the mirage gap, and field-tunable charge and spin currents in Ising superconductor Josephson junctions are some of the important features. In this Letter, we study an Ising superconductor Josephson junction with a transparent interface and show that Andreev bound states are spin split due to a relative misorientation of in-plane fields in the superconducting contacts. Correspondingly, supercurrent-phase relations display a strongly nonsinusoidal behavior. Introducing additional spin-polarized channels with low transmission results in a nonreciprocal current-phase relation with a diode effect that can be tuned by the in-plane exchange fields. The diode efficiency reaches high values of the order of 40% and is not sensitive to disorder in the junction. Such structures can be realized in van der Waals heterostructures of two-dimensional superconductors and magnets. <jats:supplementary-material> <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement> <jats:copyright-year>2025</jats:copyright-year> </jats:permissions> </jats:supplementary-material>","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":"2 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143401767","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Transition between light-induced attraction and repulsion of nanoparticles on a lithium niobate surface","authors":"E. Asché, R. Zamboni, C. Denz, J. Imbrock","doi":"10.1103/physrevb.111.054305","DOIUrl":"https://doi.org/10.1103/physrevb.111.054305","url":null,"abstract":"Recent investigations have revealed a new phenomenon involving the transfer of charges between metallic as well as dielectric particles and the surfaces of photovoltaic crystals under illumination. Given its potential relevance to microfluidic and nanotrapping applications, understanding and controlling this phenomenon is of considerable interest. In this study, we examine the potential for manipulation of this charge transfer by customizing the induced electric field in terms of its strength and shape. In addition, we explore a method to mitigate this charging effect by introducing a thin layer between the crystal and the particle suspension. Specifically, we investigate the controlled trapping and repulsion of metallic micro-objects and nano-objects using a slowly increasing electric field induced by light in an iron-doped lithium niobate crystal. By employing structured light patterns with modulated amplitudes, we analyze the influence of shape and exposure of the light patterns on the dynamic movement of the particles. Our observations reveal two distinct regimes characterized by an initial attraction followed by repulsion. We present a model based on an electrical resistor-capacitor circuit that explains these two regimes and provides a good estimate of the temporal transition between them. These findings contribute to the advancement of controlled optoelectronic manipulation techniques for particles that utilize ferroelectric crystals. <jats:supplementary-material> <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement> <jats:copyright-year>2025</jats:copyright-year> </jats:permissions> </jats:supplementary-material>","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":"8 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143401711","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Separating spin dynamics modes in iron oxide nanoparticles","authors":"M. Zobel, M. Appel, S. L. J. Thomä, M. Plekhanov, A. Magerl","doi":"10.1103/physrevb.111.l060406","DOIUrl":"https://doi.org/10.1103/physrevb.111.l060406","url":null,"abstract":"The different modes of the spin dynamics in ferrimagnetic magnetite iron oxide nanoparticles (Fe&lt;/a:mi&gt;3&lt;/a:mn&gt;&lt;/a:msub&gt;O&lt;/a:mi&gt;4&lt;/a:mn&gt;&lt;/a:msub&gt;&lt;/a:mrow&gt;&lt;/a:math&gt;) have been addressed by µeV neutron spectroscopy for particles with a diameter of 75 ± 18 Å. In an approach building on intensity considerations over a wide range of wave vectors &lt;d:math xmlns:d=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;d:mrow&gt;&lt;d:mi&gt;Q&lt;/d:mi&gt;&lt;/d:mrow&gt;&lt;/d:math&gt; in combination with diffusion dynamics, we identify three magnetic modes prevailing in distinct &lt;e:math xmlns:e=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;e:mrow&gt;&lt;e:mi&gt;Q&lt;/e:mi&gt;&lt;/e:mrow&gt;&lt;/e:math&gt; regimes up to 1.7 &lt;f:math xmlns:f=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;f:msup&gt;&lt;f:mrow&gt;&lt;f:mi&gt;Å&lt;/f:mi&gt;&lt;/f:mrow&gt;&lt;f:mrow&gt;&lt;f:mo&gt;−&lt;/f:mo&gt;&lt;f:mn&gt;1&lt;/f:mn&gt;&lt;/f:mrow&gt;&lt;/f:msup&gt;&lt;/f:math&gt;: (i) Evaluating the structure factor of quasielastic magnetic intensity enables to identify uniquely longitudinal superparamagnetic spin fluctuations in the small &lt;g:math xmlns:g=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;g:mrow&gt;&lt;g:mi&gt;Q&lt;/g:mi&gt;&lt;/g:mrow&gt;&lt;/g:math&gt; regime &lt;h:math xmlns:h=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;h:mrow&gt;&lt;h:mo&gt;&lt;&lt;/h:mo&gt;&lt;h:mn&gt;0.5&lt;/h:mn&gt;&lt;h:msup&gt;&lt;h:mrow&gt;&lt;h:mrow&gt;&lt;h:mspace width=\"4.pt\"/&gt;&lt;h:mtext&gt;Å&lt;/h:mtext&gt;&lt;/h:mrow&gt;&lt;/h:mrow&gt;&lt;h:mrow&gt;&lt;h:mo&gt;−&lt;/h:mo&gt;&lt;h:mn&gt;1&lt;/h:mn&gt;&lt;/h:mrow&gt;&lt;/h:msup&gt;&lt;/h:mrow&gt;&lt;/h:math&gt;, (ii) individual spin relaxation with quasielastic intensity albeit of low intensity is present in two &lt;j:math xmlns:j=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;j:mrow&gt;&lt;j:mi&gt;Q&lt;/j:mi&gt;&lt;/j:mrow&gt;&lt;/j:math&gt; ranges of 0.5 &lt;k:math xmlns:k=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;k:mrow&gt;&lt;k:msup&gt;&lt;k:mrow&gt;&lt;k:mrow&gt;&lt;k:mspace width=\"4.pt\"/&gt;&lt;k:mtext&gt;Å&lt;/k:mtext&gt;&lt;/k:mrow&gt;&lt;/k:mrow&gt;&lt;k:mrow&gt;&lt;k:mo&gt;−&lt;/k:mo&gt;&lt;k:mn&gt;1&lt;/k:mn&gt;&lt;/k:mrow&gt;&lt;/k:msup&gt;&lt;k:mo&gt;&lt;&lt;/k:mo&gt;&lt;k:mi&gt;Q&lt;/k:mi&gt;&lt;k:mo&gt;&lt;&lt;/k:mo&gt;&lt;k:mn&gt;1.0&lt;/k:mn&gt;&lt;k:msup&gt;&lt;k:mrow&gt;&lt;k:mrow&gt;&lt;k:mspace width=\"4.pt\"/&gt;&lt;k:mtext&gt;Å&lt;/k:mtext&gt;&lt;/k:mrow&gt;&lt;/k:mrow&gt;&lt;k:mrow&gt;&lt;k:mo&gt;−&lt;/k:mo&gt;&lt;k:mn&gt;1&lt;/k:mn&gt;&lt;/k:mrow&gt;&lt;/k:msup&gt;&lt;/k:mrow&gt;&lt;/k:math&gt; and 1.5 &lt;n:math xmlns:n=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;n:mrow&gt;&lt;n:msup&gt;&lt;n:mrow&gt;&lt;n:mrow&gt;&lt;n:mspace width=\"4.pt\"/&gt;&lt;n:mtext&gt;Å&lt;/n:mtext&gt;&lt;/n:mrow&gt;&lt;/n:mrow&gt;&lt;n:mrow&gt;&lt;n:mo&gt;−&lt;/n:mo&gt;&lt;n:mn&gt;1&lt;/n:mn&gt;&lt;/n:mrow&gt;&lt;/n:msup&gt;&lt;n:mo&gt;&lt;&lt;/n:mo&gt;&lt;n:mi&gt;Q&lt;/n:mi&gt;&lt;n:mo&gt;&lt;&lt;/n:mo&gt;&lt;n:mn&gt;1.7&lt;/n:mn&gt;&lt;n:msup&gt;&lt;n:mrow&gt;&lt;n:mrow&gt;&lt;n:mspace width=\"4.pt\"/&gt;&lt;n:mtext&gt;Å&lt;/n:mtext&gt;&lt;/n:mrow&gt;&lt;/n:mrow&gt;&lt;n:mrow&gt;&lt;n:mo&gt;−&lt;/n:mo&gt;&lt;n:mn&gt;1&lt;/n:mn&gt;&lt;/n:mrow&gt;&lt;/n:msup&gt;&lt;/n:mrow&gt;&lt;/n:math&gt;, and (iii) a surprisingly low-energy inelastic spin excitation of 23.2 µeV in magnetite IONPs is found at 150 K in the magnetic Bragg region between 1.1 &lt;q:math xmlns:q=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;q:mrow&gt;&lt;q:msup&gt;&lt;q:mrow&gt;&lt;q:mi&gt;Å&lt;/q:mi&gt;&lt;/q:mrow&gt;&lt;q:mrow&gt;&lt;q:mo&gt;−&lt;/q:mo&gt;&lt;q:mn&gt;1&lt;/q:mn&gt;&lt;/q:mrow&gt;&lt;/q:msup&gt;&lt;q:mo&gt;&lt;&lt;/q:mo&gt;&lt;q:mi&gt;Q&lt;/q:mi&gt;&lt;q:mo&gt;&lt;&lt;/q:mo&gt;&lt;q:mn&gt;1.4&lt;/q:mn&gt;&lt;q:msup&gt;&lt;q:mrow&gt;&lt;q:mrow&gt;&lt;q:mspace width=\"4.pt\"/&gt;&lt;q:mtext&gt;Å&lt;/q:mtext&gt;&lt;/q:mrow&gt;&lt;/q:mrow&gt;&lt;q:mrow&gt;&lt;q:mo&gt;−&lt;/q:mo&gt;&lt;q:mn&gt;1&lt;/q:mn&gt;&lt;/q:mrow&gt;&lt;/q:msup&gt;&lt;/q:mrow&gt;&lt;/q:math&gt;. Its temperature dependence suggests a collapse of the coherent transverse magnetic f","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":"2 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143393525","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Electron irradiation effects on monolayer MoS2 at elevated temperatures","authors":"Carsten Speckmann, Kimmo Mustonen, Diana Propst, Clemens Mangler, Jani Kotakoski","doi":"10.1103/physrevb.111.054107","DOIUrl":"https://doi.org/10.1103/physrevb.111.054107","url":null,"abstract":"The effect of electron irradiation on two-dimensional (2D) materials is an important topic, both for the correct interpretation of electron microscopy experiments and for possible applications in electron lithography. After the importance of including inelastic scattering damage in theoretical models describing beam damage and the lack of oxygen sensitivity under electron irradiation in 2D MoS</a:mi>2</a:mn></a:msub></a:math> were recently shown, the role of temperature has remained unexplored on a quantitative level. Here we show the effect of temperature on the creation of individual defects and the effect of temperature on defect dynamics. Based on the measured displacement cross section of sulfur atoms in <b:math xmlns:b=\"http://www.w3.org/1998/Math/MathML\"><b:msub><b:mi>MoS</b:mi><b:mn>2</b:mn></b:msub></b:math> by atomic resolution scanning transmission electron microscopy, we find an increased probability for defect creation for temperatures up to <c:math xmlns:c=\"http://www.w3.org/1998/Math/MathML\"><c:mrow><c:mn>150</c:mn><c:msup><c:mspace width=\"0.16em\"/><c:mo>∘</c:mo></c:msup><c:mi mathvariant=\"normal\">C</c:mi></c:mrow></c:math>, in accordance with theoretical predictions. However, higher temperatures lead to a decrease of the observed cross sections. Despite this apparent decrease, we find that the elevated temperature does not mitigate the creation of defects as this observation would suggest, but rather hides the created damage due to rapid thermal diffusion of the created vacancies before their detection, leading to the formation of vacancy lines and pores outside the measurement's field of view. Using the experimental data in combination with previously reported theoretical models for the displacement cross section, we estimate the migration energy barrier of sulfur vacancies in <f:math xmlns:f=\"http://www.w3.org/1998/Math/MathML\"><f:msub><f:mi>MoS</f:mi><f:mn>2</f:mn></f:msub></f:math> to be <g:math xmlns:g=\"http://www.w3.org/1998/Math/MathML\"><g:mrow><g:mn>0.26</g:mn><g:mo>±</g:mo><g:mn>0.13</g:mn><g:mspace width=\"0.16em\"/><g:mi>eV</g:mi></g:mrow></g:math>. These results mark another step towards the complete understanding of electron beam damage in <i:math xmlns:i=\"http://www.w3.org/1998/Math/MathML\"><i:msub><i:mi>MoS</i:mi><i:mn>2</i:mn></i:msub></i:math>. <jats:supplementary-material> <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement> <jats:copyright-year>2025</jats:copyright-year> </jats:permissions> </jats:supplementary-material>","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":"47 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143385317","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Magnetic properties of the zigzag ladder compound SrTb2O4","authors":"F. Orlandi, M. Ciomaga Hatnean, D. A. Mayoh, J. P. Tidey, S. X. M. Riberolles, G. Balakrishnan, P. Manuel, D. D. Khalyavin, H. C. Walker, M. D. Le, B. Ouladdiaf, A. R. Wildes, N. Qureshi, O. A. Petrenko","doi":"10.1103/physrevb.111.054415","DOIUrl":"https://doi.org/10.1103/physrevb.111.054415","url":null,"abstract":"We report on the properties of SrTb</a:mi>2</a:mn></a:msub>O</a:mi>4</a:mn></a:msub></a:mrow></a:math>, a frustrated zigzag ladder antiferromagnet, studied by single crystal neutron diffraction (with polarized neutrons in zero field and unpolarized neutrons in an applied magnetic field), as well as by neutron spectroscopy on a polycrystalline sample. The neutron scattering results are supported by single-crystal magnetization and heat capacity measurements. In zero field, neutron diffraction data show no transition to a magnetically ordered state down to the lowest experimentally available temperature of 35 mK, and the material remains magnetically disordered down to this temperature. Polarized neutron diffraction measurements reveal the presence of a diffuse scattering signal suggesting only very weak spin-spin correlations in the ground state. For <c:math xmlns:c=\"http://www.w3.org/1998/Math/MathML\"><c:mrow><c:mi>H</c:mi><c:mo>∥</c:mo><c:mi>c</c:mi></c:mrow></c:math> (the easy magnetization direction), we followed the magnetization process using neutron diffraction measurements and observed the appearance of field-induced magnetic Bragg peaks with integer <d:math xmlns:d=\"http://www.w3.org/1998/Math/MathML\"><d:mi>h</d:mi></d:math> and <e:math xmlns:e=\"http://www.w3.org/1998/Math/MathML\"><e:mi>k</e:mi></e:math> indices in the <f:math xmlns:f=\"http://www.w3.org/1998/Math/MathML\"><f:mrow><f:mo>(</f:mo><f:mi>h</f:mi><f:mi>k</f:mi><f:mn>0</f:mn><f:mo>)</f:mo></f:mrow></f:math> scattering plane. No magnetic peaks with a nonzero propagation vector were detected. The observed in-field data fit well to a simple two-sublattice model with magnetic moments aligned along the field direction but being significantly different in magnitude for the two inequivalent <g:math xmlns:g=\"http://www.w3.org/1998/Math/MathML\"><g:msup><g:mrow><g:mi>Tb</g:mi></g:mrow><g:mrow><g:mn>3</g:mn><g:mo>+</g:mo></g:mrow></g:msup></g:math> sites in the unit cell. Overall, the collected data point to a nonmagnetic ground state in <h:math xmlns:h=\"http://www.w3.org/1998/Math/MathML\"><h:mrow><h:msub><h:mi>SrTb</h:mi><h:mn>2</h:mn></h:msub><h:msub><h:mi mathvariant=\"normal\">O</h:mi><h:mn>4</h:mn></h:msub></h:mrow></h:math> despite the presence of strong interactions. <jats:supplementary-material> <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement> <jats:copyright-year>2025</jats:copyright-year> </jats:permissions> </jats:supplementary-material>","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":"55 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143385316","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Berry phase effects on the transverse conductivity of Fermi surfaces and their detection via spin qubit noise magnetometry","authors":"Mark Morgenthaler, Inti Sodemann Villadiego","doi":"10.1103/physrevb.111.075406","DOIUrl":"https://doi.org/10.1103/physrevb.111.075406","url":null,"abstract":"The quasistatic transverse conductivity of clean Fermi liquids at long wavelengths displays a remarkably universal behavior: it is determined solely by the radius of curvature of the Fermi surface and does not depend on details such as the quasiparticle mass or their interactions. Here we demonstrate that Berry phases do not alter such universality by directly computing the transverse conductivity of two-dimensional electronic systems with Dirac dispersions, such as those appearing in graphene and its chiral multilayer variants. Interestingly, however, such universality ceases to hold at wave vectors comparable to the Fermi radius, where Dirac fermions display a vividly distinct transverse conductivity relative to parabolic Fermions, with a rich wave vector dependence that includes divergences, oscillations, and zeros. We discuss how this can be probed by measuring the T</a:mi>1</a:mn></a:msub></a:math> relaxation time of spin qubits, such as NV centers or nuclear spins, placed near such 2D systems. <jats:supplementary-material> <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement> <jats:copyright-year>2025</jats:copyright-year> </jats:permissions> </jats:supplementary-material>","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":"13 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143258156","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Theory of terahertz-driven magnetic switching in rare-earth orthoferrites: The case of TmFeO3","authors":"N. R. Vovk, E. V. Ezerskaya, R. V. Mikhaylovskiy","doi":"10.1103/physrevb.111.064411","DOIUrl":"https://doi.org/10.1103/physrevb.111.064411","url":null,"abstract":"We report a theoretical formalism that describes a dynamic magnetic response of rare-earth orthoferrites, particularly those with non-Kramers rare-earth () ions, when driven by strong terahertz fields. We derive a total thermodynamic potential for the exchange coupled -Fe system by constructing an effective Hamiltonian and employing a mean-field theory approximation. We investigate static properties of the and Fe subsystems across the spin-reorientation phase transitions and obtain resonance frequencies for Fe and magnetic sublattices as a function of temperature. Taking an example of the archetypical orthoferrite TmFe</a:mi>O</a:mi>3</a:mn></a:msub></a:mrow></a:math>, we perform numerical modeling to accurately describe the behavior of its anisotropy functions vs temperature. Finally, we analyze switching dynamics of Fe spins and nonlinear effects in the subsystem of <c:math xmlns:c=\"http://www.w3.org/1998/Math/MathML\"><c:mrow><c:mi>TmFe</c:mi><c:msub><c:mi mathvariant=\"normal\">O</c:mi><c:mn>3</c:mn></c:msub></c:mrow></c:math> driven by strong terahertz radiation. <jats:supplementary-material> <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement> <jats:copyright-year>2025</jats:copyright-year> </jats:permissions> </jats:supplementary-material>","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":"40 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143258023","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Unoccupied electronic states of Fe3O4 (100): An angle-resolved inverse-photoemission study","authors":"Jan Bieling, Markus Donath","doi":"10.1103/physrevb.111.075117","DOIUrl":"https://doi.org/10.1103/physrevb.111.075117","url":null,"abstract":"We present an experimental study that offers first insights into the unoccupied electronic states of a pristine (</a:mo>2</a:mn></a:msqrt>×</a:mo>2</a:mn></a:msqrt>)</a:mo></a:mrow>R</a:mtext>45</a:mn>∘</a:mo></a:msup></a:mrow></a:math> reconstructed <c:math xmlns:c=\"http://www.w3.org/1998/Math/MathML\"><c:mrow><c:msub><c:mi>Fe</c:mi><c:mn>3</c:mn></c:msub><c:msub><c:mi mathvariant=\"normal\">O</c:mi><c:mn>4</c:mn></c:msub></c:mrow></c:math>(100) surface. We initially demonstrate the successful sample preparation by analyzing the surface periodicity and chemical composition by low-energy electron diffraction and Auger electron spectroscopy, respectively. Using angle-resolved inverse photoemission, we study the unoccupied electronic states. We observe three nondispersive emissions, one dominant feature around <e:math xmlns:e=\"http://www.w3.org/1998/Math/MathML\"><e:mrow><e:mn>2</e:mn><e:mspace width=\"0.16em\"/><e:mi>eV</e:mi></e:mrow></e:math> above the Fermi level and two additional ones at higher energies. For the low-lying triple-split feature, we propose two possible interpretations based on former theoretical studies. We either ascribe it to <g:math xmlns:g=\"http://www.w3.org/1998/Math/MathML\"><g:mn>3</g:mn><g:mi>d</g:mi></g:math>-related bandgroups originating from tetrahedrally and octahedrally coordinated bulk iron atoms or attribute it to a mixture of <h:math xmlns:h=\"http://www.w3.org/1998/Math/MathML\"><h:mn>3</h:mn><h:mi>d</h:mi></h:math> states originating from octahedrally coordinated iron atoms within the bulk and the reconstructed surface layer. The high-lying features are ascribed to bulk bands based on the experimentally observed characteristics. <jats:supplementary-material> <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement> <jats:copyright-year>2025</jats:copyright-year> </jats:permissions> </jats:supplementary-material>","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":"20 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143258157","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Diffusion in liquid metals is directed by competing collective modes","authors":"Franz Demmel, Noel Jakse","doi":"10.1103/physrevb.111.l081104","DOIUrl":"https://doi.org/10.1103/physrevb.111.l081104","url":null,"abstract":"The self-diffusion process in a dense liquid is influenced by collective particle movements. Extensive molecular dynamics simulations for liquid aluminium and rubidium evidence a crossover in the diffusion coefficient at about 1.4 times the melting temperature T</a:mi>m</a:mi></a:msub></a:math>, indicating a profound change in the diffusion mechanism. The corresponding velocity autocorrelation functions demonstrate a decrease of the cage effect with a gradual set in of a power-law decay, they celebrate long time tail. This behavior is caused by a competition of density fluctuations near the melting point with vortex-type particle patterns from transverse currents in the hot fluid. The investigation of the velocity autocorrelation function evidences a gradual transition in dynamics with rising temperature. The competition between these two collective particle movements, one hindering and one enhancing the diffusion process, leads to a non-Arrhenius-type behavior of the diffusion coefficient around <b:math xmlns:b=\"http://www.w3.org/1998/Math/MathML\"><b:mrow><b:mn>1.4</b:mn><b:mspace width=\"0.16em\"/><b:msub><b:mi>T</b:mi><b:mi>m</b:mi></b:msub></b:mrow></b:math>, which signals the transition from a dense to a fluidlike liquid dynamics in the potential energy landscape picture. <jats:supplementary-material> <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement> <jats:copyright-year>2025</jats:copyright-year> </jats:permissions> </jats:supplementary-material>","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":"140 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143258025","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}