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  Quadrupole spin polarization as signature of second-order topological superconductors

Plekhanov, K., Müller, N., Volpez, Y., Kennes, D. M., Schoeller, H., Loss, D., et al. (2021). Quadrupole spin polarization as signature of second-order topological superconductors. Physical Review B, 103(4): L041401. doi:10.1103/PhysRevB.103.L041401.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0007-CFAC-F Version Permalink: https://hdl.handle.net/21.11116/0000-000B-C763-5
Genre: Journal Article

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 Creators:
Plekhanov, K.1, Author
Müller, N.2, Author
Volpez, Y.1, Author
Kennes, D. M.2, 3, Author           
Schoeller, H.2, Author
Loss, D.1, Author
Klinovaja, J.1, Author
Affiliations:
1Department of Physics, University of Basel, ou_persistent22              
2Institut für Theorie der Statistischen Physik, RWTH Aachen, ou_persistent22              
3Theory Group, Theory Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2266715              

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 Abstract: 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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Language(s): eng - English
 Dates: 2020-08-112020-12-082021-01-062021-01-15
 Publication Status: Issued
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1103/PhysRevB.103.L041401
arXiv: 2008.03611
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Grant ID : 757725
Funding program : Horizon 2020 (H2020)
Funding organization : European Commission (EC)
Project name : We gratefully acknowledge many useful discussions with Katharina Laubscher, Flavio Ronetti, and Ferdinand Schulz. This work was supported by the Swiss National Science Foundation, NCCR QSIT, and the Georg H. Endress foundation as well as the Deutsche Forschungsgemeinschaft via RTG 1995 and by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy - Cluster of Excellence Matter and Light for Quantum Computing (ML4Q) EXC 2004/1- 390534769. This project received funding from the European Union's Horizon 2020 research and innovation program (ERC Starting Grant, grant agreement No 757725). We acknowledge support from the Max Planck-New York City Center for Non-Equilibrium Quantum Phenomena. Simulations were performed with computing resources granted by RWTH Aachen University under projects rwth0498, rwth0563, rwth0564 and rwth0593.
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 103 (4) Sequence Number: L041401 Start / End Page: - Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008