arXiv - PHYS - Superconductivity最新文献_第2页

Unconventional superconductivity in altermagnets with spin-orbit coupling 具有自旋轨道耦合的变磁体中的非常规超导性

arXiv - PHYS - Superconductivity Pub Date : 2024-09-16 DOI: arxiv-2409.10712

Vanuildo S. de Carvalho, Hermann Freire

{"title":"Unconventional superconductivity in altermagnets with spin-orbit coupling","authors":"Vanuildo S. de Carvalho, Hermann Freire","doi":"arxiv-2409.10712","DOIUrl":"https://doi.org/arxiv-2409.10712","url":null,"abstract":"We investigate some possible symmetries of the superconducting state that\u0000emerges in three-dimensional altermagnets in the presence of spin-orbit\u0000coupling. We demonstrate within a weak-coupling approach that altermagnetic\u0000fluctuations with form factor $boldsymbol{g}_{mathbf{k}}$ promote\u0000spin-triplet superconductivity described by gap functions\u0000$boldsymbol{d}(mathbf{k}) = boldsymbol{u}(mathbf{k}) times\u0000boldsymbol{g}_{mathbf{k}}$, such that $boldsymbol{u}(mathbf{k}) = -\u0000boldsymbol{u}(-mathbf{k})$. Consequently, this singles out $f$-wave\u0000spin-triplet superconductivity as the most favorable pairing state to appear in\u0000the vicinity of $d$-wave altermagnetism. Furthermore, we obtain that the\u0000combination of spin-singlet superconducting states with altermagnetism gives\u0000rise to Bogoliubov-Fermi surfaces, which are protected by a $mathbb{Z}_2$\u0000topological invariant. Using a Ginzburg-Landau analysis, we show that, for a\u0000class of spin-orbit coupled altermagnetic models, a superconducting phase is\u0000expected to appear at low temperatures as an intertwined $d + if$ state, thus\u0000breaking time-reversal symmetry spontaneously.","PeriodicalId":501069,"journal":{"name":"arXiv - PHYS - Superconductivity","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142253509","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

Microwave radiation at criticality in a hybrid Josephson array 混合约瑟夫森阵列临界时的微波辐射

arXiv - PHYS - Superconductivity Pub Date : 2024-09-15 DOI: arxiv-2409.09835

Kristen W. Léonard, Anton V. Bubis, Melissa Mikalsen, William F. Schiela, Bassel H. Elfeky, Duc Phan, Javad Shabani, Andrew P. Higginbotham

{"title":"Microwave radiation at criticality in a hybrid Josephson array","authors":"Kristen W. Léonard, Anton V. Bubis, Melissa Mikalsen, William F. Schiela, Bassel H. Elfeky, Duc Phan, Javad Shabani, Andrew P. Higginbotham","doi":"arxiv-2409.09835","DOIUrl":"https://doi.org/arxiv-2409.09835","url":null,"abstract":"Anomalous metallic behavior is ubiquitously observed near\u0000superconductor-insulator quantum critical points and, if persistent to zero\u0000temperature, poses a challenge to current theories of metals. One explanation\u0000for this behavior could be incomplete thermal equilibrium between the sample\u0000and the cryostat. However, despite decades of study, the actual temperature of\u0000an anomalous metallic sample has not been measured. We therefore introduce a\u0000new experimental probe by measuring microwave radiation emitted from the\u0000anomalous metal, using a two-dimensional array of superconductor-semiconductor\u0000hybrid Josephson junctions as a model system. The total emitted radiation\u0000exceeds the limits of thermodynamic equilibrium, but is well described by an\u0000elevated sample temperature. This extracted sample temperature matches the\u0000onset of anomalous metallic behavior. Additionally, we discover scaling\u0000behavior of radiative noise in the presence of an applied bias. Elements of our\u0000noise-scaling observations were predicted based on nonlinear critical field\u0000theories and gauge-gravity duality. This work shows that, in a prominent model\u0000system, anomalous metallic behavior is a non-equilibrium effect, and opens a\u0000new frontier in the study of universal, non-equilibrium phenomena near quantum\u0000criticality.","PeriodicalId":501069,"journal":{"name":"arXiv - PHYS - Superconductivity","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142253516","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

Berry Phase Enforced Spinor Pairing Order 贝里相位强制旋光子配对顺序

arXiv - PHYS - Superconductivity Pub Date : 2024-09-15 DOI: arxiv-2409.09579

Yi Li, Grayson R. Frazier

引用次数: 0

Enhancing superconducting transition temperature of lanthanum superhydride by increasing hydrogen vacancy concentration 通过增加氢空位浓度提高超氢化镧的超导转变温度

arXiv - PHYS - Superconductivity Pub Date : 2024-09-15 DOI: arxiv-2409.09836

Haoran Chen, Hui Wang, Junren Shi

引用次数: 0

Two-Fold Anisotropic Superconductivity in Bilayer T$_d$-MoTe$_2$ 双层 T$_d$-MoTe$_2$ 中的双向各向异性超导性

arXiv - PHYS - Superconductivity Pub Date : 2024-09-14 DOI: arxiv-2409.09308

Zizhong Li, Apoorv Jindal, Alex Strasser, Yangchen He, Wenkai Zheng, David Graf, Takashi Taniguchi, Kenji Watanabe, Luis Balicas, Cory R. Dean, Xiaofeng Qian, Abhay N. Pasupathy, Daniel A. Rhodes

{"title":"Two-Fold Anisotropic Superconductivity in Bilayer T$_d$-MoTe$_2$","authors":"Zizhong Li, Apoorv Jindal, Alex Strasser, Yangchen He, Wenkai Zheng, David Graf, Takashi Taniguchi, Kenji Watanabe, Luis Balicas, Cory R. Dean, Xiaofeng Qian, Abhay N. Pasupathy, Daniel A. Rhodes","doi":"arxiv-2409.09308","DOIUrl":"https://doi.org/arxiv-2409.09308","url":null,"abstract":"Noncentrosymmetric 2D superconductors with large spin-orbit coupling offer an\u0000opportunity to explore superconducting behaviors far beyond the Pauli limit.\u0000One such superconductor, few-layer T$_d$-MoTe$_2$, has large upper critical\u0000fields that can exceed the Pauli limit by up to 600%. However, the mechanisms\u0000governing this enhancement are still under debate, with theory pointing towards\u0000either spin-orbit parity coupling or tilted Ising spin-orbit coupling.\u0000Moreover, ferroelectricity concomitant with superconductivity has been recently\u0000observed in the bilayer, where strong changes to superconductivity can be\u0000observed throughout the ferroelectric transition pathway. Here, we report the\u0000superconducting behavior of bilayer T$_d$-MoTe$ _2$ under an in-plane magnetic\u0000field, while systematically varying magnetic field angle and out-of-plane\u0000electric field strength. We find that superconductivity in bilayer MoTe$_2$\u0000exhibits a two-fold symmetry with an upper critical field maxima occurring\u0000along the b-axis and minima along the a-axis. The two-fold rotational symmetry\u0000remains robust throughout the entire superconducting region and ferroelectric\u0000hysteresis loop. Our experimental observations of the spin-orbit coupling\u0000strength (up to 16.4 meV) agree with the spin texture and spin splitting from\u0000first-principles calculations, indicating that tilted Ising spin-orbit coupling\u0000is the dominant underlying mechanism.","PeriodicalId":501069,"journal":{"name":"arXiv - PHYS - Superconductivity","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142253515","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

Superband: an Electronic-band and Fermi surface structure database of superconductors 超带：超导体电子带和费米表面结构数据库

arXiv - PHYS - Superconductivity Pub Date : 2024-09-14 DOI: arxiv-2409.09419

Tengdong Zhang, Chenyu Suo, Yanling Wu, Xiaodan Xu, Yong Liu, Dao-Xin Yao, Jun Li

{"title":"Superband: an Electronic-band and Fermi surface structure database of superconductors","authors":"Tengdong Zhang, Chenyu Suo, Yanling Wu, Xiaodan Xu, Yong Liu, Dao-Xin Yao, Jun Li","doi":"arxiv-2409.09419","DOIUrl":"https://doi.org/arxiv-2409.09419","url":null,"abstract":"In comparison to simpler data such as chemical formulas and lattice\u0000structures, electronic band structure data provide a more fundamental and\u0000intuitive insight into superconducting phenomena. In this work, we generate\u0000superconductor's lattice structure files optimized for density functional\u0000theory (DFT) calculations. Through DFT, we obtain electronic band\u0000superconductors, including band structures, density of states (DOS), and Fermi\u0000surface data. Additionally, we outline efficient methodologies for acquiring\u0000structure data, establish high-throughput DFT computational protocols, and\u0000introduce tools for extracting this data from large-scale DFT calculations. As\u0000an example, we have curated a dataset containing information on 2474\u0000superconductors along with their experimentally determined superconducting\u0000transition temperatures, which is well-suited for machine learning\u0000applications. This work also provides guidelines for accessing and utilizing\u0000this dataset. Furthermore, we present a neural network model designed for\u0000training with this data. All the aforementioned data and code are publicly\u0000available at http://www.superband.work.","PeriodicalId":501069,"journal":{"name":"arXiv - PHYS - Superconductivity","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142253513","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

Possible pairing states in the superconducting bilayer nickelate 超导双层镍酸盐中的可能配对态

arXiv - PHYS - Superconductivity Pub Date : 2024-09-14 DOI: arxiv-2409.09321

Dheeraj Kumar Singh, Garima Goyal, Yunkyu Bang

引用次数: 0

Topological gauge theory of vortices in type-III superconductors III 型超导体涡旋的拓扑规理论

arXiv - PHYS - Superconductivity Pub Date : 2024-09-13 DOI: arxiv-2409.08866

M. C. Diamantini, C. A. Trugenberger, V. M. Vinokur

引用次数: 0

Finite-momentum superconductivity in two-dimensional altermagnets with a Rashba-type spin-orbit coupling 具有拉什巴型自旋轨道耦合的二维变磁体中的有限动量超导性

arXiv - PHYS - Superconductivity Pub Date : 2024-09-13 DOI: arxiv-2409.08972

Kohei Mukasa, Yusuke Masaki

引用次数: 0

Large-scale simulations of vortex Majorana zero modes in topological crystalline insulators 拓扑晶体绝缘体中涡旋马约拉纳零模的大尺度模拟

arXiv - PHYS - Superconductivity Pub Date : 2024-09-13 DOI: arxiv-2409.08683

Chun Yu Wan, Yujun Zhao, Yaoyi Li, Jinfeng Jia, Junwei Liu

{"title":"Large-scale simulations of vortex Majorana zero modes in topological crystalline insulators","authors":"Chun Yu Wan, Yujun Zhao, Yaoyi Li, Jinfeng Jia, Junwei Liu","doi":"arxiv-2409.08683","DOIUrl":"https://doi.org/arxiv-2409.08683","url":null,"abstract":"Topological crystalline insulators are known to support multiple Majorana\u0000zero modes (MZMs) at a single vortex, their hybridization is forbidden by a\u0000magnetic mirror symmetry $M_T$. Due to the limited energy resolution of\u0000scanning tunneling microscopes and the very small energy spacing of trivial\u0000bound states, it remains challenging to directly probe and demonstrate the\u0000existence of multiple MZMs. In this work, we propose to demonstrate the\u0000existence of MZMs by studying the hybridization of multiple MZMs in a symmetry\u0000breaking field. The different responses of trivial bound states and MZMs can be\u0000inferred from their spatial distribution in the vortex. However, the\u0000theoretical simulations are very demanding since it requires an extremely large\u0000system in real space. By utilizing the kernel polynomial method, we can\u0000efficiently simulate large lattices with over $10^8$ orbitals to compute the\u0000local density of states which bridges the gap between theoretical studies based\u0000on minimal models and experimental measurements. We show that the spatial\u0000distribution of MZMs and trivial vortex bound states indeed differs drastically\u0000in tilted magnetic fields. The zero-bias peak elongates when the magnetic field\u0000preserves $M_T$, while it splits when $M_T$ is broken, giving rise to an\u0000anisotropic magnetic response. Since the bulk of SnTe are metallic, we also\u0000study the robustness of MZMs against the bulk states, and clarify when can the\u0000MZMs produce a pronounced anisotropic magnetic response.","PeriodicalId":501069,"journal":{"name":"arXiv - PHYS - Superconductivity","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142268812","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