
VOLUME 90  ISSUE 8 
PAGE 639

Topological invariant for superfluid ^{3}HeB and quantum phase transitions

G. E. Volovik
Low Temperature Laboratory, Helsinki University of Technology, FIN02015 HUT, Finland Landau Institute for Theoretical Physics RAS, 119334 Moscow, Russia

PACS: 71.23.An

Abstract
We consider topological invariant describing the vacuum
states of superfluid ^{3}HeB,
which belongs
to the special class of timereversal invariant topological insulators
and superfluids.
Discrete symmetries important for classification of the topologically
distinct vacuum states
are discussed.
One of them leads to the additional subclasses of ^{3}HeB states and
is responsible for
the finite density of states of Majorana fermions living
at some interfaces between the bulk states.
Integer
valued topological invariant is expressed in terms of the Green's function,
which allows us
to consider systems with interaction.


Download PS file (GZipped, 98.7K)

Download PDF file (194.9K)


Список работ, цитирующих данную статью, см. здесь.
List of articles citing this article can be found here.

