Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/155636
Title: Atomic configuration controlled photocurrent in van der Waals homostructures
Authors: Xiong, Ying
Shi, Li-kun
Song, Justin Chien Wen
Keywords: Science::Physics
Issue Date: 2021
Source: Xiong, Y., Shi, L. & Song, J. C. W. (2021). Atomic configuration controlled photocurrent in van der Waals homostructures. 2D Materials, 8(3), 035008-. https://dx.doi.org/10.1088/2053-1583/abe762
Project: NRF-NRFF2016-05 
MOE2018-T3-1-002 
NTU-SUG 
Journal: 2D Materials 
Abstract: Conventional photocurrents at a p-n junction depend on macroscopic built-in fields and are typically insensitive to the microscopic details of a crystal's atomic configuration. Here we demonstrate how atomic configuration can control photocurrent in van der Waals (vdW) materials. In particular, we find bulk shift photocurrents (SPCs) can display a rich (atomic) configuration dependent phenomenology that range from contrasting SPC currents for different stacking arrangements in a vdW homostructure (e.g. AB vs BA stacking) to a strong light polarization dependence for SPC that align with crystallographic axes. Strikingly, we find that SPC in vdW homostructures can be directed by modest strain, yielding sizeable photocurrent magnitudes under unpolarized light irradiation and manifesting even in the absence of p-n junctions. These demonstrate that SPC are intimately linked to how the Bloch wavefunctions are embedded in real space, and enables a new macroscopic transport probe (photocurrent) of lattice-scale registration in vdW materials.
URI: https://hdl.handle.net/10356/155636
ISSN: 2053-1583
DOI: 10.1088/2053-1583/abe762
DOI (Related Dataset): 10.21979/N9/SIRXCX
Schools: School of Physical and Mathematical Sciences 
Rights: © 2021 The Author(s). Published by IOP Publishing Ltd. Original Content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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