QFS 2016 Book of Abstracts

Abstracts

P1.37 Coupling of the Wigner Crystal with Liquid Helium 4 under Sliding Condition Sato Daisuke(1), Ikegami Hiroki(1), Okuda Yuichi(1), Kono Kimitoshi(1,2,3) 1) RIKEN, the Center for Emergent Matter Science, Wako, Saitama 351-0198, Japan 2) National Chiao Tung University, Institute of Physics, Hsinchu 30010, Taiwan 3) Kazan Federal University, Institute of Physics, Kazan 420008, Russia A Wigner crystal (WC), a two-dimensional electron solid, trapped on liquid 4 He is coupled with surface excitations of the liquid. And it shows resonance modes called “coupled plasmon-ripplon (CPR) modes”. We measured the frequency change of the CPR modes before and after the sliding of the WC occurs, which is induced by applying ac electric field by corbino electrodes. The resonance frequencies jump at the sliding point. This is due to drastic change of the coupling between the WC and liquid 4 He surface because the periodic dimples on liquid surface, which are placed just below WC electrons, disappears when the sliding occurs. We also discuss about the critical behavior. P1.38 Effective mass calculations for a two-dimensional dipolar fermion gas Seydi I.(1), Abedinpour S.H.(1), Tanatar B.(2)* (1) Department of Physics, Institute for Advanced Studies in Basic Science (IASBS), Zanjan, Iran (2) Department of Physics, Bilkent University, Ankara, Turkey We consider a two-dimensional spin-polarized system of atomic or molecular gas of dipolar fermions with dipole moments aligned in the perpendicular direction. We use the static structure factor information from quantum Monte Carlo simulations and from variational ground-state calculations to obtain effective (many-body) dipole-dipole interaction. We calculate the many-body effective mass of the system within the G0W approximation to the self-energy. The role played by density fluctuations in the calculated effective mass as a function of interaction strength is assessed.

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