Spontaneous Exciton Valley Coherence in Transition Metal Dichalcogenide Monolayers Interfaced with an Anisotropic Metasurface

Pankaj K. Jha, Nir Shitrit, Xuexin Ren, Yuan Wang, Xiang Zhang

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

The control of the exciton intervalley coherence renders transition metal dichalcogenides monolayers promising candidates for quantum information science. So far, generating intervalley coherence has the need for an external coherent field. Here, we theoretically demonstrate spontaneous generation (i.e., without any external field) of exciton intervalley coherence. We achieve this by manipulating the vacuum field in the vicinity of the monolayer with a designed polarization-dependent metasurface, inducing an anisotropic decay rate for in-plane excitonic dipoles. Harnessing quantum coherence and interference effects in two-dimensional materials may provide the route for novel quantum valleytronic devices.

Original languageEnglish
Article number116102
JournalPhysical Review Letters
Volume121
Issue number11
DOIs
StatePublished - 11 Sep 2018
Externally publishedYes

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