4.6 Article

Quadrupole spin polarization as signature of second-order topological superconductors

期刊

PHYSICAL REVIEW B
卷 103, 期 4, 页码 -

出版社

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.103.L041401

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资金

  1. Swiss National Science Foundation
  2. NCCR QSIT
  3. Deutsche Forschungsgemeinschaft [RTG 1995]
  4. Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy - Cluster of Excellence Matter and Light for Quantum Computing [EXC 2004/1-390534769]
  5. European Union's Horizon 2020 research and innovation program (ERC Starting Grant) [757725]
  6. Max Planck-New York City Center for Non-Equilibrium Quantum Phenomena
  7. RWTH Aachen University [rwth0498, rwth0563, rwth0564, rwth0593]
  8. Georg H. Endress foundation

向作者/读者索取更多资源

Theoretical study on second-order topological superconductors reveals a quadrupole spin polarization at system edges, offering a new signature for identifying topological phases. Experimental access to this feature can be achieved through spin-polarized scanning tunneling microscopes.
We study theoretically second-order topological superconductors characterized by the presence of pairs of zero-energy Majorana corner states. We uncover a quadrupole spin polarization at the system edges that provides a striking signature to identify topological phases, thereby complementing standard approaches based on zero-bias conductance peaks due to Majorana corner states. We consider two different classes of second-order topological superconductors with broken time-reversal symmetry and show that both classes are characterized by a quadrupolar structure of the spin polarization that disappears as the system passes through the topological phase transition. This feature can be accessed experimentally using spin-polarized scanning tunneling microscopes. We study different models hosting second-order topological phases, both analytically and numerically, and using Keldysh techniques we provide numerical simulations of the spin-polarized currents probed by scanning tips.

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