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Phonon-driven spin-Floquet magneto-valleytronics in MoS2

Author(s)
Shin, DongbinHübener, HannseGiovannini, Umberto DeJin, HosubRubio, AngelPark, Noejung
Issued Date
2018-02
DOI
10.1038/s41467-018-02918-5
URI
https://scholarworks.unist.ac.kr/handle/201301/23680
Fulltext
https://www.nature.com/articles/s41467-018-02918-5
Citation
NATURE COMMUNICATIONS, v.9, pp.638
Abstract
Two-dimensional materials equipped with strong spin-orbit coupling can display novel electronic, spintronic, and topological properties originating from the breaking of time or inversion symmetry. A lot of interest has focused on the valley degrees of freedom that can be used to encode binary information. By performing ab initio time-dependent density functional simulation on MoS2, here we show that the spin is not only locked to the valley momenta but strongly coupled to the optical E '' phonon that lifts the lattice mirror symmetry. Once the phonon is pumped so as to break time-reversal symmetry, the resulting Floquet spectra of the phonon-dressed spins carry a net out-of-plane magnetization (approximate to 0.024 mu(B) for single-phonon quantum) even though the original system is non-magnetic. This dichroic magnetic response of the valley states is general for all 2H semiconducting transition-metal dichalcogenides and can be probed and controlled by infrared coherent laser excitation.
Publisher
NATURE PUBLISHING GROUP
ISSN
2041-1723
Keyword
VALLEY POLARIZATIONMONOLAYER

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