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Title: Photocurrent as a multiphysics diagnostic of quantum materials
Authors: Ma, Qiong
Kumar, Roshan Krishna
Xu, Su-Yang
Koppens, Frank H. L.
Song, Justin Chien Wen
Keywords: Science::Physics
Issue Date: 2023
Source: Ma, Q., Kumar, R. K., Xu, S., Koppens, F. H. L. & Song, J. C. W. (2023). Photocurrent as a multiphysics diagnostic of quantum materials. Nature Reviews Physics, 5(3), 170-184.
Project: MOE2018-T3-1-002 
Journal: Nature Reviews Physics 
Abstract: The photoexcitation life cycle from incident photon (and creation of photoexcited electron–hole pair) to ultimate extraction of electrical current is a complex multiphysics process spanning across a range of spatiotemporal scales of quantum materials. Photocurrent is sensitive to a myriad of physical processes across these spatiotemporal scales, and over the past decade it has emerged as a versatile probe of electronic states, Bloch band quantum geometry, quantum kinetic processes and device characteristics of quantum materials. This Technical Review outlines the key multiphysics principles of photocurrent diagnostics, for resolving band structure and characterizing topological materials, for disentangling distinct types of carrier scattering that can range from femtosecond to nanosecond timescales and for enabling new types of remote-sensing protocols and photocurrent nanoscopy. These distinctive capabilities underscore photocurrent diagnostics as a novel multiphysics probe for a growing class of quantum materials with properties governed by physics spanning multiple spatiotemporal scales.
ISSN: 2522-5820
DOI: 10.1038/s42254-022-00551-2
Schools: School of Physical and Mathematical Sciences 
Rights: © 2023 Springer Nature Limited. All rights reserved. This article may be downloaded for personal use only. Any other use requires prior permission of the copyright holder. The Version of Record is available online at
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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