Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Andreev bound states for cake shape superconducting-normal system
AU - Cserti, József
AU - Beri, Benjamin
AU - Kormanyos, Andor
AU - Pollner, Peter
AU - Kaufmann, Z.
PY - 2004/9/22
Y1 - 2004/9/22
N2 - The energy spectrum of cake shape normal–superconducting systems is calculated by solving the Bogoliubov–de Gennes equation. We take into account the mismatch in the effective masses and Fermi energies of the normal and superconducting regions as well as the potential barrier at the interface. In the case of a perfect interface and without mismatch, the energy levels are treated by semi-classics. Analytical expressions for the density of states and its integral, the step function, are derived and compared with that obtained from exact numerics. We find a very good agreement between the two calculations. It is shown that the spectrum possesses an energy gap and the density of states is singular at the edge of the gap. The effect of the mismatch and the potential barrier on the gap is also investigated.
AB - The energy spectrum of cake shape normal–superconducting systems is calculated by solving the Bogoliubov–de Gennes equation. We take into account the mismatch in the effective masses and Fermi energies of the normal and superconducting regions as well as the potential barrier at the interface. In the case of a perfect interface and without mismatch, the energy levels are treated by semi-classics. Analytical expressions for the density of states and its integral, the step function, are derived and compared with that obtained from exact numerics. We find a very good agreement between the two calculations. It is shown that the spectrum possesses an energy gap and the density of states is singular at the edge of the gap. The effect of the mismatch and the potential barrier on the gap is also investigated.
U2 - 10.1088/0953-8984/16/37/009
DO - 10.1088/0953-8984/16/37/009
M3 - Journal article
VL - 16
JO - Journal of Physics: Condensed Matter
JF - Journal of Physics: Condensed Matter
SN - 1361-648X
IS - 37
M1 - 6737
ER -