arXiv - PHYS - Superconductivity最新文献_第9页

Topological superconductivity from repulsive interactions in twisted WSe$_2$ 扭曲 WSe$_2$ 中排斥相互作用产生的拓扑超导性

arXiv - PHYS - Superconductivity Pub Date : 2024-08-28 DOI: arxiv-2408.16075

Daniele Guerci, Daniel Kaplan, Julian Ingham, J. H. Pixley, Andrew J. Millis

{"title":"Topological superconductivity from repulsive interactions in twisted WSe$_2$","authors":"Daniele Guerci, Daniel Kaplan, Julian Ingham, J. H. Pixley, Andrew J. Millis","doi":"arxiv-2408.16075","DOIUrl":"https://doi.org/arxiv-2408.16075","url":null,"abstract":"The recent observation of superconductivity in twisted bilayer WSe$_2$ raises\u0000intriguing questions concerning the origin and the properties of\u0000superconducting states realized in bands with non-trivial topological\u0000properties and repulsive electron-electron interactions. Using a continuum band\u0000structure model, we analyze a mechanism for Coulomb interaction-driven\u0000superconductivity in twisted bilayers of WSe$_2$. We discuss the symmetries and\u0000the phenomenological properties of the resulting superconducting phases and\u0000their evolution with interlayer potential difference, tunable via an out of\u0000plane electric field. The pairing strength is a non-monotonic function of\u0000interlayer potential, being larger at intermediate values due to mixing of\u0000singlet and triplet pairing. In contrast, at larger interlayer potential, the\u0000pairing tendency is suppressed due to enhanced Coulomb repulsion. The\u0000superconducting state is chiral in a large regime of parameters and undergoes a\u0000transition to a nodal nematic superconductor at a critical potential\u0000difference. The chiral state, characterized by an intervalley-symmetric\u0000superposition of triplet and singlet pairs, is classified as a topological\u0000superconductor within the Altland-Zirnbauer class C. At zero interlayer\u0000potential difference, the superconducting state is instead of class D, which\u0000hosts Majorana zero modes, making it a promising candidate for applications in\u0000quantum computation.","PeriodicalId":501069,"journal":{"name":"arXiv - PHYS - Superconductivity","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142210024","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

Nanoscale Control of Quantum States in Radical Molecules on Superconducting Pb(111) 超导铅(111)上激元分子量子态的纳米级控制

arXiv - PHYS - Superconductivity Pub Date : 2024-08-09 DOI: arxiv-2408.05115

Chao Li, Vladislav Pokorný, Martin Žonda, Jung-Ching Liu, Ping Zhou, Outhmane Chahib, Thilo Glatzel, Robert Häner, Silvio Decurtins, Shi-Xia Liu, Rémy Pawlak, Ernst Meyer

{"title":"Nanoscale Control of Quantum States in Radical Molecules on Superconducting Pb(111)","authors":"Chao Li, Vladislav Pokorný, Martin Žonda, Jung-Ching Liu, Ping Zhou, Outhmane Chahib, Thilo Glatzel, Robert Häner, Silvio Decurtins, Shi-Xia Liu, Rémy Pawlak, Ernst Meyer","doi":"arxiv-2408.05115","DOIUrl":"https://doi.org/arxiv-2408.05115","url":null,"abstract":"Magnetic impurities on superconductors present a viable platform for building\u0000advanced applications in quantum technologies. However, a controlled\u0000manipulation of their quantum states continues to pose a significant challenge,\u0000hindering the progress in the field. Here we show the manipulation of magnetic\u0000states in the radical molecule 4,5,9,10-tetrabromo-1,3,6,8-tetraazapyrene\u0000(TBTAP) on a Pb(111) superconducting surface using low-temperature scanning\u0000tunneling microscopy. Tunneling spectra reveal Yu-Shiba-Rusinov (YSR) states\u0000near the Fermi energy in isolated molecules. A quantum phase transition from\u0000singlet to doublet ground state is induced by changing the tip-molecule\u0000distance. Additionally, the presence of a second TBTAP molecule allows tuning\u0000of the YSR state position by altering the relative distance and can induce\u0000splitting of the YSR states for certain orientations. The construction of\u0000molecular chains up to pentamers shows periodic arrangements of charged and\u0000neutral molecules, with even-numbered chains forming a charged dimer structure\u0000at one end. Information can be encoded in these chains by switching the dimer\u0000position. These findings elucidate interactions between molecular assemblies\u0000and superconducting substrates, paving the way for advanced quantum-state\u0000engineering.","PeriodicalId":501069,"journal":{"name":"arXiv - PHYS - Superconductivity","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141931744","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 superconductivity of hydrogenated $β_{12}$ borophene 增强氢化 $β_{12}$ 硼吩的超导性

arXiv - PHYS - Superconductivity Pub Date : 2024-08-09 DOI: arxiv-2408.04956

Božidar N. Šoškić, Jonas Bekaert, Cem Sevik, Milorad V. Milošević

{"title":"Enhanced superconductivity of hydrogenated $β_{12}$ borophene","authors":"Božidar N. Šoškić, Jonas Bekaert, Cem Sevik, Milorad V. Milošević","doi":"arxiv-2408.04956","DOIUrl":"https://doi.org/arxiv-2408.04956","url":null,"abstract":"Borophene stands out among elemental two-dimensional materials due to its\u0000extraordinary physical properties, including structural polymorphism, strong\u0000anisotropy, metallicity, and the potential for phonon-mediated\u0000superconductivity. However, confirming superconductivity in borophene\u0000experimentally has been evasive to date, mainly due to the detrimental effects\u0000of metallic substrates and its susceptibility to oxidation. In this study, we\u0000present an textit{ab initio} analysis of superconductivity in the\u0000experimentally synthesized hydrogenated $beta_{12}$ borophene, which has been\u0000proven to be less prone to oxidation. Our findings demonstrate that\u0000hydrogenation significantly enhances both the stability and superconducting\u0000properties of $beta_{12}$ borophene. Furthermore, we reveal that tensile\u0000strain and hole doping, achievable through various experimental methods,\u0000significantly enhance the critical temperature, reaching up to 29 K. These\u0000findings not only promote further fundamental research on superconducting\u0000borophene and its heterostructures, but also position hydrogenated borophene as\u0000a versatile platform for low-dimensional superconducting electronics.","PeriodicalId":501069,"journal":{"name":"arXiv - PHYS - Superconductivity","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141968660","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

Phase diagram of pressure-induced high temperature superconductor La$_{3}$Ni$_{2}$O$_{7+δ}$ 压力诱导高温超导体 La$_{3}$Ni_{2}$O$_{7+δ}$ 的相图

arXiv - PHYS - Superconductivity Pub Date : 2024-08-09 DOI: arxiv-2408.04970

Yuta Ueki, Hiroya Sakurai, Hibiki Nagata, Kazuki Yamane, Ryo Matsumoto, Kensei Terashima, Keisuke Hirose, Hiroto Ohta, Masaki Kato, Yoshihiko Takano

引用次数: 0

Characteristic times for gap relaxation and heat escape in nanothin NbTi superconducting filaments: thickness dependence and effect of substrate 纳米钛铌超导细丝间隙弛豫和热逸出的特征时间：厚度依赖性和基底的影响

arXiv - PHYS - Superconductivity Pub Date : 2024-08-08 DOI: arxiv-2408.04516

K. Harrabi, A. Mekki, M. V. Milosevic

{"title":"Characteristic times for gap relaxation and heat escape in nanothin NbTi superconducting filaments: thickness dependence and effect of substrate","authors":"K. Harrabi, A. Mekki, M. V. Milosevic","doi":"arxiv-2408.04516","DOIUrl":"https://doi.org/arxiv-2408.04516","url":null,"abstract":"We measured the temporal voltage response of NbTi superconducting filaments\u0000with varied nanoscale thicknesses to step current pulses that induce\u0000non-equilibrium superconducting states governed by a hot-spot mechanism. Such\u0000detected voltage emerges after a delay time td, which is intimately connected\u0000to the gap relaxation and heat escape times. By employing time-dependent\u0000Ginzburg-Landau theory to link the delay time to the applied current, we\u0000determined that the gap relaxation time depends linearly on film thickness,\u0000aligning with the acoustic mismatch theory for phonon transmission at the\u0000superconductor-substrate interface. We thereby find a gap relaxation time of\u0000104 ps per nm of thickness for NbTi films on polished sapphire. We further show\u0000that interfacial interaction with the substrate significantly impacts the gap\u0000relaxation time, with observed values of 9 ns on SiOx, 6.8 ns on fused silica,\u0000and 5.2 ns on sapphire for a 50 nm thick NbTi strip at T = 5.75 K. These\u0000insights are valuable for optimizing superconducting sensing technologies,\u0000particularly the single-photon detectors that operate in the transient regime\u0000of nanothin superconducting bridges and filaments","PeriodicalId":501069,"journal":{"name":"arXiv - PHYS - Superconductivity","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141931798","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

Unconventional Hall effects in a quasi-kagome Kondo Weyl semimetal candidate Ce$_3$TiSb$_5$ 准近代近藤韦尔半金属候选体 Ce$_3$TiSb$_5$ 中的非常规霍尔效应

arXiv - PHYS - Superconductivity Pub Date : 2024-08-08 DOI: arxiv-2408.04438

Xiaobo He, Ying Li, Yongheng Ge, Hai Zeng, Shi-Jie Song, Shuo Zou, Zhuo Wang, Yuke Li, Wenxin Ding, Jianhui Dai, Guang-Han Cao, Xiao-Xiao Zhang, Gang Xu, Yongkang Luo

{"title":"Unconventional Hall effects in a quasi-kagome Kondo Weyl semimetal candidate Ce$_3$TiSb$_5$","authors":"Xiaobo He, Ying Li, Yongheng Ge, Hai Zeng, Shi-Jie Song, Shuo Zou, Zhuo Wang, Yuke Li, Wenxin Ding, Jianhui Dai, Guang-Han Cao, Xiao-Xiao Zhang, Gang Xu, Yongkang Luo","doi":"arxiv-2408.04438","DOIUrl":"https://doi.org/arxiv-2408.04438","url":null,"abstract":"It is generally believed that electronic correlation, geometric frustration,\u0000and topology, textit{individually}, can facilitate the emergence of various\u0000intriguing properties that have attracted a broad audience for both fundamental\u0000research and potential applications. Here, we report a systematic investigation\u0000on a quasi-kagome Kondo Weyl semimetal candidate Ce$_3$TiSb$_5$. A series of\u0000unconventional Hall effects are observed. In the paramagnetic phase, signature\u0000of dynamic $c$-$f$ hybridization is revealed by a reduction of anomalous Hall\u0000effect and is connected to frustration-promoted incoherent Kondo scattering. A\u0000large topological Hall effect exceeding 0.2 $muOmega$ cm is found at low\u0000temperatures, which should be ascribed to the noncolinear magnetic structures\u0000of the frustrated quasi-kagome lattice. In addition, a peculiar loop-shaped\u0000Hall effect with switching chirality is also seen, which is inferred to be\u0000associated with magnetic domain walls that pin history-dependent spin chirality\u0000and / or Fermi-arc surface states projected from the in-gap Weyl nodes. These\u0000exotic results place Ce$_3$TiSb$_5$ in a regime of highly-frustrated\u0000antiferromagnetic dense Kondo lattice with a nontrivial topology on an\u0000``extended\" global phase diagram, and highlight the interplay among electronic\u0000correlation, geometric frustration and topology.","PeriodicalId":501069,"journal":{"name":"arXiv - PHYS - Superconductivity","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141931753","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

Fermi-Liquid Theory of Non-S-Wave Superconductivity 非 S 波超导的费米液体理论

arXiv - PHYS - Superconductivity Pub Date : 2024-08-08 DOI: arxiv-2408.04151

P. Muzikar, D. Rainer, J. A. Sauls

引用次数: 0

Imprinting Ground State Chirality on Adatom Spins 将基态手性印刻在原子自旋上

arXiv - PHYS - Superconductivity Pub Date : 2024-08-08 DOI: arxiv-2408.04578

Yun-Peng Huang, Panagiotis Kotetes

引用次数: 0

Quantum-metric-induced giant and reversible nonreciprocal transport phenomena in chiral loop-current phases of kagome metals 手性环流相中量子计量诱导的巨型和可逆非互惠输运现象

arXiv - PHYS - Superconductivity Pub Date : 2024-08-08 DOI: arxiv-2408.04233

Rina Tazai, Youichi Yamakawa, Takahiro Morimoto, Hiroshi Kontani

{"title":"Quantum-metric-induced giant and reversible nonreciprocal transport phenomena in chiral loop-current phases of kagome metals","authors":"Rina Tazai, Youichi Yamakawa, Takahiro Morimoto, Hiroshi Kontani","doi":"arxiv-2408.04233","DOIUrl":"https://doi.org/arxiv-2408.04233","url":null,"abstract":"Rich spontaneous symmetry-breaking phenomena with nontrivial quantum\u0000geometric properties in metals represent central issues in condensed matter\u0000physics. The emergence of chiral loop-current order, accompanied by\u0000time-reversal symmetry (TRS) breaking in various kagome metals, has garnered\u0000significant attention as a novel quantum topological state. Particularly\u0000noteworthy is the giant electrical magnetochiral anisotropy (eMChA) in CsV3Sb5\u0000[Guo et al, Nature 611, 461 (2022)], which provides compelling evidence of TRS\u0000and inversion-symmetry breaking. However, the underlying essence of this\u0000observation has remained obscured due to the lack of theoretical understanding.\u0000Here, we identify that the chiral loop-current induces substantial and\u0000switchable eMChA in kagome metals by taking account of the experimentally\u0000observed stripe charge-density-wave. The obtained eMChA coefficient is\u0000$gamma_{eM}propto M_{orb} tau$, where $M_{orb}$ is the loop-current-induced\u0000orbital magnetization and $tau$ is the lifetime of conduction electrons.\u0000Importantly, giant eMChA arises from the quantum metric (QM), which defines\u0000essential quantum phases of matter and their unique functionalities, including\u0000nonlinear effects. This effect is resonantly amplified in the loop-current\u0000phase, and the derived eMChA is switched by minute magnetic fields. This\u0000research elucidates the fundamental symmetry breaking in kagome metals and also\u0000sets the stage for investigating the QM-induced phenomena arising from\u0000electronic correlations.","PeriodicalId":501069,"journal":{"name":"arXiv - PHYS - Superconductivity","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141931811","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

Quantum spin liquid from electron-phonon coupling 来自电子-声子耦合的量子自旋液体

arXiv - PHYS - Superconductivity Pub Date : 2024-08-07 DOI: arxiv-2408.04002

Xun Cai, Zhaoyu Han, Zi-Xiang Li, Steven A. Kivelson, Hong Yao

引用次数: 0