In:
2D Materials, IOP Publishing, Vol. 10, No. 4 ( 2023-10-01), p. 045011-
Abstract:
The magnetic topological insulator MnBi 2 Te 4 has attracted a lot of research interests for its exotic properties due to the interplay between nontrivial topology and magnetism. Here, we report the photocurrent (PC) response of MnBi 2 Te 4 flakes under the excitation wavelengths between 633 nm and 4000 nm measured by scanning PC microscopy. We observe a significant polarization dependent PC response at the interface between metal electrode and MnBi 2 Te 4 , while the PC response remains polarization-independent at MnBi 2 Te 4 layer steps. The polarization dependent PC at the MnBi 2 Te 4 -metal electrode interface, which is attributed to the polarization dependent light absorption at the interface, preserves in the whole tested wavelength range. The responsivity of the device is 80 μ A W −1 . This responsivity as well as PC polarity is consistent with the results calculated based on a photo-thermoelectric generation mechanism, thus we infer that photo-thermoelectric effect dominates in the PC generation at MnBi 2 Te 4 -metal interface. Our results reveal the photoelectric response mechanism of the emerging material MnBi 2 Te 4 for its potential optoelectronic applications.
Type of Medium:
Online Resource
ISSN:
2053-1583
DOI:
10.1088/2053-1583/acef3a
Language:
Unknown
Publisher:
IOP Publishing
Publication Date:
2023
detail.hit.zdb_id:
2779376-X
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