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Title: Spatiotemporal Mapping of a Photocurrent Vortex in Monolayer MoS2 Using Diamond Quantum Sensors

Abstract

Photocurrents are central to understanding and harnessing the interaction of light with matter. Here, we introduce a contact-free method to spatially resolve photocurrent distributions using proximal quantum magnetometers. We interface monolayer MoS2 with a near-surface ensemble of nitrogen-vacancy centers in diamond and map the generated photothermal current distribution through its magnetic-field profile. By synchronizing pulsed photoexcitation with dynamical decoupling of the sensor spin, we extend the sensor's quantum coherence and resolve time-dependent, two-dimensional current densities as small as 20 nA/mu m, with a projected sensitivity of 200 nA/mu m root Hz). Our spatially resolved measurements reveal that optical excitation can generate micron-sized photocurrent vortices in MoS2, manifesting a photo-Nernst effect exceeding that of gate-tuned graphene at comparable magnetic fields. We further probe the rise time of the photocurrents and show that thermal diffusion determines its spatial variation. These spatiotemporal capabilities establish an optically accessed, local probe for optoelectronic phenomena, ideally suited to the emerging class of two-dimensional materials, for which making contacts is challenging and can alter the intrinsic material properties.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
Air Force Research Laboratory (AFRL) - Air Force Office of Scientific Research (AFOSR); University of Chicago - Materials Research Science & Engineering Center (MRSEC)
OSTI Identifier:
1595950
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Physical Review. X
Additional Journal Information:
Journal Volume: 10; Journal Issue: 1
Country of Publication:
United States
Language:
English
Subject:
Condensed Matter Physics; Materials Science; Quantum Physics

Citation Formats

Zhou, Brian B., Jerger, Paul C., Lee, Kan-Heng, Fukami, Masaya, Mujid, Fauzia, Park, Jiwoong, and Awschalom, David D. Spatiotemporal Mapping of a Photocurrent Vortex in Monolayer MoS2 Using Diamond Quantum Sensors. United States: N. p., 2020. Web. doi:10.1103/PhysRevX.10.011003.
Zhou, Brian B., Jerger, Paul C., Lee, Kan-Heng, Fukami, Masaya, Mujid, Fauzia, Park, Jiwoong, & Awschalom, David D. Spatiotemporal Mapping of a Photocurrent Vortex in Monolayer MoS2 Using Diamond Quantum Sensors. United States. doi:10.1103/PhysRevX.10.011003.
Zhou, Brian B., Jerger, Paul C., Lee, Kan-Heng, Fukami, Masaya, Mujid, Fauzia, Park, Jiwoong, and Awschalom, David D. Mon . "Spatiotemporal Mapping of a Photocurrent Vortex in Monolayer MoS2 Using Diamond Quantum Sensors". United States. doi:10.1103/PhysRevX.10.011003.
@article{osti_1595950,
title = {Spatiotemporal Mapping of a Photocurrent Vortex in Monolayer MoS2 Using Diamond Quantum Sensors},
author = {Zhou, Brian B. and Jerger, Paul C. and Lee, Kan-Heng and Fukami, Masaya and Mujid, Fauzia and Park, Jiwoong and Awschalom, David D.},
abstractNote = {Photocurrents are central to understanding and harnessing the interaction of light with matter. Here, we introduce a contact-free method to spatially resolve photocurrent distributions using proximal quantum magnetometers. We interface monolayer MoS2 with a near-surface ensemble of nitrogen-vacancy centers in diamond and map the generated photothermal current distribution through its magnetic-field profile. By synchronizing pulsed photoexcitation with dynamical decoupling of the sensor spin, we extend the sensor's quantum coherence and resolve time-dependent, two-dimensional current densities as small as 20 nA/mu m, with a projected sensitivity of 200 nA/mu m root Hz). Our spatially resolved measurements reveal that optical excitation can generate micron-sized photocurrent vortices in MoS2, manifesting a photo-Nernst effect exceeding that of gate-tuned graphene at comparable magnetic fields. We further probe the rise time of the photocurrents and show that thermal diffusion determines its spatial variation. These spatiotemporal capabilities establish an optically accessed, local probe for optoelectronic phenomena, ideally suited to the emerging class of two-dimensional materials, for which making contacts is challenging and can alter the intrinsic material properties.},
doi = {10.1103/PhysRevX.10.011003},
journal = {Physical Review. X},
number = 1,
volume = 10,
place = {United States},
year = {2020},
month = {1}
}

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