Tuesday, February 28, 2012

1202.5969 (Masaki Tezuka et al.)

Reentrant topological transitions in a one-dimensional quantum wire
coupled to superconductor with quasiperiodic lattice modulation
   [PDF]

Masaki Tezuka, Norio Kawakami
We study the condition for a topological superconductor (TS) phase with edge Majorana fermions to appear when a quasiperiodic lattice modulation is applied to a one-dimensional quantum wire with strong spin-orbit interaction situated under a magnetic field and in proximity to a superconductor. By density-matrix renormalization group analysis we find that multiple topological phases with Majorana edge modes are realized in finite ranges of the filling factor, showing a sequence of reentrant transitions. An on-site interaction stabilizes the topological phases, as observed for systems without lattice modulation in [E. M. Stoudenmire, J. Alicea, O. A. Starykh, and M. P. A. Fisher, Phys. Rev. B 84, 014503 (2011)]. The stability of the TS in the presence of a harmonic trap potential is also discussed.
View original: http://arxiv.org/abs/1202.5969

No comments:

Post a Comment