Visualization of the strain-induced topological phase transition in a quasi-one-dimensional superconductor TaSe3

Lin, Ching Yih; Ochi, Masayuki; Noguchi, Ryo; Kuroda, Kenta; Sakoda, Masahito; Nomura, Atsushi; Tsubota, Masakatsu; Zhang, Peng; Bareille, C.; Kurokawa, Kifu; Arai, Yutaro; Kawaguchi, Kakuhiro; Tanaka, Hiroaki; Yaji, Koichiro; Harasawa, Ayumi; Hashimoto, M.; Lü, Donghui; Shin, Shik; Arita, Ryotaro; Tanda, Satoshi; Kondo, Takeshi

doi:10.1038/s41563-021-01004-4

Cited by 76 publications

(57 citation statements)

References 51 publications

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“…These materials include MoTe 2 [41], TaSe 3 [42,43], and α-Ga [44]. Topological states were experimentally observed by angle-resolved photoemission spectroscopy (ARPES) in MoTe 2 [45] and TaSe 3 [46]. Within superconducting semimetals, CaSb 2 offers a good balance between a moderately high T c of 1.6 K and large MR of 25 at 2 K and 9 T, similar to TaSe 3 .…”

Section: B Semimetallic Properties and Band Structurementioning

confidence: 99%

Superconductivity and Quantum Oscillations in Single Crystals of the Compensated Semimetal CaSb$_{2}$

Oudah,

Bannies,

Bonn

et al. 2021

Preprint

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Bulk superconductivity in a topological semimetal is a first step towards realizing topological superconductors, which can host Majorana fermions allowing us to achieve quantum computing. Here, we report superconductivity and compensation of electrons and holes in single crystals of the nodal-line semimetal CaSb2. We characterize the superconducting state and find that Cooper pairs have moderate-weak coupling, and the superconducting transition in specific heat down to 0.22 K deviates from that of a BCS superconductor. The non-saturating magnetoresistance and electron-hole compensation at low temperature are consistent with density functional theory (DFT) calculations showing nodal-line features. Furthermore, we observe de Haas-van Alphen (dHvA) oscillations consistent with a small Fermi surface in the semimetallic state of CaSb2. Our DFT calculations show that the two electron bands crossing the Fermi level are associated with Sb1 zigzag chains, while the hole band is associated with Sb2 zig-zag chains. The Sb1 zig-zag chains form a distorted square net, which may relate the M Sb2 family to the well known M SbTe square net semimetals. Realization of superconductivity and a compensated semimetal state in single crystals of CaSb2 establishes the diantimonide family as a candidate class of materials for achieving topological superconductivity.

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Section: B Semimetallic Properties and Band Structurementioning

confidence: 99%

Superconductivity and Quantum Oscillations in Single Crystals of the Compensated Semimetal CaSb$_{2}$

Oudah,

Bannies,

Bonn

et al. 2021

Preprint

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“…Nevertheless, the asymmetric spectral backgrounds in Sn2 and Cr layers consistently indicate the many-body effect in CrIr 2 Sn 10 . The electron correlation and comparable spin–orbit coupling could produce novel quantum phases such as topological Mott insulators , and quantum spin liquids …”

Section: Results and Discussionmentioning

confidence: 99%

Signatures of Spin–Orbit Coupling and Charge Localization in CrIr₂Sn₁₀: A Scanning Tunneling Microscopic Study

Fang

Zha

et al. 2022

J. Phys. Chem. C

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Magnetic topological insulators and semimetals have become an import branch in the study of topological materials. Topological materials with intrinsic magnetism are superior for better quality and performances. Here, we report a scanning tunneling microscopic study of CrIr 2 Sn 10 , a newly synthesized material as a candidate for magnetic topological semimetals. Sn and Cr surface terminations are identified with distinctive spectroscopic characters. Charge localization is signified by the density of states peak near −200 meV that is consistent with the flat band dispersion in density functional theory calculations. The electron correlations are further evidenced by the particle−hole asymmetry in the background of the differential conductance spectrum. The insertion of Cr layers not only introduces ferromagnetism in the material but also breaks the local inversion symmetry of the Sn-Ir-Sn unit structure compared with IrSn 4 . The spin− orbit coupling thus induced/enhanced is essential to the band topologies. Our findings suggest that CrIr 2 Sn 10 could be an ideal platform for exploring the symmetry-protected topological phases and their interplay with electron correlation and magnetism.

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“…Most recently, the all-electrical generation, manipulation, and detection of spin polarization have been demonstrated in chiral single-crystalline 1D Te NWs, inspiring us to exploit chiral spintronic devices . In addition to the electrostatic control, the strain effect can also be used to induce the reversible topological phase transition as observed in 1D superconducting TaSe 3 ACs, thus allowing for an on/off switching of spin current . The interplay of topological phase transition with superconductivity in TaSe 3 ACs would promote the basic and technological research for engineering topological spintronics.…”

Section: Electronics Of Atomic Chainsmentioning

confidence: 99%

One-Dimensional Atomic Chains for Ultimate-Scaled Electronics

Meng

Wang

2022

ACS Nano

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The continuous downscaling of semiconducting channels in transistors has driven the development of modern electronics. However, with the component transistors becoming smaller and denser on a single chip, the continued downscaling progress has touched the physical limits. In this Perspective, we suggest that the emerging one-dimensional (1D) material system involving inorganic atomic chains (ACs) that are packed by van der Waals (vdW) interactions may tackle this issue. Stemming from their 1D crystal structures and naturally terminated surfaces, 1D ACs could potentially shrink transistors to atomic-scale diameters. Also, we argue that 1D ACs with few-atom widths allow us to revisit 1D materials and uncover physical properties distinct from conventional materials. These ultrathin 1D AC materials demand substantive attention. They may bring opportunities to develop ultimate-scaled AC-based electronic, optoelectronic, thermoelectric, spintronic, memory devices, etc.

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Visualization of the strain-induced topological phase transition in a quasi-one-dimensional superconductor TaSe3

Cited by 76 publications

References 51 publications

Superconductivity and Quantum Oscillations in Single Crystals of the Compensated Semimetal CaSb$_{2}$

Superconductivity and Quantum Oscillations in Single Crystals of the Compensated Semimetal CaSb$_{2}$

Signatures of Spin–Orbit Coupling and Charge Localization in CrIr₂Sn₁₀: A Scanning Tunneling Microscopic Study

One-Dimensional Atomic Chains for Ultimate-Scaled Electronics

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Visualization of the strain-induced topological phase transition in a quasi-one-dimensional superconductor TaSe3

Cited by 76 publications

References 51 publications

Superconductivity and Quantum Oscillations in Single Crystals of the Compensated Semimetal CaSb$_{2}$

Superconductivity and Quantum Oscillations in Single Crystals of the Compensated Semimetal CaSb$_{2}$

Signatures of Spin–Orbit Coupling and Charge Localization in CrIr2Sn10: A Scanning Tunneling Microscopic Study

One-Dimensional Atomic Chains for Ultimate-Scaled Electronics

Contact Info

Product

Resources

About

Signatures of Spin–Orbit Coupling and Charge Localization in CrIr₂Sn₁₀: A Scanning Tunneling Microscopic Study