Exciton valley dynamics probed by Kerr rotation in WSe2 monolayers
By C. Zhu, K. Zhang, M. Glazov, Bernhard Urbaszek, T. Amand, Z. Ji, B. Liu, Xavier Marie. 2014
237 citations recorded by the source corpus.
We have experimentally studied the pump-probe Kerr rotation dynamics in WSe2 monolayers. This yields a direct measurement of the exciton valley depolarization time tau(nu). At T = 4 K, we find tau(nu) approximate to 6 ps, a fast relaxation time resulting from the strong electron-hole Coulomb exchange interaction in bright excitons. The exciton valley depolarization time decreases significantly when the lattice temperature increases, with tau(nu) being as short as 1.5 ps at 125 K. The temperature dependence is well explained by the developed theory, taking into account the exchange interaction and fast exciton scattering time on the short-range potential.
Subfields: Electrical and Electronic Engineering, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/54d7318149df03bcf4d8da90a1ae08d52d2a60ba
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In Electrical and Electronic Engineering
In Materials Chemistry
Citations in the corpus
- Optical properties of atomically thin transition metal dichalcogenides: observations and puzzles (2016, background): “[106] Zhu CR, Zhang K, Glazov M, Urbaszek B, Amand T, Ji ZW, Liu BL, Marie X.”
- Long-lived nanosecond spin relaxation and spin coherence of electrons in monolayer MoS2 and WS2 (2015, background): “Very recent studies of monolayer MoS2 and WSe2 using related optical techniques did not reveal any longlived polarization imparted to resident electrons, perhaps due to elevated temperatures [13] or to the use of probe photons with higher energy [11, 12].”