QFS2016 Book of Abstracts

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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