TY  - JOUR
A1  - Budich, Jan Carl
A1  - Trauzettel, Björn
T1  - Z(2) Green's function topology of Majorana wires
JF  - New Journal of Physics
N2  - We represent the Z2 topological invariant characterizing a one-dimensional topological superconductor using a Wess–Zumino–Witten dimensional extension. The invariant is formulated in terms of the single-particle Green’s function which allows us to classify interacting systems. Employing a recently proposed generalized Berry curvature method, the topological invariant is represented independent of the extra dimension requiring only the single-particle Green’s function at zero frequency of the interacting system. Furthermore, a modified twisted boundary conditions approach is used to rigorously define the topological invariant for disordered interacting systems.
KW  - Green's function
Y1  - 2013
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-129751
VL  - 15
IS  - 065006
ER  -