Manipulating valley-sensitive light-matter states in monolayer transition metal dichalcogenides

Yen Jung Chen, Trevor Lamountain, Teodor K. Stanev, Nathaniel P. Stern*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Control over the interactions between light and matter underlies many classical and quantum applications. In recent years, 2D layered semiconductors have gained prominence for optoelectronics because of their strong excitonic effects and capacity for van der Waals assembly. One of the unique features of these monolayer materials, the valley pseudospin, can be manipulated by controlling the local properties of optical fields. Here, we discuss two manifestations of this optical control across different regimes of coupling. In a strongly coupled regime, we discuss the dynamics of valley-polarized hybrid light-matter states, or exciton-polaritons, in a monolayer MoS2 embedded in a microcavity. Different dynamics of valley-polarized exciton-polaritons can be accessed with microcavity engineering by tuning system parameters such as cavity decay rate and exciton-photon coupling strength. Comparison of predictions and measurements demonstrate the ability to intentionally modify exciton-polariton valley characteristics, illustrating the microcavity as a tool for manipulating and engineering valley dynamics in 2D materials. In the weak coupling regime optical selection rules give rise to the valley-selective optical Stark shift. We discuss recent advances in probing this effect with improved sensitivity. Both of these complementary approaches show how the valley structure of monolayer materials yield interesting light-matter phenomena that allow tuning of optical properties.

Original languageEnglish (US)
Title of host publication2D Photonic Materials and Devices II
EditorsHui Deng, Carlos M. Torres, Arka Majumdar
PublisherSPIE
ISBN (Electronic)9781510624825
DOIs
StatePublished - 2019
Event2D Photonic Materials and Devices II 2019 - San Francisco, United States
Duration: Feb 6 2019Feb 7 2019

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume10920
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

Conference2D Photonic Materials and Devices II 2019
Country/TerritoryUnited States
CitySan Francisco
Period2/6/192/7/19

Keywords

  • 2D materials
  • Exciton-polaritons
  • Kerr rotation
  • Stark effect
  • Valley pseudospin

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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