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Abstracts
P2.3
Quantum Phase Transition in the Electron-Hole Liquid in the Coupled
Quantum Wells
Babichenko Vladimir, Polishchuk Ilya
National Research Center Kurchatov Institute, Moscow, 123182, Russia
Many-component electron-hole plasma is considered in the Coupled Quantum
Wells (CQW). It is found that the homogeneous state of the plasma is unstable
if the carrier concentration is sufficiently small. Instead, the electron-hole
liquid drops appears. A homogeneous electron-hole liquid state is stable if the
distance between the quantum wells L is small. However, as the distance L
increases and reaches a certain critical value Lcr, the plasmon spectrum of the
electron-hole liquid becomes unstable, what results in the appearance of the
charge density waves of a finite amplitude in both quantum wells. An effective
mass renormalization is considered, and the strong mass renormalization is found
for the electron-hole liquid after the quantum phase transition occurs.
P2.4
A proposal for detecting edge current in px+ipy topological superfluid
3
He
Jeong(1,2), Kim(2), Byun(1), Kim(1) Sim(2), Suh(2), Choi(1)
1) KAIST, College of Natural Sciences, Department of physics, 291, Daehak-ro,
Yuseong-gu,Daejeon, Korea
2) KRISS, Center for quantum measurement, 267, Gajeong-ro, Yuseong-gu,
Daejeon, Korea
Superfluid
3
He is a natural candidate for studying topological superfluidity (TSF)
as it is the only fully confirmed p-wave superfluid/superconductor in existence. It
is especially powerful for such a purpose in the sense that it hosts different types
of TSFs in a single material: from time reversal invariant TSF in bulk
3
He-B to
time reversal broken
p
+
ip
TSF in
3
He-A and polar phase can all be seen within
it when properly configured. Despite such strengths in superfluid
3
He, no true
topological signature has been established due to lack of realistic measurement
scheme. We propose a method for detecting one of the topological signatures, i.e.
the angular momentum generated by the edge current of two dimensional
p
+
ip
3
He-A. A micromechanical gyroscope is being developed for the measurement,
and we report on our progress.
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