Midgap states induced by Zeeman field and p-wave superconductor pairing

Jin, Yuanjun1,2; Yue, XingYu3,4; Xu, Yong5; Yu, Xiang-Long6,7; Chang, Guoqing2

2024-06-03

10.1103/PhysRevB.109.L241101

PHYSICAL REVIEW B   影响因子和分区

2469-9950

2469-9969

The one-dimensional Su-Schrieffer-Heeger (SSH) model is central to band topology in condensed matter physics, which allows us to understand and design distinct topological states. In this work, we find another mechanism to analogize the SSH model in a spinful system, realizing an obstructed atomic insulator by introducing intrinsic spin-orbit coupling and in-plane Zeeman field. In our model, the midgap states originate from a quantized hidden polarization with invariant index Z(2) (0; 01) due to the local inversion symmetry breaking. When the global inversion symmetry is broken, a charge pumping is designed by tuning the polarization. Moreover, by introducing the p+ip superconductor pairing potential, a new topological phase dubbed obstructed superconductor (OSC) is identified. This new state is characterized by invariant index Z(2) (0; 01) and nonchiral midgap states. More interestingly, these nonchiral edge states result in a chiral-like nonlocal conductance, which is different from the traditional chiral topological superconductor. Our findings not only find another strategy to achieve a spinful SSH model but also predict the existence of OSC, providing a promising avenue for further exploration of its transport properties.

SCI ; EI

英语

其他

National Research Foundation, Singapore, under its Fellowship Award[NRF-NRFF13-2021-0010] ; Agency for Science, Technology and Research (A*STAR) under its Manufacturing, Trade and Connectivity (MTC) Individual Research Grant (IRG)[M23M6c0100] ; Singapore Ministry of Education (MOE) AcRF Tier 2 Grant[MOE-T2EP50222-0014] ; Scientific Research Starting Foundation of Ningbo University of Technology[2022KQ51] ; China Postdoctoral Science Foundation[2023M743783] ; Natural Science Foundation of Guang-dong Province[2023A1515011852] ; South China Normal Uni-versity[8S078628]

Materials Science ; Physics

Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter

WOS:001241005000013

AMER PHYSICAL SOC

PHYSICS

Web of Science

1.South China Normal Univ, Guangdong Basic Res Ctr Excellence Struct & Fundam, Guangdong Prov Key Lab Quantum Engn & Quantum Mat, Sch Phys, Guangzhou 510006, Peoples R China
2.Nanyang Technol Univ, Div Phys & Appl Phys, Sch Phys & Math Sci, Singapore 637371, Singapore
3.Univ Hong Kong, Phys Dept, Pokfulam Rd, Hong Kong, Peoples R China
4.Univ Hong Kong, Guangdong Hong Kong Joint Lab Quantum Matter, Pokfulam Rd, Hong Kong, Peoples R China
5.Ningbo Univ Technol, Inst Micro Nano Mat & Devices, Ningbo 315016, Zhejiang, Peoples R China
6.Southern Univ Sci & Technol, Shenzhen Inst Quantum Sci & Engn, Shenzhen 518055, Peoples R China
7.Int Quantum Acad, Shenzhen 518048, Peoples R China

Jin, Yuanjun,Yue, XingYu,Xu, Yong,et al. Midgap states induced by Zeeman field and p-wave superconductor pairing[J]. PHYSICAL REVIEW B,2024,109(24).

Jin, Yuanjun,Yue, XingYu,Xu, Yong,Yu, Xiang-Long,&Chang, Guoqing.(2024).Midgap states induced by Zeeman field and p-wave superconductor pairing.PHYSICAL REVIEW B,109(24).

Jin, Yuanjun,et al."Midgap states induced by Zeeman field and p-wave superconductor pairing".PHYSICAL REVIEW B 109.24(2024).