1. two-dimensional quantum fluids in gaas-based semiconductors

Hyoungsoon Choi

KAIST, Korea

14 April 2022 Thu 4 pm

                                      IBS Center for Theoretical Physics of Complex Systems (PCS), Administrative Office (B349), Theory Wing, 3rd floor

                                      Expo-ro 55, Yuseong-gu, Daejeon, South Korea, 34126 Tel: +82-42-878-8633                     

Quantum fluids are macroscopic manifestation of quantum a behavior often times facilitated by reducing temperatures of a system. GaAs quantum well has long been a prototypical example of two-dimensional electron gas (2DEG) owing to high quality samples available from molecular beam epitaxy (MBE) growth. The GaAs 2DEG under small magnetic field behaves very much like a 2D Fermi liquid described by a non-interacting electrons with effective mass of m* < 0.1m_e. A similar system can also be used to study bosonic quantum fluids as well by forming excitons or exciton-polaritons rather than electrons. Superfluidity or Bose-Einstein condensation, hallmark signatures of a bosonic quantum fluid, is indeed observed in such a system. In this talk, I will present our effort to better understand both the fermionic and boson quantum fluids in these systems explored by transverse magneto-focusing of electrons, and single quantized vortex generation in exciton-polaritons.