Moiré-Enabled Topological Superconductivity

Shawulienu Kezilebieke; Viliam Vaňo; Md N. Huda; Markus Aapro; Somesh C. Ganguli; Peter Liljeroth; Jose L. Lado

doi:10.1021/acs.nanolett.1c03856

Moiré-Enabled Topological Superconductivity

Shawulienu Kezilebieke, Viliam Vaňo, Md N. Huda, Markus Aapro, Somesh C. Ganguli, Peter Liljeroth, Jose L. Lado

Research output: Contribution to journal › Article › peer-review

37 Scopus citations

Abstract

The search for artificial topological superconductivity has been limited by the stringent conditions required for its emergence. As exemplified by the recent discoveries of various correlated electronic states in twisted van der Waals materials, moiré patterns can act as a powerful knob to create artificial electronic structures. Here, we demonstrate that a moiré pattern between a van der Waals superconductor and a monolayer ferromagnet creates a periodic potential modulation that enables the realization of a topological superconducting state that would not be accessible in the absence of the moiré. The magnetic moiré pattern gives rise to Yu–Shiba–Rusinov minibands and periodic modulation of the Majorana edge modes that we detect using low-temperature scanning tunneling microscopy (STM) and spectroscopy (STS). Moiré patterns and, more broadly, periodic potential modulations are powerful tools to overcome the conventional constraints for realizing and controlling topological superconductivity.

Original language	English
Pages (from-to)	328-333
Number of pages	6
Journal	Nano Letters
Volume	22
Issue number	1
DOIs	https://doi.org/10.1021/acs.nanolett.1c03856
State	Published - Jan 12 2022
Externally published	Yes

Funding

This research made use of the Aalto Nanomicroscopy Center (Aalto NMC) facilities and was supported by the European Research Council (Grant ERC-2017-AdG No. 788185 “Artificial Designer Materials”), Academy of Finland (Academy Professor Funding Grants 318995 and 320555, Academy Research Fellow Grants 331342, 336243, 338478, and 346654), and the Jane and Aatos Erkko Foundation. We acknowledge the computational resources provided by the Aalto Science-IT project.

Keywords

2D ferromagnet
moiré pattern
scanning tunneling microscopy
topological superconductor

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10.1021/acs.nanolett.1c03856

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abstract = "The search for artificial topological superconductivity has been limited by the stringent conditions required for its emergence. As exemplified by the recent discoveries of various correlated electronic states in twisted van der Waals materials, moir{\'e} patterns can act as a powerful knob to create artificial electronic structures. Here, we demonstrate that a moir{\'e} pattern between a van der Waals superconductor and a monolayer ferromagnet creates a periodic potential modulation that enables the realization of a topological superconducting state that would not be accessible in the absence of the moir{\'e}. The magnetic moir{\'e} pattern gives rise to Yu–Shiba–Rusinov minibands and periodic modulation of the Majorana edge modes that we detect using low-temperature scanning tunneling microscopy (STM) and spectroscopy (STS). Moir{\'e} patterns and, more broadly, periodic potential modulations are powerful tools to overcome the conventional constraints for realizing and controlling topological superconductivity.",

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AU - Kezilebieke, Shawulienu

AU - Vaňo, Viliam

AU - Huda, Md N.

AU - Aapro, Markus

AU - Ganguli, Somesh C.

AU - Liljeroth, Peter

AU - Lado, Jose L.

PY - 2022/1/12

Y1 - 2022/1/12

N2 - The search for artificial topological superconductivity has been limited by the stringent conditions required for its emergence. As exemplified by the recent discoveries of various correlated electronic states in twisted van der Waals materials, moiré patterns can act as a powerful knob to create artificial electronic structures. Here, we demonstrate that a moiré pattern between a van der Waals superconductor and a monolayer ferromagnet creates a periodic potential modulation that enables the realization of a topological superconducting state that would not be accessible in the absence of the moiré. The magnetic moiré pattern gives rise to Yu–Shiba–Rusinov minibands and periodic modulation of the Majorana edge modes that we detect using low-temperature scanning tunneling microscopy (STM) and spectroscopy (STS). Moiré patterns and, more broadly, periodic potential modulations are powerful tools to overcome the conventional constraints for realizing and controlling topological superconductivity.

AB - The search for artificial topological superconductivity has been limited by the stringent conditions required for its emergence. As exemplified by the recent discoveries of various correlated electronic states in twisted van der Waals materials, moiré patterns can act as a powerful knob to create artificial electronic structures. Here, we demonstrate that a moiré pattern between a van der Waals superconductor and a monolayer ferromagnet creates a periodic potential modulation that enables the realization of a topological superconducting state that would not be accessible in the absence of the moiré. The magnetic moiré pattern gives rise to Yu–Shiba–Rusinov minibands and periodic modulation of the Majorana edge modes that we detect using low-temperature scanning tunneling microscopy (STM) and spectroscopy (STS). Moiré patterns and, more broadly, periodic potential modulations are powerful tools to overcome the conventional constraints for realizing and controlling topological superconductivity.

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Moiré-Enabled Topological Superconductivity

Abstract

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Keywords

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