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Title: Breakdown of electron-pairs in the presence of an electric field of a superconducting ring
Authors: Pandey, Bradraj
Dutta, Sudipta
Pati, Swapan Kumar
Keywords: Physics
superconducting ring
time-dependent Aharonov-Bohm flux
exact diagonalization and Crank-Nicolson
J-Like Hamiltonians
Magnetic Flux
Issue Date: 2016
Publisher: IoP Publishing Ltd
Citation: Pandey, B.; Dutta, S.; Pati, S. K., Breakdown of electron-pairs in the presence of an electric field of a superconducting ring. Journal of Physics-Condensed Matter 2016, 28 (19), 6
Journal of Physics-Condensed Matter
Abstract: The quantum dynamics of quasi-one-dimensional ring with varying electron filling factors is investigated in the presence of an external electric field. The system is modeled within a Hubbard Hamiltonian with attractive Coulomb correlation, which results in a superconducting ground state when away from half-filling. The electric field is induced by applying time-dependent Aharonov-Bohm flux in the perpendicular direction. To explore the non-equilibrium phenomena arising from the field, we adopt exact diagonalization and the Crank-Nicolson numerical method. With an increase in electric field strength, the electron pairs, a signature of the superconducting phase, start breaking and the system enters into a metallic phase. However, the strength of the electric field for this quantum phase transition depends on the electronic correlation. This phenomenon has been confirmed by flux-quantization of time-dependent current and pair correlation functions.
Description: Restricted Access
ISSN: 0953-8984
Appears in Collections:Research Articles (Swapan Kumar Pati)

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