arXiv - PHYS - Strongly Correlated Electrons最新文献_第10页

Large-$N$ SU(4) Schwinger boson theory for coupled-dimer antiferromagnets 耦合二聚反铁磁体的大-N$ SU(4) 施文格玻色子理论

arXiv - PHYS - Strongly Correlated Electrons Pub Date : 2024-09-06 DOI: arxiv-2409.04627

Shang-Shun Zhang, Yasuyuki Kato, E. A. Ghioldi, L. O. Manuel, A. E. Trumper, Cristian D. Batista

{"title":"Large-$N$ SU(4) Schwinger boson theory for coupled-dimer antiferromagnets","authors":"Shang-Shun Zhang, Yasuyuki Kato, E. A. Ghioldi, L. O. Manuel, A. E. Trumper, Cristian D. Batista","doi":"arxiv-2409.04627","DOIUrl":"https://doi.org/arxiv-2409.04627","url":null,"abstract":"We develop a systematic large-$N$ expansion based on the Schwinger boson\u0000representation of SU(4) coherent states of dimers for the paradigmatic\u0000spin-$1/2$ bilayer square lattice Heisenberg antiferromagnet. This system\u0000exhibits a quantum phase transition between a quantum paramagnetic state and a\u0000N'eel order state, driven by the coupling constant $g = J'/J$, which is\u0000defined as the ratio between the inter-dimer $J'$ and intra-dimer $J$ exchange\u0000interactions. We demonstrate that this approach accurately describes static and\u0000dynamic properties on both sides of the quantum phase transition. The critical\u0000coupling constant $g_c approx 0.42$ and the dynamic spin structure factor\u0000reproduce quantum Monte Carlo results with high precision. Notably, the $1/N$\u0000corrections reveal the longitudinal mode of the magnetically ordered phase\u0000along with the overdamping caused by its decay into the two-magnon continuum.\u0000The present large-$N$ $SU(N)$ Schwinger boson theory can be extended to more\u0000general cases of quantum paramagnets that undergo a quantum phase transition\u0000into magnetically ordered states.","PeriodicalId":501171,"journal":{"name":"arXiv - PHYS - Strongly Correlated Electrons","volume":"82 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142180473","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 quantum criticality: dynamical mean-field perspective 磁量子临界性：动态均场视角

arXiv - PHYS - Strongly Correlated Electrons Pub Date : 2024-09-06 DOI: arxiv-2409.04308

S. Adler, D. R. Fus, M. O. Malcolms, A. Vock, K. Held, A. A. Katanin, T. Schäfer, A. Toschi

引用次数: 0

Large spontaneous Hall effect with flexible domain control in an antiferromagnetic material TaMnP 反铁磁性材料 TaMnP 中具有柔性畴控制的大自发霍尔效应

arXiv - PHYS - Strongly Correlated Electrons Pub Date : 2024-09-06 DOI: arxiv-2409.04064

Hisashi Kotegawa, Akira Nakamura, Vu Thi Ngoc Huyen, Yuki Arai, Hideki Tou, Hitoshi Sugawara, Junichi Hayashi, Keiki Takeda, Chihiro Tabata, Koji Kaneko, Katsuaki Kodama, Michi-To Suzuki

{"title":"Large spontaneous Hall effect with flexible domain control in an antiferromagnetic material TaMnP","authors":"Hisashi Kotegawa, Akira Nakamura, Vu Thi Ngoc Huyen, Yuki Arai, Hideki Tou, Hitoshi Sugawara, Junichi Hayashi, Keiki Takeda, Chihiro Tabata, Koji Kaneko, Katsuaki Kodama, Michi-To Suzuki","doi":"arxiv-2409.04064","DOIUrl":"https://doi.org/arxiv-2409.04064","url":null,"abstract":"Antiferromagnets without parity-time ($mathcal{PT}$) symmetry offer novel\u0000perspectives in the field of functional magnetic materials. Among them, those\u0000with ferromagnetic-like responses are promising candidates for future\u0000applications such as antiferromagnetic (AF) memory; however, examples showing\u0000large effects are extremely limited. In this study, we show that the\u0000orthorhombic system TaMnP exhibits a large anomalous Hall conductivity (AHC)\u0000$sim360-370$ $Omega^{-1}$cm$^{-1}$ in spite of the small net magnetization\u0000$sim10^{-2}$ $mu_B$/Mn. Our neutron scattering experiment and the observation\u0000of the AH effect indicated that a magnetic structure of TaMnP was dominated by\u0000an AF component represented by $B_{3g}$ with the propagation vector $q=0$.\u0000Furthermore, we confirmed that the obtained AHC is among the largest observed\u0000in AF materials at zero fields. Additionally, our first-principles calculations\u0000revealed that the spin-orbit interaction originating in the nonmagnetic Ta-$5d$\u0000electrons significantly contributes to enhancing Berry curvatures in the\u0000momentum space. We found that the magnetic fields along all the crystal axes\u0000triggered the AF domain switching, indicating the possibility of controlling\u0000the AF domain using the small net magnetization, which is symmetrically\u0000different.","PeriodicalId":501171,"journal":{"name":"arXiv - PHYS - Strongly Correlated Electrons","volume":"154 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142180529","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

Negative dynamic conductivity of the photoinduced $η$ pairing state 光诱导η$配对态的负动态电导率

arXiv - PHYS - Strongly Correlated Electrons Pub Date : 2024-09-06 DOI: arxiv-2409.04604

Satoshi Ejima, Benedikt Fauseweh

引用次数: 0

Microscopic Theory of Nonlinear Hall Effect in Three-dimesional Mangetic Systems 三元锰系非线性霍尔效应的微观理论

arXiv - PHYS - Strongly Correlated Electrons Pub Date : 2024-09-06 DOI: arxiv-2409.04638

Wen-Tao Hou, Jiadong Zang

引用次数: 0

Easy-axis Heisenberg model on the triangular lattice: from supersolid to gapped solid 三角形晶格上的易轴海森堡模型：从超固体到间隙固体

arXiv - PHYS - Strongly Correlated Electrons Pub Date : 2024-08-09 DOI: arxiv-2408.05034

Martin Ulaga, Jure Kokalj, Peter Prelovšek

引用次数: 0

Fractional quantum anomalous Hall effect in rhombohedral multilayer graphene with a strong displacement field 具有强位移场的斜方多层石墨烯中的分数量子反常霍尔效应

arXiv - PHYS - Strongly Correlated Electrons Pub Date : 2024-08-09 DOI: arxiv-2408.05139

Ke Huang, Sankar Das Sarma, Xiao Li

引用次数: 0

Frustrated charge density wave and quasi-long-range bond-orientational order in the magnetic kagome FeGe 磁性卡戈梅铁锗中的受挫电荷密度波和准长程键取向秩序

arXiv - PHYS - Strongly Correlated Electrons Pub Date : 2024-08-08 DOI: arxiv-2408.04452

D. Subires, A. Kar, A. Korshunov, C. A. Fuller, Y. Jiang, H. Hu, Dumitru Călugăru, C. McMonagle, C. Yi, S. Roychowdhury, C. Shekhar, J. Strempfer, A. Jana, I. Vobornik, J. Dai, M. Tallarida, D. Chernyshov, A. Bosak, C. Felser, B. Andrei Bernevig, S. Blanco-Canosa

{"title":"Frustrated charge density wave and quasi-long-range bond-orientational order in the magnetic kagome FeGe","authors":"D. Subires, A. Kar, A. Korshunov, C. A. Fuller, Y. Jiang, H. Hu, Dumitru Călugăru, C. McMonagle, C. Yi, S. Roychowdhury, C. Shekhar, J. Strempfer, A. Jana, I. Vobornik, J. Dai, M. Tallarida, D. Chernyshov, A. Bosak, C. Felser, B. Andrei Bernevig, S. Blanco-Canosa","doi":"arxiv-2408.04452","DOIUrl":"https://doi.org/arxiv-2408.04452","url":null,"abstract":"The intrinsic frustrated nature of a kagome lattice is amenable to the\u0000realization of exotic phases of matter, such as quantum spin liquids or spin\u0000ices, and more recently the multiple-$mathrm{textbf{q}}$ charge density waves\u0000(CDW) in the kagome metals. Despite intense efforts to understand the mechanism\u0000driving the electronic modulations, its origin is still unknown and hindered by\u0000competing interactions and intertwined orders. Here, we identify a\u0000dimerization-driven 2D hexagonal charge-diffuse precursor in the\u0000antiferromagnetic kagome metal FeGe and demonstrate that the fraction of\u0000dimerized/undimerized states is the relevant order parameter of the\u0000multiple-$mathrm{textbf{q}}$ CDW of a continuous phase transition. The\u0000pretransitional charge fluctuations with propagation vector\u0000$mathrm{textbf{q}=textbf{q}_M}$ at T$_{mathrm{CDW}}$$<$T$<$T$^*$(125 K) are\u0000anisotropic, hence holding a quasi-long-range bond-orientational order. The\u0000broken translational symmetry emerges from the anisotropic diffuse precursor,\u0000akin to the Ising scenario of antiferromagnetic triangular lattices. The\u0000temperature and momentum dependence of the critical scattering show parallels\u0000to the stacked hexatic $mathrm{B}$-phases reported in liquid crystals and\u0000transient states of CDWs and highlight the key role of the topological\u0000defect-mediated melting of the CDW in FeGe.","PeriodicalId":501171,"journal":{"name":"arXiv - PHYS - Strongly Correlated Electrons","volume":"57 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141936448","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

Electronic structure of UTe$_2$ under pressure 压力下 UTe$_2$ 的电子结构

arXiv - PHYS - Strongly Correlated Electrons Pub Date : 2024-08-08 DOI: arxiv-2408.04292

Makoto Shimizu, Youichi Yanase

{"title":"Electronic structure of UTe$_2$ under pressure","authors":"Makoto Shimizu, Youichi Yanase","doi":"arxiv-2408.04292","DOIUrl":"https://doi.org/arxiv-2408.04292","url":null,"abstract":"A heavy-fermion paramagnet UTe$_2$ has been a strong candidate for a\u0000spin-triplet superconductor. Experiments on ute under pressure have been\u0000vigorously conducted, and rich phase diagrams have been suggested. Multiple\u0000superconducting phases exist in the pressure region of $0 leq P < 1.8\u0000mathrm{;GPa}$, and an antiferromagnetic ordered state is observed in the\u0000high-pressure region $P > 1.8 mathrm{;GPa}$. However, under pressure, an\u0000underlying electronic structure in the normal state has not been clarified,\u0000although knowledge of electronic structures is essential for studying magnetic\u0000and superconducting states. As an indispensable step toward understanding the\u0000phase diagram of UTe$_2$, we study the electronic structure under hydrostatic\u0000and uniaxial pressures based on density functional theory with and without\u0000employing structural optimization. It is shown that the low-energy band\u0000structure and Fermi surfaces are not sensitive to pressure for parameters where\u0000itinerant $f$-electrons are not essential. However, we find significant\u0000pressure dependence for particular Coulomb interaction $U$ of the GGA+$U$\u0000calculation, where the large weight of $f$-electrons appears on the Fermi\u0000level. We also discuss the possibility of a pressure-induced Lifshitz\u0000transition accompanied by the topological superconducting transition. The\u0000electronic structure can change from three-dimensional to two-dimensional under\u0000uniaxial pressure along the [010] and [001] axes.","PeriodicalId":501171,"journal":{"name":"arXiv - PHYS - Strongly Correlated Electrons","volume":"15 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141936411","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

Exotic Kondo effect in two one dimensional spin 1/2 chains coupled to two localized spin 1/2 magnets 与两个局部自旋 1/2 磁体耦合的两个一维自旋 1/2 链中的奇异近藤效应

arXiv - PHYS - Strongly Correlated Electrons Pub Date : 2024-08-08 DOI: arxiv-2408.04353

Igor Kuzmenko, Tetyana Kuzmenko, Y. B. Band, Yshai Avishai

{"title":"Exotic Kondo effect in two one dimensional spin 1/2 chains coupled to two localized spin 1/2 magnets","authors":"Igor Kuzmenko, Tetyana Kuzmenko, Y. B. Band, Yshai Avishai","doi":"arxiv-2408.04353","DOIUrl":"https://doi.org/arxiv-2408.04353","url":null,"abstract":"We study an exotic Kondo effect in a system consisting of two one-dimensional\u0000XX Heisenberg ferromagnetic spin $1/2$ chains (denoted by $alpha = u, d$ for\u0000up and down chains) coupled to a quantum dot consisting of two localized spin\u0000$1/2$ magnets. Using the Jordan-Wigner transformation on the Heisenberg\u0000Hamiltonian of the two chains, this system can be expressed in terms of\u0000non-interacting spinless fermionic quasiparticles. As a result, the Hamiltonian\u0000of the whole system is expressed as an Anderson model for spin 1/2 fermions\u0000interacting with a spin-1/2 impurity. Thus, we study the scattering of\u0000fermionic quasiparticles (propagating along spin chains) by a pair of localized\u0000magnetic impurities. At low temperature, the localized spin $1/2$ magnets are\u0000shielded by the chain `spins' via the Kondo effect. We calculate the Kondo\u0000temperature $T_K$ and derive the temperature dependence of the entropy, the\u0000specific heat, the specific heat and the `magnetic susceptibility' of the dot\u0000for $T gg T_K$. Our results can be generalized to the case of\u0000anti-ferromagnetic XX chains.","PeriodicalId":501171,"journal":{"name":"arXiv - PHYS - Strongly Correlated Electrons","volume":"371 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141936449","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