Schliemann J, Girvin S M, MacDonald A H
Department of Physics, Indiana University, Bloomington, Indiana 47405-7105, USA.
Phys Rev Lett. 2001 Feb 26;86(9):1849-52. doi: 10.1103/PhysRevLett.86.1849.
At small layer separations, the ground state of a nu = 1 bilayer quantum Hall system exhibits spontaneous interlayer phase coherence. The evolution of this state with increasing layer separation d has been a matter of controversy. We report on small system exact diagonalization calculations which suggest that a single-phase transition, likely of first order, separates incompressible states with strong interlayer correlations from compressible states with weak interlayer correlations. We find a dependence of the phase boundary on d and interlayer tunneling amplitude that is in very good agreement with recent experiments.
在较小的层间距下，ν = 1双层量子霍尔系统的基态呈现出自发的层间相位相干性。这种状态随层间距d增加的演化一直存在争议。我们报告了小系统精确对角化计算结果，结果表明一个可能是一级的单一相变将具有强层间相关性的不可压缩态与具有弱层间相关性的可压缩态区分开来。我们发现相界对d和层间隧穿振幅的依赖性与最近的实验非常吻合。
