QFS2016 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

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

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.