Phonon-driven spin-Floquet magneto-valleytronics in MoS.

Citation data:

Nature communications, ISSN: 2041-1723, Vol: 9, Issue: 1, Page: 638

Publication Year:
2018
Captures 40
Readers 40
Mentions 1
News Mentions 1
Citations 6
Citation Indexes 6
Repository URL:
http://scholarworks.unist.ac.kr/handle/201301/23735; http://scholarworks.unist.ac.kr/handle/201301/23680
PMID:
29434265
DOI:
10.1038/s41467-018-02918-5
Author(s):
Shin, Dongbin; Hübener, Hannse; Giovannini, Umberto De; Jin, Hosub; Rubio, Angel; Park, Noejung
Publisher(s):
Springer Nature; NATURE PUBLISHING GROUP
Tags:
Chemistry; Biochemistry, Genetics and Molecular Biology; Physics and Astronomy
Most Recent News Mention
article description
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 MoS, 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 (≈0.024μ 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.