arXiv - PHYS - Strongly Correlated Electrons最新文献_第8页

Multicomponent magneto-orbital order and magneto-orbitons in monolayer VCl3 单层 VCl3 中的多分量磁轨道秩序和磁轨道子

arXiv - PHYS - Strongly Correlated Electrons Pub Date : 2024-09-08 DOI: arxiv-2409.05056

Luigi Camerano, Adolfo O. Fumega, Gianni Profeta, Jose L. Lado

引用次数: 0

Physical properties of the ferromagnetic quantum critical system YbNi$_4$(P$_{1-x}$As$_{x}$)$_2$ 铁磁量子临界系统 YbNi$_4$(P$_{1-x}$As$_{x}$)$_2$ 的物理特性

arXiv - PHYS - Strongly Correlated Electrons Pub Date : 2024-09-08 DOI: arxiv-2409.05150

Kristin Kliemt, Jacintha Banda, Pavlo Khanenko, Ali Scherzad, Ulrike Stockert, Anna Efimenko, Kurt Kummer, Cornelius Krellner, Manuel Brando

{"title":"Physical properties of the ferromagnetic quantum critical system YbNi$_4$(P$_{1-x}$As$_{x}$)$_2$","authors":"Kristin Kliemt, Jacintha Banda, Pavlo Khanenko, Ali Scherzad, Ulrike Stockert, Anna Efimenko, Kurt Kummer, Cornelius Krellner, Manuel Brando","doi":"arxiv-2409.05150","DOIUrl":"https://doi.org/arxiv-2409.05150","url":null,"abstract":"We report on single crystal growth and physical properties of the quantum\u0000critical Kondo-lattice system YbNi$_4$(P$_{1-x}$As$_{x}$)$_2$ with $0leq xleq\u00001$ which hosts a ferromagnetic quantum critical point at $x approx 0.1$. We\u0000performed measurements of the magnetization, electrical resistivity,\u0000thermopower, heat capacity, and resonant X-ray emission spectroscopy. Arsenic\u0000substitution leads to a homogeneous increase of the unit-cell volume, with\u0000well-defined As-concentrations in large parts of the single crystals. All data\u0000consistently show that with increasing $x$ the Kondo temperature increases,\u0000while the magnetic anisotropy observed at low $x$ fully vanishes towards $x=1$.\u0000Consequently, at low temperatures, the system shows a crossover from pronounced\u0000non-Fermi liquid behaviour for $x leq 0.2$ to a Fermi liquid behavior for $x >\u00000.2$ with weak correlations. There is a continuous change in Yb valence from\u0000nearly trivalent at low $x$ to a slightly lower value for $x = 0.6$, which\u0000correlates with the Kondo temperature. Interestingly, specific heat\u0000measurements at very low temperatures show that $C/T$ strongly increases\u0000towards lower $T$ for $x = 0.13$ and $x = 0.2$ with a very similar power law.\u0000This suggests that in YbNi$_4$(P$_{1-x}$As$_{x}$)$_2$ a quantum critical region\u0000rather than a quantum critical point might exist.","PeriodicalId":501171,"journal":{"name":"arXiv - PHYS - Strongly Correlated Electrons","volume":"9 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142180470","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Multi-mode Coulomb blockade oscillations 多模式库仑封锁振荡

arXiv - PHYS - Strongly Correlated Electrons Pub Date : 2024-09-08 DOI: arxiv-2409.05218

D. B. Karki

引用次数: 0

Edge-driven transition between extended quantum anomalous Hall crystal and fractional Chern insulator in rhombohedral graphene multilayers 斜方体石墨烯多层膜中扩展量子反常霍尔晶体与分数切尔恩绝缘体之间的边缘驱动转变

arXiv - PHYS - Strongly Correlated Electrons Pub Date : 2024-09-08 DOI: arxiv-2409.05043

Zezhu Wei, Ang-Kun Wu, Miguel Gonçalves, Shi-Zeng Lin

{"title":"Edge-driven transition between extended quantum anomalous Hall crystal and fractional Chern insulator in rhombohedral graphene multilayers","authors":"Zezhu Wei, Ang-Kun Wu, Miguel Gonçalves, Shi-Zeng Lin","doi":"arxiv-2409.05043","DOIUrl":"https://doi.org/arxiv-2409.05043","url":null,"abstract":"Fractional Chern insulators (FCI) with fractionally quantized Hall\u0000conductance at fractional fillings and an extended quantum anomalous Hall\u0000(EQAH) crystal with an integer quantized Hall conductance over an extended\u0000region of doping were recently observed in pentalayer graphene. One\u0000particularly puzzling observation is the transition between the EQAH and FCI\u0000regimes, driven either by temperature or electrical current. Here we propose a\u0000scenario to understand these transitions based on the topologically protected\u0000gapless edge modes that are present in both the FCI and EQAH phases and should\u0000be most relevant at temperature scales below the energy gap. Our consideration\u0000is based on the simple assumption that the edge velocity in FCI is smaller than\u0000that in EQAHE and thus contributes to a higher entropy. We further argue that\u0000domains with opposite fractionally quantized Hall conductance are ubiquitous in\u0000the devices due to disorder, which gives rise to a network of edge modes. The\u0000velocity of the edge modes between domains is further reduced due to edge\u0000reconstruction. The edge velocity can also be reduced by current when the\u0000occupation of the edge mode approaches the gap edge. The edge entropy therefore\u0000drives the transition from EQAH to FCI either by temperature or current at a\u0000nonzero temperature.","PeriodicalId":501171,"journal":{"name":"arXiv - PHYS - Strongly Correlated Electrons","volume":"54 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142180528","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Floquet dynamical chiral spin liquid at finite frequency 有限频率下的 Floquet 动力手性自旋液体

arXiv - PHYS - Strongly Correlated Electrons Pub Date : 2024-09-07 DOI: arxiv-2409.04892

Didier Poilblanc, Matthieu Mambrini, Nathan Goldman

{"title":"Floquet dynamical chiral spin liquid at finite frequency","authors":"Didier Poilblanc, Matthieu Mambrini, Nathan Goldman","doi":"arxiv-2409.04892","DOIUrl":"https://doi.org/arxiv-2409.04892","url":null,"abstract":"Chiral Spin Liquids (CSL) are quantum spin analogs of electronic Fractional\u0000Chern Insulators. Their realizations on ultracold-atom or Rydberg-atom\u0000platforms remain very challenging. Recently, a setup of time-periodic\u0000modulations of nearest-neighbor Heisenberg couplings applied on an initial\u0000genuine spin liquid state on the square lattice has been proposed to stabilize\u0000a (Abelian) $mathbb{Z}_2$ CSL phase. In the high-frequency limit, it was shown\u0000that time evolution can be described in terms of a static effective chiral\u0000Hamiltonian. Here we revisit this proposal and consider drives at lower\u0000frequency in a regime where the high-frequency Magnus expansion fails. We show\u0000that a Dynamical CSL (DCSL) is nevertheless stabilized in a finite range of\u0000frequency. The topological nature of this dynamical phase, as well as its\u0000instability below a critical frequency, is connected to specific features of\u0000the Floquet pseudo-energy spectrum. We also show that the DCSL can be\u0000represented faithfully by a two-dimensional time-periodic tensor network and,\u0000as in the static case, topological order is associated to a tensor gauge\u0000symmetry ($mathbb{Z}_2$ in that case).","PeriodicalId":501171,"journal":{"name":"arXiv - PHYS - Strongly Correlated Electrons","volume":"33 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142180583","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Charge ordering and spontaneous topological Hall effect in bilayer skyrmion crystals 双层锡兰晶体中的电荷有序和自发拓扑霍尔效应

arXiv - PHYS - Strongly Correlated Electrons Pub Date : 2024-09-06 DOI: arxiv-2409.04520

Andrew Hardy, Anjishnu Bose, Tanmay Grover, Arun Paramekanti

{"title":"Charge ordering and spontaneous topological Hall effect in bilayer skyrmion crystals","authors":"Andrew Hardy, Anjishnu Bose, Tanmay Grover, Arun Paramekanti","doi":"arxiv-2409.04520","DOIUrl":"https://doi.org/arxiv-2409.04520","url":null,"abstract":"Magnetic skyrmion crystals with zero net skyrmion charge and zero topological\u0000Hall response are interesting candidate phases which can occur at a vanishing\u0000magnetic field in centrosymmetric systems. We study a minimal bilayer model of\u0000skyrmion crystals having opposite chirality and topological charge in the two\u0000layers, and show that it can host nearly flat electronic bands with\u0000quasi-uniform Berry curvature and quantum metric. Using Hartree-Fock theory, we\u0000show that weak to moderate short-range electron interactions induce two\u0000distinct types of symmetry breaking patterns depending on the band dispersion:\u0000an intra-unit-cell charge density modulation from Chern band mixing or a\u0000layer-imbalanced phase with a nonzero ferroelectric polarization. Both phases\u0000break inversion symmetry leading to a spontaneous and large net topological\u0000Hall effect, with the phase diagram tunable by external electric fields. Our\u0000results may be relevant to centrosymmetric skyrmion materials such as\u0000Gd$_2$PdSi$_3$ and Gd$_3$Ru$_4$Al$_{12}$ as well as artificially engineered\u0000heterostructures. We also discuss its relation to recent work on twisted\u0000transition metal dichalcogenide bilayers.","PeriodicalId":501171,"journal":{"name":"arXiv - PHYS - Strongly Correlated Electrons","volume":"59 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142180586","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Magnetic properties of LiCu$_3$O$_3$ -- quasi-two-dimensional antiferromagnet on depleted square lattice 贫化方格上准二维反铁磁体 LiCu$_3$O$_3$ 的磁特性

arXiv - PHYS - Strongly Correlated Electrons Pub Date : 2024-09-06 DOI: arxiv-2409.04213

A. A. Bush, S. K. Gotovko, V. Yu. Ivanov, V. I. Kozlov, E. G. Nikolaev, L. E. Svistov

{"title":"Magnetic properties of LiCu$_3$O$_3$ -- quasi-two-dimensional antiferromagnet on depleted square lattice","authors":"A. A. Bush, S. K. Gotovko, V. Yu. Ivanov, V. I. Kozlov, E. G. Nikolaev, L. E. Svistov","doi":"arxiv-2409.04213","DOIUrl":"https://doi.org/arxiv-2409.04213","url":null,"abstract":"LiCu$_3$O$_3$ is a novel 2D S=1/2 antiferromagnet with randomly depleted\u0000square lattice. The crystal structure contains two types of square planes with\u0000different Cu$^{2+}rightarrow$ Li$^{+}$ substitution rates (20% and 40%).\u0000$^7$Li NMR and magnetization measurements performed on single crystals of\u0000LiCu$_3$O$_3$ revealed the occurrence of magnetic order at $T_{c1}=123$ K and\u0000the change of the magnetic state at $T_{c2}approx30$ K. The high temperature\u0000transition can be attributed to establishment of magnetic order in planes with\u0000higher concentration of magnetic ions and the low temperature transition -- to\u0000the magnetic ordering in planes with lower concentration of magnetic ions.\u0000Broad continuous NMR spectra below $T_{c1}$ reflect a continuous distribution\u0000of values or directions of magnetic moments in LiCu$_3$O$_3$ typical for\u0000spiral, spin-modulated magnetic structures or structures with frozen disorder.\u0000Magnetization measurements revealed a spin-flop transition which indicates weak\u0000uniaxial anisotropy of the spin structure. Relatively small value of magnetic\u0000susceptibility at all orientations of applied magnetic field shows that\u0000magnetic structure is rigid, since the estimated value of saturation field\u0000derived from differential susceptibility measured at $mu_0 H=5$ T is\u0000$mu_0H_{sat} approx$200 T.","PeriodicalId":501171,"journal":{"name":"arXiv - PHYS - Strongly Correlated Electrons","volume":"65 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142180523","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Quantum Critical Behavior in Ce-Au-Al Quasicrystal Approximants Ce-Au-Al 准晶近似物中的量子临界行为

arXiv - PHYS - Strongly Correlated Electrons Pub Date : 2024-09-06 DOI: arxiv-2409.04279

A. Khansili, Y. -C. Huang, U. Häussermann, C. Pay Gomez, A. Rydh

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Topological excitons in moiré MoTe$_2$/WSe$_2$ heterobilayers MoTe$_2$/WSe$_2$ 异质层中的拓扑激元

arXiv - PHYS - Strongly Correlated Electrons Pub Date : 2024-09-06 DOI: arxiv-2409.04371

Paul Froese, Titus Neupert, Glenn Wagner

引用次数: 0

Evidence for spin droplets (ferrons) formation in the heavy fermion metal CeB$_6$ with dynamic charge stripes 具有动态电荷条纹的重费米子金属 CeB$_6$ 中形成自旋液滴（铁氧体）的证据

arXiv - PHYS - Strongly Correlated Electrons Pub Date : 2024-09-06 DOI: arxiv-2409.04139

A. N. Azarevich, O. N. Khrykina, N. B. Bolotina, V. G. Gridchina, A. V. Bogach, S. V. Demishev, V. N. Krasnorussky, S. Yu. Gavrilkin, A. Yu. Tsvetkov, N. Yu. Shitsevalova, V. V. Voronov, K. I. Kugel, A. L. Rakhmanov, S. Gabani, K. Flachbart, N. E. Sluchanko

{"title":"Evidence for spin droplets (ferrons) formation in the heavy fermion metal CeB$_6$ with dynamic charge stripes","authors":"A. N. Azarevich, O. N. Khrykina, N. B. Bolotina, V. G. Gridchina, A. V. Bogach, S. V. Demishev, V. N. Krasnorussky, S. Yu. Gavrilkin, A. Yu. Tsvetkov, N. Yu. Shitsevalova, V. V. Voronov, K. I. Kugel, A. L. Rakhmanov, S. Gabani, K. Flachbart, N. E. Sluchanko","doi":"arxiv-2409.04139","DOIUrl":"https://doi.org/arxiv-2409.04139","url":null,"abstract":"The presented studies of resistivity (R), thermal conductivity (k) and\u0000specific heat (C) at low temperature 1.8-7 K in magnetic field up to 90 kOe\u0000made it possible to detect for the first time the exponential field dependences\u0000R(H), 1/k(H), $C(H) sim exp(-{mu}_{rm eff}H/kBT)$ of the charge transport\u0000and thermal characteristics in the so-called antiferroquadrupole (AFQ) phase of\u0000the archetypal heavy-fermion CeB$_6$ hexaboride. From magnetoresistance\u0000measurements it is shown that in the AFQ state the effective magnetic moment\u0000varies in the range ${mu}_{rm eff}(T) = 1.4$-1.9$mu$B, and its value is very\u0000close to ${mu}_{rm eff}(tau)(T) = 2{mu}$B, derived from the field\u0000dependence of the relaxation time $|tau(H)$ observed in the heat capacity and\u0000thermal conductivity experiments. The phenomenological model proposed here\u0000allowed us to attribute the magnetic moments to spin droplets (ferrons), that\u0000appear in the bulk AFQ phase of CeB$_6$ crystals. The relevant electron phase\u0000separation at the nanoscale, manifested by dynamic charge stripes, that leads\u0000to the formation of ferrons, was revealed from the analysis of low-temperature\u0000X-ray diffraction experiments using the maximum entropy method. We argue that\u0000the Jahn-Teller collective mode of B$_6$ clusters is responsible for the charge\u0000stripe formation, which subsequently induces transverse quasi-local vibrations\u0000of Ce ions in the form of pairs and triples. These lead to 4f-5d spin\u0000fluctuations providing spin-polarons (ferrons) in the CeB$_6$ matrix.","PeriodicalId":501171,"journal":{"name":"arXiv - PHYS - Strongly Correlated Electrons","volume":"115 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142180526","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0