Journal
JETP LETTERS
Volume 90, Issue 8, Pages 587-591Publisher
MAIK NAUKA/INTERPERIODICA/SPRINGER
DOI: 10.1134/S0021364009200089
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Funding
- Academy of Finland [06-02-16002-a]
- Russian Foundation for Basic Research
- Khalatnikov-Starobinsky leading scientific school [4899.2008.2]
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We consider topological invariant describing the vacuum states of superfluid He-3-B, which belongs to the special class of time-reversal 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 He-3-B 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.
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