Kavli Affiliate: Michael F. Crommie
| First 5 Authors: Ruishi Qi, Qize Li, Zuocheng Zhang, Zhiyuan Cui, Bo Zou
| Summary:
Excitonic insulators represent a unique quantum phase of matter, providing a
rich ground for studying exotic quantum bosonic states. Strongly coupled
electron-hole bilayers, which host stable dipolar exciton fluids with an
exciton density that can be adjusted electrostatically, offer an ideal platform
to investigate correlated excitonic insulators. Based on electron-hole bilayers
made of MoSe2/hBN/WSe2 heterostructures, here we study the behavior of
excitonic insulators in a perpendicular magnetic field. We report the
observation of excitonic quantum oscillations in both Coulomb drag signals and
electrical resistance at low to medium magnetic fields. Under a strong magnetic
field, we identify multiple quantum phase transitions between the excitonic
insulator phase and the bilayer quantum Hall insulator phase. These findings
underscore the interplay between the electron-hole interactions and Landau
level quantization that opens new possibilities for exploring quantum phenomena
in composite bosonic insulators.
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