Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2011-02-22
Phys. Rev. B 83, 125429 (2011)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
11 pages, 12 figures, to appear in Physical Review B (2011)
Scientific paper
We consider the energy spectrum and the spin-parity structure of the eigenstates for a quantum dot made of a strong topological insulator. Using the effective low-energy theory in a finite-length cylinder geometry, numerical calculations show that even at the lowest energy scales, the spin direction in a topologically protected surface mode is not locked to the surface. We find "zero-momentum" modes, and subgap states localized near the "caps" of the dot. Both the energy spectrum and the spin texture of the eigenstates are basically reproduced from an analytical surface Dirac fermion description. Our results are compared to microscopic calculations using a tight-binding model for a strong topological insulator in a finite-length nanowire geometry.
Egger Reinhold
Kundu Anjan
Martin Tara
Yeyati Alfredo Levy
Zazunov Alex
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