物理与天体物理最新文献

{"title":"Mixed-configuration approximation for multiorbital systems out of equilibrium","authors":"Tommaso Maria Mazzocchi, Daniel Werner, Markus Aichhorn, Enrico Arrigoni","doi":"10.1103/j3c8-cy15","DOIUrl":"https://doi.org/10.1103/j3c8-cy15","url":null,"abstract":"We propose a mixed-configuration approximation based on single-band impurity solvers to efficiently study nonequilibrium multiorbital systems at moderate computational cost. In this work, we merge the approach with the so-called auxiliary master equation approach. As a benchmark, we first show that our approach reproduces the results of quantum Monte Carlo (QMC) for two-orbital impurity models at equilibrium with overall good accuracy, especially for nondegenerate orbitals. We then use our approach as an impurity solver for dynamical mean-field theory (DMFT) to address the case of a two-orbital, realistic layered structure, recovering the strong crystal-field-driven charge polarization observed by solving the DMFT self-consistent cycle with QMC, albeit slightly reduced. Finally, we address a prototype nonequilibrium setup by sandwiching this layer between metallic contacts subject to a bias voltage described by different chemical potentials. This simplified model demonstrates our method's potential to access nonequilibrium steady-state behavior of multiorbital, realistic materials. These findings provide a first-step basis for theoretical studies of nonequilibrium properties of multiorbital compounds directly in the real frequency domain.","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":"19 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145260670","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":"Screening of the band gap in electrically biased bilayer graphene: From Hartree to Hartree-Fock","authors":"Jack N. Engdahl, Zeb E. Krix, Oleg P. Sushkov","doi":"10.1103/2pdw-n1tt","DOIUrl":"https://doi.org/10.1103/2pdw-n1tt","url":null,"abstract":"","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":"18 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145260678","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":"Raman signature of multiple phase transitions and quasiparticle excitations in the putative Kitaev spin liquid candidate Na2Co2TeO6","authors":"Atul G. Chakkar, Chaitanya B. Auti, Deepu Kumar, Nirmalya Jana, Koushik Pal, Pradeep Kumar","doi":"10.1103/z71t-pbcc","DOIUrl":"https://doi.org/10.1103/z71t-pbcc","url":null,"abstract":"","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":"71 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145260679","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":"Evaluation of the real-space second Chern number using the kernel polynomial method","authors":"Rui Chen, Bin Zhou","doi":"10.1103/yksf-1l8m","DOIUrl":"https://doi.org/10.1103/yksf-1l8m","url":null,"abstract":"","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":"71 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2025-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145260683","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":"Superconducting spintronic device based on Fe3GaTe2/CsV3Sb5/Fe3GaTe2 van der Waals heterojunctions","authors":"Jing Kong, Heshuang Wei, Jinyu Duan, Yuanyu Song, Gaomeng Hou, Pengfei Liu, Ping Wang, Delin Zhang, Yong Jiang","doi":"10.1063/5.0272896","DOIUrl":"https://doi.org/10.1063/5.0272896","url":null,"abstract":"van der Waals (vdW) heterojunctions have emerged as highly promising candidates for next-generation spintronic devices, owing to their exceptional interface quality, scalability, and tunable electronic properties. Here, we report a vdW superconducting heterojunction based on the Fe3GaTe2/CsV3Sb5/Fe3GaTe2, which combines the strong perpendicular magnetic anisotropy of Fe3GaTe2 with the superconductivity and charge density wave order of the Kagome metal CsV3Sb5. Notably, this superconducting heterojunction exhibits a magnetoresistance of 0.25% at 2 K, approximately two times higher than that observed at elevated temperatures. The magnetic proximity effect in CsV3Sb5 modulates superconductivity by suppressing spin-singlet Cooper pairing and enabling spin-triplet states. The interplay between magnetism and superconductivity not only elucidates the coexistence of competing electronic orders in CsV3Sb5 but also highlights the potential of such heterojunctions for energy-efficient, high-performance spintronic devices. Our work establishes Fe3GaTe2/CsV3Sb5/Fe3GaTe2 as a promising platform for engineering spin-polarized superconducting states and advancing quantum computing technologies.","PeriodicalId":8094,"journal":{"name":"Applied Physics Letters","volume":"18 1","pages":""},"PeriodicalIF":4.0,"publicationDate":"2025-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145260722","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":"Probing how bright the quark-gluon plasma glows in lattice QCD","authors":"Ardit Krasniqi, Marco Cè, Tim Harris, Renwick J. Hudspith, Harvey B. Meyer","doi":"10.1103/8dq9-q62p","DOIUrl":"https://doi.org/10.1103/8dq9-q62p","url":null,"abstract":"Determining the spectrum of photons emitted by the quark-gluon plasma nonperturbatively remains an open computational challenge. In this paper, we calculate two moments of that spectrum at a tem-perature T</a:mi>≈</a:mo>254</a:mn></a:mtext></a:mtext>MeV</a:mi></a:math>, employing lattice QCD with two flavors of <c:math xmlns:c=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><c:mi mathvariant=\"script\">O</c:mi><c:mo stretchy=\"false\">(</c:mo><c:mi>a</c:mi><c:mo stretchy=\"false\">)</c:mo></c:math>-improved Wilson fermions, without facing an inverse problem. Our central value for the difference of these two moments, which is sensitive to photon energies <h:math xmlns:h=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><h:mi>ω</h:mi><h:mo>≳</h:mo><h:mi>π</h:mi><h:mi>T</h:mi></h:math>, is lower than, but compatible with that obtained by integrating the leading-order weak-coupling photon spectrum. This study informs the “direct photon puzzle” in heavy-ion collision phenomenology, where it has proved difficult to simultaneously explain the yield and azimuthal anisotropy of photons not originating from final-state hadronic decays.","PeriodicalId":20167,"journal":{"name":"Physical Review D","volume":"72 1","pages":""},"PeriodicalIF":5.0,"publicationDate":"2025-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145260763","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-dependent scattering of sub-GeV dark matter: Models and constraints","authors":"Stefania Gori, Simon Knapen, Tongyan Lin, Pankaj Munbodh, Bethany Suter","doi":"10.1103/1r9r-n4sv","DOIUrl":"https://doi.org/10.1103/1r9r-n4sv","url":null,"abstract":"We calculate the scattering rate of sub-GeV dark matter in solid-state targets for spin-dependent dark matter–nucleon interactions. For dark matter particles with mass below 100 MeV, the scattering occurs predominantly through incoherent phonon production. For dark matter heavier than 100 MeV, we match onto the nuclear recoil calculation. To compare the sensitivity of future direct detection experiments with existing constraints, we consider three models with interactions that are mediated by spin-0 or spin-1 particles. This allows us to derive bounds on the cross section from searches for the mediating particle, including bounds from stellar cooling, beam dump experiments, meson factories, and dark matter self-interactions. The existing bounds are very stringent, though for m</a:mi>χ</a:mi></a:msub>≳</a:mo>100</a:mn></a:mtext></a:mtext>MeV</a:mi></a:math> there is parameter space, which may be accessible with direct detection, depending on the exposure and background rates.","PeriodicalId":20167,"journal":{"name":"Physical Review D","volume":"338 1","pages":""},"PeriodicalIF":5.0,"publicationDate":"2025-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145260795","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":"Black hole transitions, AdS spacetime, and the distance conjecture","authors":"Alvaro Herráez, Dieter Lüst, Carmine Montella","doi":"10.1103/6c4j-dp9v","DOIUrl":"https://doi.org/10.1103/6c4j-dp9v","url":null,"abstract":"In this work, we investigate the connection between black hole instabilities and Swampland constraints, presenting new insights into the anti–de Sitter (AdS) distance conjecture. By examining the scale at which horizon instabilities of Schwarzschild-AdS</a:mi>d</a:mi></a:msub></a:math> black holes take place—<c:math xmlns:c=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><c:msub><c:mi mathvariant=\"normal\">Λ</c:mi><c:mrow><c:mi>BH</c:mi></c:mrow></c:msub></c:math>—we uncover a universal scaling relation, <f:math xmlns:f=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><f:msub><f:mi mathvariant=\"normal\">Λ</f:mi><f:mrow><f:mi>BH</f:mi></f:mrow></f:msub><f:mo>∼</f:mo><f:mo stretchy=\"false\">|</f:mo><f:msub><f:mi mathvariant=\"normal\">Λ</f:mi><f:mi>AdS</f:mi></f:msub><f:msup><f:mo stretchy=\"false\">|</f:mo><f:mi>α</f:mi></f:msup></f:math>, with <l:math xmlns:l=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><l:mfrac><l:mn>1</l:mn><l:mi>d</l:mi></l:mfrac><l:mo>≤</l:mo><l:mi>α</l:mi><l:mo>≤</l:mo><l:mfrac><l:mn>1</l:mn><l:mn>2</l:mn></l:mfrac></l:math>, linking the emergence of towers of states directly to instability scales as <n:math xmlns:n=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><n:msub><n:mi mathvariant=\"normal\">Λ</n:mi><n:mi>AdS</n:mi></n:msub><n:mo stretchy=\"false\">→</n:mo><n:mn>0</n:mn></n:math>. This approach circumvents the explicit dependence on field-space distances, offering a refined formulation of the AdS distance conjecture grounded in physical black hole scales. From a top-down perspective, we find that these instability scales correspond precisely to the Gregory-Laflamme and Horowitz-Polchinski transitions, as expected for the flat space limit, and consistently with our proposed bounds. Furthermore, revisiting explicit calculations in type IIB string theory on <r:math xmlns:r=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><r:mrow><r:msub><r:mrow><r:mi>AdS</r:mi></r:mrow><r:mrow><r:mn>5</r:mn></r:mrow></r:msub><r:mo>×</r:mo><r:msup><r:mi>S</r:mi><r:mn>5</r:mn></r:msup></r:mrow></r:math>, we illustrate how higher-derivative corrections may alter these bounds, potentially extending their applicability toward the interior of moduli space. Using also general results about gravitational collapse in AdS, our analysis points toward a possible breakdown of the conjecture in <t:math xmlns:t=\"http://www.w3.org/1998/Math/MathML\" display=\"inline\"><t:mi>d</t:mi><t:mo>&gt;</t:mo><t:mn>10</t:mn></t:math>, suggesting an intriguing upper limit on the number of noncompact spacetime dimensions. Finally, we briefly discuss parallel considerations and implications for the dS case.","PeriodicalId":20167,"journal":{"name":"Physical Review D","volume":"7 1","pages":""},"PeriodicalIF":5.0,"publicationDate":"2025-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145260802","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":"A computationally efficient reduced order dynamic model for NVH and psychoacoustic predictions in electric powertrains","authors":"Siyu Wang ,&nbsp;Marcos Ricardo Souza ,&nbsp;Mahdi Mohammadpour ,&nbsp;Guenter Offner ,&nbsp;Stephanos Theodossiades","doi":"10.1016/j.apacoust.2025.111097","DOIUrl":"10.1016/j.apacoust.2025.111097","url":null,"abstract":"<div><div>Electric vehicles are gaining popularity due to their cleaner transportation and lower emissions. However, the shift from internal combustion engines to electric (e-) powertrains presents new challenges in Noise, Vibration, and Harshness (NVH). E-powertrains produce distinctive tonal noises due to e-motor whistling and gear whining, making it essential to address these NVH concerns and associated psychoacoustics. The computational burden of three-dimensional, fully flexible dynamic powertrain model simulations leads to the proposal for a reduced order model (ROM). The latter is developed by integrating lumped parameter and finite-element (FE) modelling methods, considering electromagnetic effects, local nonlinearities, structural flexibility and housing mobility. The ROM provides a way to predict the radiated noise from the combined e-motor, drivetrain system and housing, offering a more economical way to predict the powertrain’s sound quality. The utilisation of the prominent ratio in psychoacoustic analysis for the radiated noise is completed by adopting established neural network techniques. Moreover, the ROM results are validated by multi-body dynamics simulations and experimental measurements. Thus, for the first time a computationally efficient ROM is presented for predicting results for psychoacoustic metrics and NVH performance in e-powertrains.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"242 ","pages":"Article 111097"},"PeriodicalIF":3.4,"publicationDate":"2025-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145268570","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":"Gating-and-inpainting perspective on GW150914 ringdown overtone: Understanding the data analysis systematics","authors":"Yi-Fan Wang, Collin D. Capano, Jahed Abedi, Shilpa Kastha, Badri Krishnan, Alex B. Nielsen, Alexander H. Nitz, Julian Westerweck","doi":"10.1103/3gqn-297f","DOIUrl":"https://doi.org/10.1103/3gqn-297f","url":null,"abstract":"We revisit the recent debate on the evidence for an overtone in the black hole ringdown of GW150914 using an independent data-analysis pipeline. By gating and inpainting the data, we discard the contamination from earlier parts of the gravitational wave signal before ringdown. This enables parameter estimation to be conducted in the frequency domain, which is mathematically equivalent to the time domain method. We keep the settings as similar as possible to the previous studies by Cotesta [] and Isi [; ] which yielded conflicting results on the Bayes factor of the overtone. Our aim is to understand how different data analysis systematics, including sampling rates, erroneous timestamps, and the frequency resolution of the noise power spectrum, would influence the statistical significance of an overtone. Our main results indicate the following: (i) a low-resolution estimation of the noise power spectrum tends to diminish the significance of overtones, (ii) adjusting the start time to a later digitized point reduces the significance of overtones, and (iii) overtone evidence varies with different sampling rates if the start time is too early, indicating that the overtone is a poor model, hence we propose a convergence test to verify the validity of an overtone model. With these issues addressed, we find the Bayes factors for the overtone to range from 10 to 26 in a range of times centered at the best-fit merger time of GW150914, which supports the existence of an overtone in agreement with the conclusions of Isi in the above papers. These results are obtained by keeping the start time and sky location fixed, enabling a direct comparison with other work. Marginalizing over these parameters would lower the Bayes factor to 1 for the evidence of an overtone.","PeriodicalId":20167,"journal":{"name":"Physical Review D","volume":"159 1","pages":""},"PeriodicalIF":5.0,"publicationDate":"2025-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145260788","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}