Superconductivity protected by spin-valley locking in ion-gated MoS2
- Yu Saito, Yasuharu Nakamura, Y. Iwasa
- Physics
- 12 June 2015
The electric-field-induced superconducting properties of MoS2 are investigated by means of magneto-transport measurements, uncovering evidence of spin–momentum locking. Symmetry-breaking has been…
Superconductivity Series in Transition Metal Dichalcogenides by Ionic Gating
- W. Shi, Jianting Ye, Y. Iwasa
- PhysicsScientific Reports
- 3 August 2015
Alternative gating using KClO4/polyethylene glycol enabled a crossover from surface doping to bulk doping, which induced superconductivities in MoTe2 and WS2 electrochemically and greatly enriched the TMD superconductor families and unveiled critical methodology to expand the capability of ionic gating to other materials.
Metallic ground state in an ion-gated two-dimensional superconductor
- Yu Saito, Y. Kasahara, Jianting Ye, Y. Iwasa, T. Nojima
- PhysicsScience
- 4 March 2015
It is reported that an ion-gated zirconium nitride chloride surface, exhibiting a dome-shaped phase diagram with a maximum critical temperature of 14.8 kelvin, behaves as a superconductor persisting to the 2D limit.
Isospin magnetism and spin-polarized superconductivity in Bernal bilayer graphene
- Haoxin Zhou, Ludwig Holleis, A. Young
- PhysicsScience
- 21 October 2021
In conventional superconductors, Cooper pairing occurs between electrons of opposite spin. We observe spin-polarized superconductivity in Bernal bilayer graphene when doped to a saddle-point van Hove…
Highly crystalline 2D superconductors
Recent advances in materials fabrication have enabled the manufacturing of ordered 2D electron systems, such as heterogeneous interfaces, atomic layers grown by molecular beam epitaxy, exfoliated…
Independent superconductors and correlated insulators in twisted bilayer graphene
- Yu Saito, Jingyuan Ge, Kenji Watanabe, T. Taniguchi, A. Young
- PhysicsNature Physics
- 29 November 2019
When two sheets of graphene are stacked on top of each other with a small twist of angle θ ≈ 1.1° between them, theory predicts the formation of a flat electronic band 1 , 2 . Experiments have shown…
Nonreciprocal charge transport in noncentrosymmetric superconductors
- R. Wakatsuki, Yu Saito, N. Nagaosa
- PhysicsScience Advances
- 15 March 2017
Results indicate that electrons feel the noncentrosymmetric crystal potential much coherently and sensitively over the correlation length when they form Cooper pairs, and show open a new route to enhance the nonreciprocal response toward novel functionalities, including superconducting diodes.
Nonreciprocal transport in gate-induced polar superconductor SrTiO3
- Yuki M. Itahashi, T. Ideue, Y. Iwasa
- PhysicsScience Advances
- 1 March 2020
The present result proves that the nonreciprocal transport is a powerful tool for investigating the interfacial/polar superconductors without inversion symmetry, where rich exotic features are theoretically prognosticated.
Quantum and classical ratchet motions of vortices in a two-dimensional trigonal superconductor
- Yuki M. Itahashi, Yu Saito, T. Ideue, T. Nojima, Y. Iwasa
- Physics
- 1 April 2019
Dynamical behavior of vortices plays central roles in the quantum phenomena of two-dimensional (2D) superconductors. Quantum metallic state, for example, showing an anomalous temperature-independent…
Gate-Optimized Thermoelectric Power Factor in Ultrathin WSe2 Single Crystals.
- M. Yoshida, T. Iizuka, S. Shimizu
- Materials Science, PhysicsNano letters (Print)
- 10 February 2016
We report an electric field tuning of the thermopower in ultrathin WSe2 single crystals over a wide range of carrier concentration by using electric double-layer (EDL) technique. We succeeded in the…
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