Optical Manipulation of Layer–Valley Coherence via Strong Exciton–Photon Coupling in Microcavities
Abstract
Coherent control and manipulation of quantum degrees of freedom such as spins forms the basis of emerging quantum technologies. In this context, the robust valley degree of freedom and the associated valley pseudospin found in two‐dimensional transition metal dichalcogenides is a highly attractive platform. Valley polarization and coherent superposition of valley states have been observed in these systems even up to room temperature. Control of valley coherence is an important building block for the implementation of valley qubit. Large magnetic fields or high‐power lasers have been used in the past to demonstrate the control (initialization and rotation) of the valley coherent states. Here, the control of layer–valley coherence via strong coupling of valley excitons in bilayer WS2 to microcavity photons is demonstrated by exploiting the pseudomagnetic field arising in optical cavities owing to the transverse electric–transverse magnetic (TE–TM)mode splitting. The use of photonic structures to generate pseudomagnetic fields which can be used to manipulate exciton‐polaritons presents an attractive approach to control optical responses without the need for large magnets or high‐intensity optical pump powers.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Apr 07, 2023
- Source ID
- 10.1002/adom.202202631
Entities
People
- Areg Ghazaryan
- Kausik Majumdar
- Mandeep Khatoniar
- Nicholas Yama
- Pouyan Ghaemi
- Sriram Guddala
- Vinod Menon
Organizations
- Army Research Office
- City College of New York
- City University of New York
- Indian Institute of Science, Bengaluru
- Institute of Science and Technology Austria
- National Science Foundation
- University of Washington