Examining the possibility of chiral superconductivity in Sr2RuO4 and other compounds via applied supercurrent

Liu，Hao Tian1,2,3; Chen，Weipeng1,2,3; Yin，Jia Xin4; Liu，Cai5; Huang，Wen1,2,3

2024

10.1103/PhysRevB.109.014508

Physical Review B   影响因子和分区

2469-9950

2469-9969

One approach to probe the still controversial superconductivity in Sr2RuO4 is to apply external perturbations that break the underlying tetragonal crystalline symmetry. Chiral px+ipy and dxz+idyz states respond to such perturbations in ways that may help to distinguish them from other superconducting pairings. However, past experimental efforts along this line, using uniaxial strains and magnetic fields parallel to the RuO2 plane, have not been able to reach an unambiguous conclusion. In this study, we propose to further examine the possibility of chiral superconducting order in Sr2RuO4 using an alternative tetragonal-symmetry-breaking perturbation - in-plane supercurrent. We study the superconducting phase diagram as a function of both temperature and the applied supercurrent. Supercurrent generically splits the transition of the two chiral order parameter components, and we show that the splitting can give rise to visible specific heat anomalies. Furthermore, supercurrent parallel and antiparallel to the unidirectional propagation of the chiral edge modes impact the edge states in a different manner. This difference manifests in the tunneling spectrum, thereby providing an additional means to probe the chirality even when the related spontaneous edge current is vanishingly small. Finally, we discuss the distinction of supercurrent responses in nonchiral time-reversal-symmetry-breaking superconducting states. Our proposal can be applied to other candidate chiral superconductors.

SCI ; EI

英语

第一

PHYSICS

2-s2.0-85182402391

Scopus

1.Shenzhen Institute for Quantum Science and Engineering,Southern University of Science and Technology,Shenzhen,Guangdong,518055,China
2.International Quantum Academy,Shenzhen,518048,China
3.Guangdong Provincial Key Laboratory of Quantum Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
4.Department of Physics,Southern University of Science and Technology,Shenzhen,Guangdong,China
5.College of Integrated Circuits and Optoelectronic Chips,Shenzhen Technology University,Shenzhen,Guangdong,518118,China

Liu，Hao Tian,Chen，Weipeng,Yin，Jia Xin,et al. Examining the possibility of chiral superconductivity in Sr2RuO4 and other compounds via applied supercurrent[J]. Physical Review B,2024,109(1).

Liu，Hao Tian,Chen，Weipeng,Yin，Jia Xin,Liu，Cai,&Huang，Wen.(2024).Examining the possibility of chiral superconductivity in Sr2RuO4 and other compounds via applied supercurrent.Physical Review B,109(1).

Liu，Hao Tian,et al."Examining the possibility of chiral superconductivity in Sr2RuO4 and other compounds via applied supercurrent".Physical Review B 109.1(2024).