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VOLUME 66 (1997) | ISSUE 7 | PAGE 492
On edge states in superconductor with time inversion symmetry breaking
Superconducting states with different internal topology are discussed for the layered high-Tc materials. If the time inversion symmetry is broken, the superconductivity is determined not only by the symmetry of the superconducting state, but also by the topology of the ground state. The latter is determined the integer-valued momentum-space topological invariant TV. The current carrying boundary between domains with different iV (jV2 φ N\) is considered. The current is produced by fermion zero modes, which number per one layer is 2(N2 N\). PACS: 11.27.+d, 74.20.-z, 74.80.-g