[Tu-A2-B] Optical properties in 2D materials

11:45 AM - 12:00 PM JST(2:45 AM - 3:00 AM UTC)

[Tu-A2-B-04] Probing Wigner Crystallization in a WSe₂ Heterostructure with Four-Wave Mixing

Jin-Woo Jung^2,1, Jungwon Kim^1,2, Seong-Yeon Lee¹, Kwangseuk Kyhm², Tomasz Smolenski³, Gilles Nogues¹, Julien Renard¹, 〇Jacek Kasprzak^1,4,5 (1. Institut Néel, CNRS (France), 2. PNU (Korea), 3. University of Basel (Switzerland), 4. University of Tsukuba (Japan), 5. University of Warsaw (Poland))

We employ four-wave mixing microscopy to study an electrostatically gated WSe₂ monolayer. We measure the dephasing and coherent couplings of polarons as the doping density varies. Focusing on the formation of the Wigner crystal, we detect umklapp branches directly in the four-wave mixing spectra.