Dresden 2020 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 22: 2D Materials and their Heterostructures I (joint session DS/HL/O)
HL 22.2: Vortrag
Dienstag, 17. März 2020, 09:45–10:00, CHE 89
Spin-Sensitive Readout of Two-Dimensional Wigner Crystals in Transition-Metal Dichalcogenides — •Johannes Knörzer1,2, Martin Schuetz3, Geza Giedke4,5, Dominik Wild3, Kristiaan de Greve3, Richard Schmidt1,2, Mikhail Lukin3, and Ignacio Cirac1,2 — 1Max-Planck-Institut für Quantenoptik, Garching, Germany — 2Munich Center for Quantum Science and Technology, München, Germany — 3Physics Department, Harvard University, Cambridge, USA — 4Donostia International Physics Center, San Sebastián, Spain — 5Ikerbasque Foundation for Science, Bilbao, Spain
Wigner crystals are prime candidates for the realization of regular electron lattices under minimal requirements on external control and electronics. However, technical challenges have prevented their detailed experimental investigation to date. Here we propose an implementation of two-dimensional electron lattices for quantum simulation based on self-assembled Wigner crystals in transition-metal dichalcogenides. We show that these semiconductors allow for minimally invasive all-optical detection schemes of charge ordering and total spin. For incident light with optimally chosen beam parameters and polarization, we predict a strong dependence of the transmitted and reflected signals on the underlying lattice periodicity, thus revealing the charge order inherent in Wigner crystals. At the same time, the selection rules in transition-metal dichalcogenides provide direct access to the spin degree of freedom via Faraday rotation measurements.