Quadrupole spin polarization as signature of second-order topological superconductors

Plekhanov, Kirill and Mueller, Niclas and Volpez, Yanick and Kennes, Dante M. and Schoeller, Herbert and Loss, Daniel and Klinovaja, Jelena. (2021) Quadrupole spin polarization as signature of second-order topological superconductors. Physical Review B, 103 (4). L041401.

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Official URL: https://edoc.unibas.ch/86414/

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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.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Theoretical Nano/Quantum Physics (Klinovaja)
UniBasel Contributors:Klinovaja, Jelena
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Physical Society
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:28 Jan 2022 15:53
Deposited On:28 Jan 2022 15:53

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