Noah Bray-ali 博士

Topological order in two-dimensional fermion systems with p+ip pairing

Abstract:
We numerically evaluate the ``entanglement spectrum'' (singular value decomposition of the wavefunction) of paired states of fermions in two dimensions that break parity and time-reversal symmetries, focusing on the spinless, p+ip case. In the weak-pairing phase, the low-lying entanglement spectrum has a gapless structure, which we compare to that of the Moore-Read state, a non-Abelian quantum hall fluid. In the strong-pairing phase, we find a different structure, which we compare to the s-wave case. At the weak-strong transition, we compute the entanglement entropy from the spectrum, and find a logarithmic correction to the generic, ``area'' law behavior.

2009 年 4 月 17 日
15:40~16:40

RM112, New Physics Building