Femtosecond valley polarization and topological resonances in transition metal dichalcogenides

S. Azar Oliaei Motlagh*, Jhih-Sheng Wu, Vadym Apalkov, Mark Stockman

*此作品的通信作者

研究成果: Article同行評審

18 引文 斯高帕斯(Scopus)

摘要

We theoretically introduce the fundamentally fastest induction of a significant population and valley polarization in a monolayer of a transition metal dichalcogenide (i.e., MoS2 and WS2). This may be extended to other two-dimensional materials with the same symmetry. This valley polarization can be written and read out by a pulse consisting of just a single optical oscillation with a duration of a few femtoseconds and an amplitude of similar to 0.25 V/angstrom. Under these conditions, we predict an effect of topological resonance, which is due to the Bloch motion of electrons in the reciprocal space where electron population textures are formed due to non-Abelian Berry curvature. The predicted phenomena can be applied for information storage and processing in PHz-band optoelectronics.

原文English
文章編號081406
頁數6
期刊Physical Review B
98
發行號8
DOIs
出版狀態Published - 15 八月 2018

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