QFS 2016 Book of Abstracts

Abstracts

P2.1 Chiral magnetic effect in a two-band lattice model of Weyl semimetal Ming-Che Chang(1), Min-Fong Yang(2) 1) National Taiwan Normal University, Taipei, Taiwan 2) Tunghai University, Taichung, Taiwan Employing a two-band model of Weyl semimetal, the existence of the chiral magnetic effect (CME) is established within the linear-response theory. The crucial role played by the limiting procedure in deriving correct transport properties is clarified. Besides, in contrast to the prediction based on linearized effective models, the value of the CME coefficient in the uniform limit shows a nontrivial dependence on various model parameters. Furthermore, we show that the Weyl nodes are not required for the CME in a clean, infinite system. Similar to the anomalous Hall effect, the CME results directly from the Berry curvature of energy bands, even when there is no monopole source from the Weyl nodes. P2.2 Behaviour of multielectron bubbles in liquid helium pressed against thin solid films Joseph Emil Mathew(1), Vadakkumbatt Vaisakh(2), Ghosh Ambarish(1,2) 1) Indian Institute of Science, Centre for Nano Science and Engineering, Bangalore, India, 560012. 2) Indian Institute of Science, Department of Physics, Bangalore, India, 560012. A Multielectron bubble (MEB) is a cavity formed inside liquid helium with a layer of electrons confined to its inner surface. Here we describe an experiment to study the behaviour of MEBs pressed against a charge collection electrode, where the electrode was covered with thin films of different materials, comprising of both metals and dielectrics. Preliminary analysis of the experimental data suggests that MEBs lose their charge in a time scale of seconds when they are held against the thin film. We suspect that quantum tunnelling of electrons through the thin layer of helium between the MEB and the thin film plays the dominant role in determining the charge loss mechanism.

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