TY - JOUR
T1 - Nonreciprocal transport in gate-induced polar superconductor SrTiO3
AU - Itahashi, Yuki M.
AU - Ideue, Toshiya
AU - Saito, Yu
AU - Shimizu, Sunao
AU - Ouchi, Takumi
AU - Nojima, Tsutomu
AU - Iwasa, Yoshihiro
N1 - Funding Information:
Y.M.I. was supported by the Advanced Leading Graduate Course for Photon Science (ALPS). Y.S. was supported by the Japan Society for the Promotion of Science (JSPS) through a research fellowship for young scientists (Grant-in-Aid for JSPS Research Fellow, JSPS KAKENHI grant number JP15J07681). T.I. was supported by JSPS KAKENHI grant numbers JP19K21843, JP19H01819, and JP18H04216, JST PRESTO project (JPMJPR19L1) and grant from Yazaki Memorial Foundation for Science and Technology. This work was supported by JSPS KAKENHI grant numbers JP19H05602 and JP15H05884.
PY - 2020
Y1 - 2020
N2 - Polar conductors/superconductors with Rashba-type spin-orbit interaction are potential material platforms for quantum transport and spintronic functionalities. One of their inherent properties is the nonreciprocal transport, where the rightward and leftward currents become inequivalent, reflecting spatial inversion/time-reversal symmetry breaking. Such a rectification effect originating from the polar symmetry has been recently observed at interfaces or bulk Rashba semiconductors, while its mechanism in a polar superconductor remains elusive. Here, we report the nonreciprocal transport in gate-induced two-dimensional superconductor SrTiO3, which is a Rashba superconductor candidate. In addition to the gigantic enhancement of nonreciprocal signals in the superconducting fluctuation region, we found kink and sharp peak structures around critical temperatures, which reflect the crossover behavior from the paraconductivity origin to the vortex origin, based on a microscopic theory. 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.
AB - Polar conductors/superconductors with Rashba-type spin-orbit interaction are potential material platforms for quantum transport and spintronic functionalities. One of their inherent properties is the nonreciprocal transport, where the rightward and leftward currents become inequivalent, reflecting spatial inversion/time-reversal symmetry breaking. Such a rectification effect originating from the polar symmetry has been recently observed at interfaces or bulk Rashba semiconductors, while its mechanism in a polar superconductor remains elusive. Here, we report the nonreciprocal transport in gate-induced two-dimensional superconductor SrTiO3, which is a Rashba superconductor candidate. In addition to the gigantic enhancement of nonreciprocal signals in the superconducting fluctuation region, we found kink and sharp peak structures around critical temperatures, which reflect the crossover behavior from the paraconductivity origin to the vortex origin, based on a microscopic theory. 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.
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U2 - 10.1126/sciadv.aay9120
DO - 10.1126/sciadv.aay9120
M3 - Article
C2 - 32258403
AN - SCOPUS:85082797365
VL - 6
JO - Science advances
JF - Science advances
SN - 2375-2548
IS - 13
M1 - eaay9120
ER -