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TT: Fachverband Tiefe Temperaturen
TT 35: Focus Session: Correlations in Moiré Quantum Matter I
TT 35.1: Invited Talk
Wednesday, March 29, 2023, 15:00–15:30, HSZ 03
Strongly correlated excitons in atomic double layers — •Phuong Nguyen1, Liguo Ma1, Raghav Chaturvedi1, Kenji Watanabe2, Takashi Taniguchi2, Kin Fai Mak1,3,4, and Jie Shan1,3,4 — 1School of Applied and Engineering Physics, Cornell University, Ithaca, NY, USA — 2National Institute for Materials Science, Tsukuba, Japan — 3Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca, NY, USA — 4Kavli Institute at Cornell for Nanoscale Science, Ithaca, NY, USA
Excitons (bound electron-hole pairs) in solids have been proposed as a platform to achieve high temperature Bose-Einstein condensation. The small exciton binding energy in conventional semiconductors has limited the condensation temperature to about 1 K. In the past several years, a new class of two-dimensional semiconductors with much larger exciton binding energy has emerged. In this talk, we discuss the development of transition metal dichacogenide double layer structures and electrical injection of interlayer excitons up to 1012 cm−2. We establish electrical control of the chemical potential of interlayer excitons and probe their thermodynamic properties by capacitance measurements. We present experimental evidence for an excitonic insulating state and discuss the possibility of probing exciton superfluidity in the atomic double layer system.