Many-Body Topological Invariants for Fermionic Symmetry-Protected Topological Phases
Many-Body Topological Invariants for Fermionic Symmetry-Protected Topological Phases
We define and compute many-body topological invariants of interacting fermionic symmetry-protected topological phases, protected by an orientation-reversing symmetry, such as time-reversal or reflection symmetry. The topological invariants are given by partition functions obtained by a path integral on unoriented spacetime which, as we show, can be computed for a given …