Spin coherence and dephasing of localized electrons in monolayer MoS${}_2$

Abstract

We report a systematic study of coherent spin precession and spin dephasing in electron-doped monolayer MoS${}_2$. Using time-resolved Kerr rotation spectroscopy and applied in-plane magnetic fields, a nanosecond-timescale Larmor spin precession signal commensurate with $g$-factor $|g_0|\simeq 1.86$ is observed in several different MoS${}_2$ samples grown by chemical vapor deposition. The dephasing rate of this oscillatory signal increases linearly with magnetic field, suggesting that the coherence arises from a sub-ensemble of localized electron spins having an inhomogeneously-broadened distribution of $g$-factors, $g_0+\Delta g$. In contrast to $g_0$, $\Delta g$ is sample-dependent and ranges from 0.042 to 0.115.

5 pages, 4 figures. Accepted and in press, Nano Letters

References in corpus (4)

• Valley polarization in MoS2 monolayers by optical pumping
• Robust optical emission polarization in MoS2 monolayers through selective valley excitation
• Exciton Valley Dynamics probed by Kerr Rotation in WSe2 Monolayers
• Spin coherence of a two-dimensional electron gas induced by resonant excitation of trions and excitons in CdTe/(Cd,Mg)Te quantum wells

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