Coherent spin dynamics of excitons in strained monolayer semiconductors

Autor:	Mikhail Glazov
Rok vydání:	2022
Předmět:	Condensed Matter - Other Condensed Matter Condensed Matter - Materials Science Condensed Matter - Mesoscale and Nanoscale Physics Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Materials Science (cond-mat.mtrl-sci) FOS: Physical sciences Other Condensed Matter (cond-mat.other)
Zdroj:	Physical Review B. 106
ISSN:	2469-9969 2469-9950
DOI:	10.1103/physrevb.106.235313
Popis:	We develop a model of the coherent exciton spin-valley dynamics in two-dimensional transition metal dichalcogenides under elastic strain. The strain splits the exciton radiative doublet in linearly polarized states. Consequently, it induces an effective magnetic field acting on the exciton pseudospin and causes its precession. As a result, under circularly polarized excitation, the circular polarization of excitons oscillates with time, also a time-oscillating linear polarization appears. We study competition of the strain-induced effective magnetic field with the field caused by the exciton longitudinal-transverse splitting. We uncover different regimes of coherent spin dynamics of two-dimensional excitons. In particular, we show that for sufficiently large strain-induced and longitudinal-transverse splittings two frequencies related to these splittings appear in the exciton circular polarization beats. Comment: 9 pages, 3 figures, for the Physical Review B special issue "Spin-Coherent Phenomena in Semiconductors" in honor of E. I. Rashba
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cdf43fdd30b2967c80b0a6670fee7eab https://doi.org/10.1103/physrevb.106.235313 Zobrazit plný text záznamu