Paired composite fermion phase of quantum Hall bilayers at nu=1/2+1/2.
We provide numerical evidence for composite fermion pairing in quantum Hall bilayer systems at filling nu=1/2+1/2 for intermediate spacing between the layers. We identify the phase as p_(x)+ip_(y) pairing, and construct high accuracy trial wave functions to describe the ground state on the sphere. For large distances between the layers, and for finite systems, a competing "Hund's rule" state, or composite fermion liquid, prevails for certain system sizes.
Möller
Gunnar
G
Theory of Condensed Matter Group, Cavendish Laboratory, J. J. Thomson Avenue, Cambridge, United Kingdom.
Simon
Steven H
SH
Rezayi
Edward H
EH