Phonon-driven spin-Floquet magneto-valleytronics in MoS2

Dongbin Shin, Hannes Hübener, Umberto De Giovannini, Hosub Jin, Angel Rubio () and Noejung Park ()
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Dongbin Shin: Ulsan National Institute of Science and Technology
Hannes Hübener: Center for Free-Electron Laser Science
Umberto De Giovannini: Center for Free-Electron Laser Science
Hosub Jin: Ulsan National Institute of Science and Technology
Angel Rubio: Center for Free-Electron Laser Science
Noejung Park: Ulsan National Institute of Science and Technology

Nature Communications, 2018, vol. 9, issue 1, 1-8

Abstract: 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 (≈0.024μB 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.

Date: 2018
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DOI: 10.1038/s41467-018-02918-5

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