arXiv - PHYS - Superconductivity最新文献_第4页

Pressure-induced superconductivity in monoclinic RhBi$_2$ 单斜 RhBi$_2$ 中的压力诱导超导性

arXiv - PHYS - Superconductivity Pub Date : 2024-09-10 DOI: arxiv-2409.06358

KeYuan Ma, Subhajit Roychowdhury, Jonathan Noky, Horst Borrmann, Walter Schnelle, Chandra Shekhar, Sergey A. Medvedev, Claudia Felser

{"title":"Pressure-induced superconductivity in monoclinic RhBi$_2$","authors":"KeYuan Ma, Subhajit Roychowdhury, Jonathan Noky, Horst Borrmann, Walter Schnelle, Chandra Shekhar, Sergey A. Medvedev, Claudia Felser","doi":"arxiv-2409.06358","DOIUrl":"https://doi.org/arxiv-2409.06358","url":null,"abstract":"RhBi$_2$ is a polymorphic system that exhibits two distinct phases. RhBi$_2$\u0000in the triclinic phase has been identified as a weak topological insulator with\u0000a van Hove singularity point close to the Fermi energy. Thus, triclinic\u0000RhBi$_2$ is expected to exhibit exotic quantum properties under strain or\u0000pressure. In this study, we report on the emergence of superconductivity in the\u0000monoclinic RhBi$_2$ under external pressures. The electrical resistivity\u0000behavior of the monoclinic RhBi$_2$ single crystal is studied at a wide range\u0000of applied external pressures up to 40 GPa. We observe a pressure-induced\u0000superconductivity with a dome-shaped dependence of the critical temperature on\u0000pressure at pressures above 10 GPa. A maximum critical temperature\u0000($T_mathrm{c}$) value of $T_mathrm{c}$ = 5.1 K is reached at the pressure of\u000016.1 GPa. Furthermore, we performed detailed ab initio calculations to\u0000understand the electronic band structures of monoclinic RhBi$_2$ under varying\u0000pressures. The combination of topology and pressure-induced superconductivity\u0000in the RhBi$_2$ polymorphic system may provide us with a new promising material\u0000platform to investigate topological superconductivity.","PeriodicalId":501069,"journal":{"name":"arXiv - PHYS - Superconductivity","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142209990","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

Intravalley spin-polarized superconductivity in rhombohedral tetralayer graphene 斜方四层石墨烯的谷内自旋极化超导性

arXiv - PHYS - Superconductivity Pub Date : 2024-09-10 DOI: arxiv-2409.06701

Yang-Zhi Chou, Jihang Zhu, Sankar Das Sarma

{"title":"Intravalley spin-polarized superconductivity in rhombohedral tetralayer graphene","authors":"Yang-Zhi Chou, Jihang Zhu, Sankar Das Sarma","doi":"arxiv-2409.06701","DOIUrl":"https://doi.org/arxiv-2409.06701","url":null,"abstract":"We study the intravalley spin-polarized superconductivity in rhombohedral\u0000tetralayer graphene, which has been discovered experimentally in Han $et$ $al$\u0000arXiv:2408.15233. We construct a minimal model for the intravalley\u0000spin-polarized superconductivity, assuming a simplified anisotropic interaction\u0000that depends only on the angle between the incoming and outgoing momenta.\u0000Despite the absence of Fermi surface nesting, we show that the\u0000superconductivity appears near the Van Hove singularity with the maximal $T_c$\u0000near a bifurcation point of the peaks in the density of states. We identify the\u0000topological $p+ip$, topological $h+ih$, and the non-topological nodal $f$-wave\u0000pairings as the possible states, which are all pair density wave orders due to\u0000the intravalley nature. Furthermore, these pair density wave orders require a\u0000finite attractive threshold for superconductivity, resulting in narrow\u0000superconducting regions, consistent with experimental findings. We discuss the\u0000possible pairing mechanisms and point out that the Kohn-Luttinger mechanism is\u0000a plausible explanation for the intravalley spin-polarized superconductivity in\u0000the rhombohedral tetralayer graphene.","PeriodicalId":501069,"journal":{"name":"arXiv - PHYS - Superconductivity","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142209988","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

Theory of Topological Superconductivity and Antiferromagnetic Correlated Insulators in Twisted Bilayer WSe${}_2$ 扭曲双层 WSe${}_2$ 中的拓扑超导和反铁磁相关绝缘体理论

arXiv - PHYS - Superconductivity Pub Date : 2024-09-10 DOI: arxiv-2409.06779

Chuyi Tuo, Ming-Rui Li, Zhengzhi Wu, Wen Sun, Hong Yao

{"title":"Theory of Topological Superconductivity and Antiferromagnetic Correlated Insulators in Twisted Bilayer WSe${}_2$","authors":"Chuyi Tuo, Ming-Rui Li, Zhengzhi Wu, Wen Sun, Hong Yao","doi":"arxiv-2409.06779","DOIUrl":"https://doi.org/arxiv-2409.06779","url":null,"abstract":"Since the very recent discovery of unconventional superconductivity in\u0000twisted WSe${}_{2}$ homobilayers at filling $nu=-1$, considerable interests\u0000arise in revealing its mechanism. In this paper, we developed a three-band\u0000tight-binding model with non-trivial band topology by direct Wannierization of\u0000the low-energy continuum model. Incorporating both onsite Hubbard repulsion and\u0000next-nearest-neighbor attraction, we then performed a mean-field analysis of\u0000the microscopic model and obtained a phase diagram qualitatively consistent\u0000with the experiment results. For zero or weak displacement field, the ground\u0000state is a Chern number $C=pm 2$ topological superconductor in the\u0000Altland-Zirnbauer A-class (breaking time-reversal but preserving total $S_z$\u0000symmetry) with inter-valley pairing dominant in $d_{xy}mp id_{x^2-y^2}$-wave\u0000(mixing with a subdominant $p_xpm i p_y$-wave) component. For a relatively\u0000strong displacement field, the ground state is a correlated insulator with\u0000$120^circ$ antiferromagnetic order. Our results provide new insights into the\u0000nature of the twisted WSe${}_{2}$ systems and suggest the need for further\u0000theoretical and experimental explorations.","PeriodicalId":501069,"journal":{"name":"arXiv - PHYS - Superconductivity","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142209987","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

Quantized current steps due to the synchronization of microwaves with Bloch oscillations in small Josephson junctions 小型约瑟夫森结中微波与布洛赫振荡同步产生的量化电流阶跃

arXiv - PHYS - Superconductivity Pub Date : 2024-09-09 DOI: arxiv-2409.05707

Rais S. Shaikhaidarov, Kyung Ho Kim, Jacob Dunstan, Ilya Antonov, Dmitry Golubev, Vladimir N Antonov, Oleg V Astafiev

引用次数: 0

Superconductivity in ternary pyrite-type compound IrBi$_{1-x}$Te$_{1+x}$ ($x approx 0.2$) at ambient and high pressure 三元黄铁矿型化合物 IrBi$_{1-x}$Te$_{1+x}$ ($x approx 0.2$) 在环境和高压下的超导性

arXiv - PHYS - Superconductivity Pub Date : 2024-09-09 DOI: arxiv-2409.05649

Qing-Ge Mu, Walter Schnelle, Guo-Wei Li, Horst Bormann, Claudia Felser, Sergey Medvedev

引用次数: 0

Superconductivity of alpha-gallium probed on the atomic scale by normal and Josephson tunneling 通过正常隧穿和约瑟夫森隧穿探测阿尔法镓在原子尺度上的超导性

arXiv - PHYS - Superconductivity Pub Date : 2024-09-09 DOI: arxiv-2409.05758

C. Fohn, D. Wander, D. Nikolic, S. Garaudée, H. Courtois, W. Belzig, C. Chapelier, V. Renard, C. B. Winkelmann

引用次数: 0

Spontaneous magnetic field and disorder effects in BaPtAs_1-x_Sb_x_ with honeycomb network 具有蜂巢网络的 BaPtAs_1-x_Sb_x_ 中的自发磁场和无序效应

arXiv - PHYS - Superconductivity Pub Date : 2024-09-09 DOI: arxiv-2409.05266

T. Adachi, T. Ogawa, Y. Komiyama, T. Sumura, Y. Saito-Tsuboi, T. Takeuchi, K. Mano, K. Manabe, K. Kawabata, T. Imazu, A. Koda, W. Higemoto, H. Okabe, J. G. Nakamura, T. U. Ito, R. Kadono, C. Baines, I. Watanabe, Y. Imai, J. Goryo, M. Nohara, K. Kudo

{"title":"Spontaneous magnetic field and disorder effects in BaPtAs_1-x_Sb_x_ with honeycomb network","authors":"T. Adachi, T. Ogawa, Y. Komiyama, T. Sumura, Y. Saito-Tsuboi, T. Takeuchi, K. Mano, K. Manabe, K. Kawabata, T. Imazu, A. Koda, W. Higemoto, H. Okabe, J. G. Nakamura, T. U. Ito, R. Kadono, C. Baines, I. Watanabe, Y. Imai, J. Goryo, M. Nohara, K. Kudo","doi":"arxiv-2409.05266","DOIUrl":"https://doi.org/arxiv-2409.05266","url":null,"abstract":"Chiral superconductivity exhibits the formation of novel electron pairs that\u0000breaks the time-reversal symmetry and has been actively studied in various\u0000quantum materials in recent years. However, despite its potential to provide\u0000definitive information, effects of disorder in the crystal structure on the\u0000chiral superconductivity has not yet been clarified, and therefore the\u0000investigation using a solid-solution system is desirable. We report\u0000muon-spin-relaxation (muSR) results of layered pnictide BaPtAs_1-x_Sb_x_ with a\u0000honeycomb network composed of Pt and (As, Sb). We observed an increase of the\u0000zero-field muon-spin relaxation rate in the superconducting (SC) state at the\u0000Sb end of x=1.0, suggesting the occurrence of spontaneous magnetic field due to\u0000the time-reversal symmetry breaking in the SC state. On the other hand,\u0000spontaneous magnetic field was almost and completely suppressed for the As-Sb\u0000mixed samples of x=0.9 and 0.2, respectively, suggesting that the time-reversal\u0000symmetry breaking SC state in x=1.0 is sensitive to disorder. The magnetic\u0000penetration depth estimated from transverse-field muSR measurements at x=1.0\u0000and 0.2 behaved like weak-coupling s-wave superconductivity. These seemingly\u0000incompatible zero-field and transverse-field muSR results of BaPtAs_1-x_Sb_x_\u0000with x=1.0 could be understood in terms of chiral d-wave superconductivity with\u0000point nodes on the three-dimensional Fermi surface.","PeriodicalId":501069,"journal":{"name":"arXiv - PHYS - Superconductivity","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142210173","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

Room-temperature superconductivity in 1D 一维室温超导性

arXiv - PHYS - Superconductivity Pub Date : 2024-09-08 DOI: arxiv-2409.05031

Carlo A. Trugenberger

引用次数: 0

Signatures of enhanced spin-triplet superconductivity induced by interfacial properties 界面特性诱导的自旋三重超导电性增强特征

arXiv - PHYS - Superconductivity Pub Date : 2024-09-08 DOI: arxiv-2409.04943

Chenghao Shen, Jong E. Han, Thomas Vezin, Mohammad Alidoust, Igor Žutić

{"title":"Signatures of enhanced spin-triplet superconductivity induced by interfacial properties","authors":"Chenghao Shen, Jong E. Han, Thomas Vezin, Mohammad Alidoust, Igor Žutić","doi":"arxiv-2409.04943","DOIUrl":"https://doi.org/arxiv-2409.04943","url":null,"abstract":"While spin-triplet pairing remains elusive in nature, there is a growing\u0000effort to realize proximity-induced equal-spin triplet superconductivity in\u0000junctions with magnetic regions or an applied magnetic field and common\u0000$s$-wave superconductors. To enhance such spin-triplet contribution, it is\u0000expected that junctions with a weak interfacial barrier and strong spin-orbit\u0000coupling are desirable. Intuitively, a weak interfacial barrier enables a\u0000robust proximity-induced superconductivity and strong spin-orbit coupling\u0000promotes spin mixing, converting spin-singlet into spin-triplet\u0000superconductivity. In contrast, we reveal a nonmonotonic spin-triplet\u0000contribution with the strength of the interfacial barrier and spin-orbit\u0000coupling. This picture is established by considering different signatures in\u0000conductance and superconducting correlations, as well as by performing\u0000self-consistent calculations. As a result, we identify a strongly enhanced\u0000spin-triplet superconductivity, realized for an intermediate strength of\u0000interfacial barrier and spin-orbit coupling. In junctions with magnetic\u0000regions, an enhanced spin-triplet superconductivity leads to a large\u0000magnetoanisotropy of conductance and superconducting correlations. This picture\u0000of an enhanced spin-triplet superconductivity is consistent with experiments\u0000demonstrating a huge increase in the conductance magnetoanisotropy, which we\u0000predict can be further enhanced at a finite bias.","PeriodicalId":501069,"journal":{"name":"arXiv - PHYS - Superconductivity","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142210180","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

Enhanced Quasiparticle Relaxation in a Superconductor via the Proximity Effect 通过邻近效应增强超导体中的准粒子弛豫

arXiv - PHYS - Superconductivity Pub Date : 2024-09-08 DOI: arxiv-2409.05233

Kevin M. Ryan, Venkat Chandrasekhar

引用次数: 0