{"title":"Impurity-induced thermal crossover in fractional Chern insulators","authors":"Ke Huang, Sankar Das Sarma, Xiao Li","doi":"arxiv-2409.04349","DOIUrl":"https://doi.org/arxiv-2409.04349","url":null,"abstract":"The recent experimental observation of fractional quantum anomalous Hall\u0000(FQAH) states in rhombohedral multilayer graphene has attracted significant\u0000attention. One of the most intriguing observations is that the FQAH states at\u0000various fractional fillings give way to IQAH states as the temperature is\u0000lowered. In this work, we propose a mechanism for the appearance of FQAH states\u0000within a finite temperature range in a toy model. The model consists of a flat\u0000Chern band and impurities, and we analyze the effects of impurities on the\u0000system's behavior at finite temperatures. We believe that the crossover may\u0000arise from the competition between the energy penalty for thermal excitations\u0000and the increase in entropy. We support our theoretical argument with numerical\u0000calculations using exact diagonalization. Our results suggest that impurities\u0000may play a crucial role in the crossover from the FQAH to IQAH states in\u0000rhombohedral pentalayer graphene.","PeriodicalId":501171,"journal":{"name":"arXiv - PHYS - Strongly Correlated Electrons","volume":"44 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142180503","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}
{"title":"Correlated Ligand Electrons in the Transition-Metal Oxide SrRuO$_3$","authors":"Yuichi Seki, Yuki K. Wakabayashi, Takahito Takeda, Kohdai Inagaki, Shin-ichi Fujimori, Yukiharu Takeda, Atsushi Fujimori, Yoshitaka Taniyasu, Hideki Yamamoto, Yoshiharu Krockenberger, Masaaki Tanaka, Masaki Kobayashi","doi":"arxiv-2409.04062","DOIUrl":"https://doi.org/arxiv-2409.04062","url":null,"abstract":"In transition-metal compounds, the transition-metal d electrons play an\u0000important role in their physical properties; however, the effects of the\u0000electron correlation between the ligand p electrons have not been clear yet. In\u0000this Letter, the Ru 4d and O 2p partial density of states (PDOS) in\u0000transition-metal oxide SrRuO$_3$ involving Weyl fermions are investigated by\u0000resonant photoemission spectroscopy. The observations demonstrate that the O 2p\u0000PDOS is distorted from that predicted by first-principles calculations than the\u0000Ru 4d PDOS. The results indicate that the electron correlation in the ligand\u0000orbitals will be important to understand the electronic structure of the p-d\u0000hybridized state in strongly correlated electron systems, even with topological\u0000states.","PeriodicalId":501171,"journal":{"name":"arXiv - PHYS - Strongly Correlated Electrons","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142180571","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}
{"title":"Classical $mathbb{Z}_2$ spin liquid on the generalized four-color Kitaev model","authors":"Han Yan, Rico Pohle","doi":"arxiv-2409.04061","DOIUrl":"https://doi.org/arxiv-2409.04061","url":null,"abstract":"While $U$(1) spin liquids have been extensively studied in both quantum and\u0000classical regimes, exact classical $mathbb{Z}_2$ spin liquids arising from\u0000models with nearest-neighbor, bilinear spin interactions are still rare. In\u0000this Letter, we explore the four-color Kitaev model as a minimal model for\u0000stabilizing classical $mathbb{Z}_2$ spin liquids across a broad family of\u0000tricoordinated lattices. By formulating a $mathbb{Z}_2$ lattice gauge theory,\u0000we identify this spin liquid as being described by an emergent Gauss's law with\u0000effective charge-2 condensation, and deconfined fractionalized bond-charge\u0000excitations. We complement our findings with Monte Carlo simulations, revealing\u0000a crossover from a high-temperature paramagnet to a low-temperature liquid\u0000phase characterized by residual entropy, classical $mathbb{Z}_2$ flux order,\u0000and diffuse spin structure factors.","PeriodicalId":501171,"journal":{"name":"arXiv - PHYS - Strongly Correlated Electrons","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142180579","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}
Igor Tyulnev, Lin Zhang, Lenard Vamos, Julita Poborska, Utso Bhattacharya, Ravindra W. Chhajlany, Tobias Grass, Samuel Mañas-Valero, Eugenio Coronado, Maciej Lewenstein, Jens Biegert
{"title":"High harmonic spectroscopy reveals anisotropy of the Mott to Charge-Density-Wave phase transition in TiSe$_2$","authors":"Igor Tyulnev, Lin Zhang, Lenard Vamos, Julita Poborska, Utso Bhattacharya, Ravindra W. Chhajlany, Tobias Grass, Samuel Mañas-Valero, Eugenio Coronado, Maciej Lewenstein, Jens Biegert","doi":"arxiv-2409.04216","DOIUrl":"https://doi.org/arxiv-2409.04216","url":null,"abstract":"This work explores the use of polarization-resolved high harmonic generation\u0000(HHG) spectroscopy to investigate the quantum phases and transitions in the\u0000correlated charge density wave (CDW) phase of TiSe$_2$. Unlike previous studies\u0000focusing on crystallographic changes, the research examines the reordering that\u0000occurs within the CDW phase as the material is cooled from room temperature to\u000014 K. By linking ultrafast field-driven dynamics to the material's potential\u0000landscape, the study demonstrates how HHG is sensitive to quantum phase\u0000transitions. The findings reveal an anisotropic component below the CDW\u0000transition temperature, providing new insights into the nature of this phase.\u0000The investigation highlights the interplay between linear and nonlinear optical\u0000responses and their departure from simple perturbative dynamics, offering a\u0000fresh perspective on correlated quantum phases in condensed matter systems.","PeriodicalId":501171,"journal":{"name":"arXiv - PHYS - Strongly Correlated Electrons","volume":"112 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142180525","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}
Matthew W. Day, Kateryna Kusyak, Felix Sturm, Juan I. Aranzadi, Hope M. Bretscher, Michael Fechner, Toru Matsuyama, Marios H. Michael, Benedikt F. Schulte, Xinyu Li, Jesse Hagelstein, Dorothee Herrmann, Gunda Kipp, Alex M. Potts, Jonathan M. DeStefano, Chaowei Hu, Yunfei Huang, Takashi Taniguchi, Kenji Watanabe, Guido Meier, Dongbin Shin, Angel Rubio, Jiun-Haw Chu, Dante M. Kennes, Michael A. Sentef, James W. McIver
{"title":"Nonperturbative Nonlinear Transport in a Floquet-Weyl Semimetal","authors":"Matthew W. Day, Kateryna Kusyak, Felix Sturm, Juan I. Aranzadi, Hope M. Bretscher, Michael Fechner, Toru Matsuyama, Marios H. Michael, Benedikt F. Schulte, Xinyu Li, Jesse Hagelstein, Dorothee Herrmann, Gunda Kipp, Alex M. Potts, Jonathan M. DeStefano, Chaowei Hu, Yunfei Huang, Takashi Taniguchi, Kenji Watanabe, Guido Meier, Dongbin Shin, Angel Rubio, Jiun-Haw Chu, Dante M. Kennes, Michael A. Sentef, James W. McIver","doi":"arxiv-2409.04531","DOIUrl":"https://doi.org/arxiv-2409.04531","url":null,"abstract":"Periodic laser driving, known as Floquet engineering, is a powerful tool to\u0000manipulate the properties of quantum materials. Using circularly polarized\u0000light, artificial magnetic fields, called Berry curvature, can be created in\u0000the photon-dressed Floquet-Bloch states that form. This mechanism, when applied\u0000to 3D Dirac and Weyl systems, is predicted to lead to photon-dressed movement\u0000of Weyl nodes which should be detectable in the transport sector. The transport\u0000response of such a topological light-matter hybrid, however, remains\u0000experimentally unknown. Here, we report on the transport properties of the\u0000type-II Weyl semimetal T$mathrm{_d}$-MoTe$_mathrm{2}$ illuminated by a\u0000femtosecond pulse of circularly polarized light. Using an ultrafast\u0000optoelectronic device architecture, we observed injection currents and a\u0000helicity-dependent anomalous Hall effect whose scaling with laser field\u0000strongly deviate from the perturbative laws of nonlinear optics. We show using\u0000Floquet theory that this discovery corresponds to the formation of a magnetic\u0000Floquet-Weyl semimetal state. Numerical ab initio simulations support this\u0000interpretation, indicating that the light-induced motion of the Weyl nodes\u0000contributes substantially to the measured transport signals. This work\u0000demonstrates the ability to generate large effective magnetic fields ($>$ 30T)\u0000with light, which can be used to manipulate the magnetic and topological\u0000properties of a range of quantum materials.","PeriodicalId":501171,"journal":{"name":"arXiv - PHYS - Strongly Correlated Electrons","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142180501","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}
{"title":"Large Anomalous Hall Conductivity Derived from an $f$-Electron Collinear Antiferromagnetic Structure","authors":"Hisashi Kotegawa, Hiroto Tanaka, Yuta Takeuchi, Hideki Tou, Hitoshi Sugawara, Junichi Hayashi, Keiki Takeda","doi":"arxiv-2409.04071","DOIUrl":"https://doi.org/arxiv-2409.04071","url":null,"abstract":"Appropriate symmetry breaking generates an anomalous Hall (AH) effect, even\u0000in antiferromagnetic (AFM) materials. Itinerant magnets with $d$ electrons are\u0000typical examples that show a significant response. By contrast, the process by\u0000which a response emerges from $f$-electron AFM structures remains unclear. In\u0000this study, we show that an AFM material, Ce$_2$CuGe$_6$, yields a large AH\u0000conductivity (AHC) of $550$ $Omega^{-1}$cm$^{-1}$, which exceeds the values\u0000previously reported in $d$-electron AFM materials. Observed features, including\u0000the scaling relation against electrical conductivity, suggest that this AH\u0000transport is induced cooperatively by both intrinsic and extrinsic mechanisms\u0000derived from the AFM structure.","PeriodicalId":501171,"journal":{"name":"arXiv - PHYS - Strongly Correlated Electrons","volume":"48 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142180530","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}
{"title":"High-field magnetic phase diagrams of the $textit{R}$Mn$_6$Sn$_6$ kagome metals","authors":"Fangqi Li, Thais Victa-Trevisan, R. J. McQueeney","doi":"arxiv-2409.04273","DOIUrl":"https://doi.org/arxiv-2409.04273","url":null,"abstract":"$textit{R}$Mn$_6$Sn$_6$ ($R=$~Y,~Gd$-$Lu) kagome metals are promising\u0000materials hosting flat electronic bands and Dirac points that interact with\u0000magnetism. The coupling between the two magnetic $R$ and Mn sublattices can\u0000drive complex magnetic states with potential consequences for spin and charge\u0000transport and other topological properties. Here, we use a detailed magnetic\u0000Hamiltonian to calculate and predict the magnetic phase diagrams for\u0000$textit{R}$Mn$_6$Sn$_6$ kagome metals within the mean-field approximation.\u0000These calculations reveal a variety of collinear, non-collinear, and\u0000non-coplanar phases that arise from competition between various interlayer\u0000magnetic exchange interactions and magnetic anisotropies of the $R$ and Mn\u0000ions. We enumerate these phases and their magnetic space groups for future\u0000analysis of their impact on topological and trivial bands near the Fermi\u0000surface.","PeriodicalId":501171,"journal":{"name":"arXiv - PHYS - Strongly Correlated Electrons","volume":"48 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142180532","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}
A. Korshunov, A. Kar, C. -Y. Lim, D. Subires, J. Deng, Y. Jiang, H. Hu, D. Călugăru, C. Yi, S. Roychowdhury, C. Shekhar, G. Garbarino, P. Törmä, C. Felser, B. Andrei Bernevig, S. Blanco-Canosa
{"title":"Pressure induced quasi-long-range $sqrt{3} times sqrt{3}$ charge density wave and competing orders in the kagome metal FeGe","authors":"A. Korshunov, A. Kar, C. -Y. Lim, D. Subires, J. Deng, Y. Jiang, H. Hu, D. Călugăru, C. Yi, S. Roychowdhury, C. Shekhar, G. Garbarino, P. Törmä, C. Felser, B. Andrei Bernevig, S. Blanco-Canosa","doi":"arxiv-2409.04325","DOIUrl":"https://doi.org/arxiv-2409.04325","url":null,"abstract":"Electronic ordering is prevalent in correlated systems, which commonly\u0000exhibit competing interactions. Here, we use x-ray diffraction to show that the\u0000charge density wave transition temperature of FeGe increases with pressure and\u0000evolves towards a $sqrt{3}timessqrt{3}$ periodic lattice modulation,\u0000$mathbf{q}$$^*$=$left(frac{1}{3} frac{1}{3} frac{1}{2}right)$. In the\u0000pressure interval between 4$<$$p$$<$12 GPa both orders coexist and the spatial\u0000extent of the $sqrt{3}timessqrt{3}$ order at high pressure becomes nearly\u0000long-range, $sim$30 unit cells, while the correlation length of the 2$times$2\u0000phase remains shorter-ranged. The $sqrt{3}timessqrt{3}$ phase is the ground\u0000state above 15 GPa, consistent with harmonic DFT calculations that predict a\u0000dimerization induced $sqrt{3}timessqrt{3}$ order without phonon softening.\u0000The pressure dependence of the integrated intensities of\u0000$mathbf{q}$$_mathrm{CDW}=left(frac{1}{2} 0 frac{1}{2}right)$ and\u0000$mathbf{q}$$^*$ indicates a competition between the 2$times$2 and\u0000$sqrt{3}timessqrt{3}$ and demonstrates that the ground state of FeGe is\u0000characterized by a rich landscape of metastable/fragile phases. We discuss\u0000possible scenarios based on an order-disorder transformation and the formation\u0000of Friedel oscillations.","PeriodicalId":501171,"journal":{"name":"arXiv - PHYS - Strongly Correlated Electrons","volume":"12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142180531","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}
{"title":"Mott materials: unsuccessful metals with a bright future","authors":"Alessandra Milloch, Michele Fabrizio, Claudio Giannetti","doi":"arxiv-2409.04154","DOIUrl":"https://doi.org/arxiv-2409.04154","url":null,"abstract":"Achieving the full understanding and control of the insulator-to-metal\u0000transition in Mott materials is key for the next generation of electronics\u0000devices, with applications ranging from ultrafast transistors, volatile and\u0000non-volatile memories and artificial neurons for neuromorphic computing. In\u0000this work, we will review the state-of-the-art knowledge of the Mott\u0000transition, with specific focus on materials of relevance for actual devices,\u0000such as vanadium and other transition metal oxides and chalcogenides. We will\u0000emphasize the current attempts in controlling the Mott switching dynamics via\u0000the application of external voltage and electromagnetic pulses and we will\u0000discuss how the recent advances in time- and space-resolved techniques are\u0000boosting the comprehension of the firing process. The nature of the\u0000voltage/light-induced Mott switching is inherently different from what is\u0000attainable by the slower variation of thermodynamic parameters, thus offering\u0000promising routes to achieving the reversible and ultrafast control of\u0000conductivity and magnetism in Mott nanodevices.","PeriodicalId":501171,"journal":{"name":"arXiv - PHYS - Strongly Correlated Electrons","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142180524","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}
{"title":"High-Throughput Search and Prediction of Layered 4f-Materials","authors":"Lin Hou, Ying Wai Li, Christopher Lane","doi":"arxiv-2409.04632","DOIUrl":"https://doi.org/arxiv-2409.04632","url":null,"abstract":"The development of multifunctional devices calls for the discovery of new\u0000layered materials with novel electronic properties. f-electron systems\u0000naturally host a rich set of competing and intertwining phases owning to the\u0000presence of strong spin-orbit coupling, electron-electron interactions, and\u0000hybridization between itinerant and local electrons. However, very little\u0000attention has been devoted to exploring the f-electron family of compounds for\u0000new promising layered material candidates. Here, we identify 295 rare earth\u0000compounds from across the lanthanide series of elements that exhibit a spectrum\u0000of lattice symmetries and electronic properties. In particular, we find\u0000metallic compounds and insulating systems with band gaps covering a 0.1 eV to\u00005.3 eV range which opens new possibilities in infrared quantum sensors,\u0000designer photocatalysts, and tunable transistors. The inclusion of 4f-states in\u0000a layered system also suggests the possibility of 2D confined heavy-fermion\u0000superconductivity and topological semimetals. Our study serves as a springboard\u0000to further systematic theoretical investigation of correlation-driven\u0000properties of the 4f and other 2D materials composed of heavy elements.","PeriodicalId":501171,"journal":{"name":"arXiv - PHYS - Strongly Correlated Electrons","volume":"19 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142180527","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}