arXiv - PHYS - Superconductivity最新文献_第3页

Chirality Detection through Vortex Bound States in ($d+id'$)-Wave Superconductor 通过（d+id'$）波超导体中的涡旋束缚态探测手性

arXiv - PHYS - Superconductivity Pub Date : 2024-09-12 DOI: arxiv-2409.07711

Soma Yoshida, Yukio Tanaka, Alexander A. Golubov, Shu-Ichiro Suzuki

{"title":"Chirality Detection through Vortex Bound States in ($d+id'$)-Wave Superconductor","authors":"Soma Yoshida, Yukio Tanaka, Alexander A. Golubov, Shu-Ichiro Suzuki","doi":"arxiv-2409.07711","DOIUrl":"https://doi.org/arxiv-2409.07711","url":null,"abstract":"We present a method for detecting the chirality $chi$ of a ($d_{zx}+i chi\u0000d_{yz}$)-wave superconductor through the analysis of the local density of\u0000states (LDOS) at the vortex core. Employing the quasiclassical Eilenberger\u0000theory, we examine the LDOS in a semi-infinite superconductor with a quantum\u0000vortex penetrating the surface perpendicularly. We show that\u0000$mathrm{sgn}[chi]$ changes completely the LDOS at the core-surface\u0000intersection. Remarkably, the difference between LDOS for the $chi = 1$ and\u0000$chi = -1$ states becomes more prominent when the surface is dirtier, meaning\u0000that one does not need to pay close attention to the surface quality of the\u0000sample. The difference between these two states arises from the symmetry of the\u0000subdominant Cooper pairs induced at the core-surface intersection: whether the\u0000subdominant $s$-wave Cooper pairs are present or not. Due to the unique nature\u0000of this phenomenon in the ($d_{zx}+i chi d_{yz}$)-wave superconductor, one can\u0000potentially demonstrate the realization of the ($d_{zx}+i chi d_{yz}$)-wave\u0000superconductivity and determine its chirality by, for instance, through\u0000scanning tunnel spectroscopy experiments.","PeriodicalId":501069,"journal":{"name":"arXiv - PHYS - Superconductivity","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142209980","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

Distinguishing between topological Majorana and trivial zero modes via transport and shot noise study in an altermagnet heterostructure 通过变磁性异质结构中的传输和射出噪声研究区分拓扑马约拉纳模式和微不足道的零模式

arXiv - PHYS - Superconductivity Pub Date : 2024-09-12 DOI: arxiv-2409.08009

Debashish Mondal, Amartya Pal, Arijit Saha, Tanay Nag

{"title":"Distinguishing between topological Majorana and trivial zero modes via transport and shot noise study in an altermagnet heterostructure","authors":"Debashish Mondal, Amartya Pal, Arijit Saha, Tanay Nag","doi":"arxiv-2409.08009","DOIUrl":"https://doi.org/arxiv-2409.08009","url":null,"abstract":"We theoretically investigate the transport and shot noise properties of a\u0000one-dimensional semiconducting nanowire with Rashba spin-orbit coupling~(SOC)\u0000placed in closed proximity to a bulk $s$-wave superconductor and an altermagnet\u0000with $d$-wave symmetry. Such heterostructure with vanishing net magnetization\u0000manifests itself as an alternative route to anchor Majorana zero modes~(MZMs)\u0000characterized by appropriate topological index~(winding number $W$).\u0000Interestingly, this system also hosts accidental zero modes~(AZMs) emerged with\u0000vanishing topological index indicating their non-topological nature.\u0000Furthermore, by incorporating three terminal setup, we explore the transport\u0000and shot noise signatures of these zero modes. At zero temperature, we obtain\u0000zero bias peak (ZBP) in differential conductance to be quantized with value\u0000$|W|times 2 e^{2}/h$ for MZMs. On the other hand, AZMs exhibit non-quantized\u0000value at zero bias. Moreover, zero temperature shot noise manifests\u0000negative~(positive) value for MZMs~(AZMs) within the bulk gap. At finite\u0000temperature, shot noise exhibits negative value~(negative to positive\u0000transition) concerning MZMs~(AZMs). Thus, the obtained signatures clearly\u0000distinguish between the MZMs and non-topological AZMs. We extend our analysis\u0000by switching on the next to nearest neighbour hopping amplitude and SOC. Our\u0000conclusion remains unaffected for this case as well. Hence, our work paves the\u0000way to differentiate between emergent MZMs and AZMs in a semiconductor/\u0000superconductor/ altermagnet heterostructure.","PeriodicalId":501069,"journal":{"name":"arXiv - PHYS - Superconductivity","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142209984","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

Quest for nuclear quadrupole relaxation in HgCa$_{2}$Ba$_{2}$Cu$_{3}$O$_δ$ 探寻 HgCa$_{2}$Ba$_{2}$Cu$_{3}$O$_δ$ 中的核四极弛豫

arXiv - PHYS - Superconductivity Pub Date : 2024-09-12 DOI: arxiv-2409.08408

Yutaka Itoh, Akihiro Ogawa, Seiji Adachi

引用次数: 0

Unveiling the 5$f$ electron hybridization process in UPd$_2$Al$_3$ via ARPES and Time-resolved PES 通过 ARPES 和时间分辨 PES 揭示 UPd$_2$Al$_3$ 中的 5$f$ 电子杂化过程

arXiv - PHYS - Superconductivity Pub Date : 2024-09-12 DOI: arxiv-2409.07816

Jiao-Jiao Song, Qi-Yi Wu, Chen Zhang, Steve M. Gilbertson, Peter S. Riseborough, Jan Rusz, John J. Joyce, Kevin S. Graham, Clifford G. Olson, Paul H. Tobash, Eric D. Bauer, Bo Chen, Hao Liu, Yu-Xia Duan, Peter M. Oppeneer, George Rodriguez, Tomasz Durakiewicz, Jian-Qiao Meng

{"title":"Unveiling the 5$f$ electron hybridization process in UPd$_2$Al$_3$ via ARPES and Time-resolved PES","authors":"Jiao-Jiao Song, Qi-Yi Wu, Chen Zhang, Steve M. Gilbertson, Peter S. Riseborough, Jan Rusz, John J. Joyce, Kevin S. Graham, Clifford G. Olson, Paul H. Tobash, Eric D. Bauer, Bo Chen, Hao Liu, Yu-Xia Duan, Peter M. Oppeneer, George Rodriguez, Tomasz Durakiewicz, Jian-Qiao Meng","doi":"arxiv-2409.07816","DOIUrl":"https://doi.org/arxiv-2409.07816","url":null,"abstract":"This study investigates the 5$f$-electron-conduction electron hybridization\u0000process in the heavy fermion superconductor UPd$_2$Al$_3$ using a combination\u0000of angle-resolved photoemission spectroscopy (ARPES) and time-resolved\u0000photoemission spectroscopy (tr-PES). ARPES measurements reveal the formation of\u0000a hybridization gap at a temperature of approximately 75 K, which becomes more\u0000pronounced as the temperature decreases. Notably, the persistence of a flat U\u00005$f$ band at temperatures well above the hybridization onset challenges\u0000conventional understanding. Our findings demonstrate a non-monotonic\u0000temperature dependence of the quasiparticle relaxation time, with an anomalous\u0000decrease at 20 K, suggesting complex electronic and magnetic interactions.\u0000These findings provide detailed insights into the 5$f$-electron hybridization\u0000process in UPd$_2$Al$_3$, with significant implications for the understanding\u0000of heavy fermion superconductivity and the role of 5$f$-electron hybridization\u0000in uranium-based materials.","PeriodicalId":501069,"journal":{"name":"arXiv - PHYS - Superconductivity","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142209989","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

A deep learning approach to search for superconductors from electronic bands 从电子带搜索超导体的深度学习方法

arXiv - PHYS - Superconductivity Pub Date : 2024-09-12 DOI: arxiv-2409.07721

Jun Li, Wenqi Fang, Shangjian Jin, Tengdong Zhang, Yanling Wu, Xiaodan Xu, Yong Liu, Dao-Xin Yao

引用次数: 0

Magnetic edge fields in UTe$_2$ near zero background fields 零背景场附近 UTe$_2$ 中的磁边缘场

arXiv - PHYS - Superconductivity Pub Date : 2024-09-12 DOI: arxiv-2409.07668

Yusuke Iguchi, Huiyuan Man, S. M. Thomas, Filip Ronning, Jun Ishizuka, Manfred Sigrist, Priscila F. S. Rosa, Kathryn A. Moler

引用次数: 0

Multiple Majorana bound states and their resilience against disorder in planar Josephson junctions 平面约瑟夫森结中的多重马约拉纳束缚态及其抗失序能力

arXiv - PHYS - Superconductivity Pub Date : 2024-09-11 DOI: arxiv-2409.07532

Pankaj Sharma, Narayan Mohanta

{"title":"Multiple Majorana bound states and their resilience against disorder in planar Josephson junctions","authors":"Pankaj Sharma, Narayan Mohanta","doi":"arxiv-2409.07532","DOIUrl":"https://doi.org/arxiv-2409.07532","url":null,"abstract":"Planar Josephson junctions are theoretically predicted to harbor zero-energy\u0000Majorana bound states (MBS) in a tunable two-dimensional geometry, at the two\u0000ends of the middle metallic channel. Here we show that three distinct\u0000topological superconducting regimes, governing the localization of the\u0000near-zero-energy MBS, appear in these planar Josephson junctions. The\u0000topologically-protected MBS appear near the narrow edges of the junction -- not\u0000only in the middle metallic channel but also in the superconducting leads which\u0000have widths similar to the values used in recent experiments. We incorporate\u0000random fluctuation in the chemical potential to investigate the influence of\u0000non-magnetic disorder on the localization of the MBS in different topological\u0000regimes and find that the MBS are quite robust against disorder because of the\u0000two-dimensional geometry. Interestingly, moderate amount of disorder reduces\u0000the splitting between the MBS pairs, possibly by minimizing the wave function\u0000overlap of the MBS. We also discuss the changes in the topological\u0000superconducting phases when the superconducting lead width is varied. Our\u0000results reveal a rich structure of the localization of topologically protected\u0000multiple MBS in experimentally-accessible planar Josephson junctions, and call\u0000for their experimental confirmation.","PeriodicalId":501069,"journal":{"name":"arXiv - PHYS - Superconductivity","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142209983","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

Theoretical study on the crystal structure of a bilayer nickel-oxychloride Sr$_3$Ni$_2$O$_5$Cl$_2$ and analysis on the occurrence of possible unconventional superconductivity 双层镍氧盐酸盐 Sr$_3$Ni$_2$O$_5$Cl$_2$ 晶体结构的理论研究和对可能出现的非常规超导现象的分析

arXiv - PHYS - Superconductivity Pub Date : 2024-09-11 DOI: arxiv-2409.06935

Masayuki Ochi, Hirofumi Sakakibara, Hidetomo Usui, Kazuhiko Kuroki

{"title":"Theoretical study on the crystal structure of a bilayer nickel-oxychloride Sr$_3$Ni$_2$O$_5$Cl$_2$ and analysis on the occurrence of possible unconventional superconductivity","authors":"Masayuki Ochi, Hirofumi Sakakibara, Hidetomo Usui, Kazuhiko Kuroki","doi":"arxiv-2409.06935","DOIUrl":"https://doi.org/arxiv-2409.06935","url":null,"abstract":"The discovery of superconductivity under high pressure with $T_c$ exceeding\u000080 K in a bilayer nickelate La$_3$Ni$_2$O$_7$ has led to a strong desire to\u0000realize similar high $T_c$ phenomena at ambient pressure. As one possible path\u0000toward realizing superconductivity at ambient pressure, we here propose to\u0000consider Sr$_3$Ni$_2$O$_5$Cl$_2$ as a possible candidate. In this study, we\u0000theoretically investigate the electronic structure of Sr$_3$Ni$_2$O$_5$Cl$_2$\u0000and its structural stability. Our phonon calculation shows that this compound\u0000with the $I4/mmm$ tetragonal structure is dynamically stable even at ambient\u0000pressure. The characteristic crystal field in this compound lowers the\u0000Ni-$d_{3z^2-r^2}$ orbital energy, by which the Ni-$d_{3z^2-r^2}$ orbital\u0000becomes rather closer to the half-filling in Sr$_3$Ni$_2$O$_5$Cl$_2$ than\u0000La$_3$Ni$_2$O$_7$. As a result, we find that superconductivity is enhanced even\u0000though a relatively strong orbital hybridization between the $t_{2g}$ and $e_g$\u0000orbitals is somewhat detrimental for superconductivity. We also check the\u0000formation enthalpy, which shows that the high-pressure synthesis can be a good\u0000way to actually produce Sr$_3$Ni$_2$O$_5$Cl$_2$. We find that\u0000Sr$_3$Ni$_2$O$_5$Cl$_2$ is a promising new candidate of bilayer-nickelate\u0000superconductors, which can possess even higher $T_c$ than pressurized\u0000La$_3$Ni$_2$O$_7$, at ambient pressure.","PeriodicalId":501069,"journal":{"name":"arXiv - PHYS - Superconductivity","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142209986","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

Enhancement of topological regime in elongated Josephson junctions 增强拉长约瑟夫森结的拓扑机制

arXiv - PHYS - Superconductivity Pub Date : 2024-09-11 DOI: arxiv-2409.07418

D. Kuiri, P. Wójcik, M. P. Nowak

引用次数: 0

Hidden Bose-Einstein Singularities in Correlated Electron Systems 相关电子系统中隐藏的玻色-爱因斯坦奇点

arXiv - PHYS - Superconductivity Pub Date : 2024-09-11 DOI: arxiv-2409.07660

Takafumi Kita

引用次数: 0