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Breaking of Valley Degeneracy by Magnetic Field in Monolayer MoSe<sub>2</sub>

Breaking of Valley Degeneracy by Magnetic Field in Monolayer MoSe2

Type of Publication: Journal article
Author: MacNeill, David; Heikes, Colin; Mak, Kin Fai; Anderson, Zackary; Kormanyos, Andor; Zólyomi, Viktor; Park, Jiwoong; Ralph, Daniel C.
Year of publication: 2015
Published in: Physical Review Letters ; 114 (2015), 3. - 037401. - ISSN 0031-9007. - eISSN 1079-7114
DOI (citable link): https://dx.doi.org/10.1103/PhysRevLett.114.037401
Summary:
Using polarization-resolved photoluminescence spectroscopy, we investigate the breaking of valley degeneracy by an out-of-plane magnetic field in back-gated monolayer MoSe2 devices. We observe a linear splitting of −0.22  meV/T between luminescence peak energies in σ+ and σ− emission for both neutral and charged excitons. The optical selection rules of monolayer MoSe2 couple the photon handedness to the exciton valley degree of freedom; so this splitting demonstrates valley degeneracy breaking. In addition, we find that the luminescence handedness can be controlled with a magnetic field to a degree that depends on the back-gate voltage. An applied magnetic field, therefore, provides effective strategies for control over the valley degree of freedom.
Subject (DDC): 530 Physics
Bibliography of Konstanz: Yes

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MACNEILL, David, Colin HEIKES, Kin Fai MAK, Zackary ANDERSON, Andor KORMANYOS, Viktor ZÓLYOMI, Jiwoong PARK, Daniel C. RALPH, 2015. Breaking of Valley Degeneracy by Magnetic Field in Monolayer MoSe2. In: Physical Review Letters. 114(3), 037401. ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/PhysRevLett.114.037401

@article{MacNeill2015Break-31056, title={Breaking of Valley Degeneracy by Magnetic Field in Monolayer MoSe2}, year={2015}, doi={10.1103/PhysRevLett.114.037401}, number={3}, volume={114}, issn={0031-9007}, journal={Physical Review Letters}, author={MacNeill, David and Heikes, Colin and Mak, Kin Fai and Anderson, Zackary and Kormanyos, Andor and Zólyomi, Viktor and Park, Jiwoong and Ralph, Daniel C.}, note={Article Number: 037401} }

Kormanyos, Andor Using polarization-resolved photoluminescence spectroscopy, we investigate the breaking of valley degeneracy by an out-of-plane magnetic field in back-gated monolayer MoSe<sub>2</sub> devices. We observe a linear splitting of −0.22  meV/T between luminescence peak energies in σ<sub>+</sub> and σ<sub>−</sub> emission for both neutral and charged excitons. The optical selection rules of monolayer MoSe<sub>2</sub> couple the photon handedness to the exciton valley degree of freedom; so this splitting demonstrates valley degeneracy breaking. In addition, we find that the luminescence handedness can be controlled with a magnetic field to a degree that depends on the back-gate voltage. An applied magnetic field, therefore, provides effective strategies for control over the valley degree of freedom. Park, Jiwoong 2015-05-29T05:45:06Z Kormanyos, Andor Zólyomi, Viktor Anderson, Zackary 2015 Mak, Kin Fai eng Heikes, Colin Breaking of Valley Degeneracy by Magnetic Field in Monolayer MoSe<sub>2</sub> MacNeill, David Zólyomi, Viktor MacNeill, David Ralph, Daniel C. Anderson, Zackary Mak, Kin Fai 2015-05-29T05:45:06Z Ralph, Daniel C. Park, Jiwoong Heikes, Colin

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