Is there a finite temperature phase transitions in bilayer quantum Hall system ? – Jinwu Ye

Date: Mon. October 20th, 2003, 12:30 pm-1:30 pm
Location: Rockefeller 221

A Mutual Composite Fermion (MCF) picture is proposed to explain the interlayer coherent incompressible phase in bilayer Quantum Hall systems at total filling factor ν_T=ν₁+ν₂ =1. There are gapped quasi-particles (QP) and quasi-holes (QH) excitations with total fractional charges ±ν₁ and ±ν₂. The total fractional charges are evenly distributed between the two layers. The QP and QH are asymptotically free even at T=0 . In contrast to previous claims, there is no finite temperature phase transition. Our results are contrasted with previous results from different pictures. Experimental implications are given.