Effective Vortex Mass from Microscopic Theory

Details Effective Vortex Mass from Microscopic Theory Effective Vortex Mass from Microscopic Theory

2004-07-07

arxiv.org/abs/cond-mat/0407156v2

Physics

Condensed Matter

Superconductivity

Supercedes prior version, cond-mat/9903125

Scientific paper

10.1103/PhysRevB.71.125108

We calculate the effective mass of a single quantized vortex in the BCS superconductor at finite temperature. Based on effective action approach, we arrive at the effective mass of a vortex as integral of the spectral function $J(\omega)$ divided by $\omega^3$ over frequency. The spectral function is given in terms of the quantum-mechanical transition elements of the gradient of the Hamiltonian between two Bogoliubov-deGennes (BdG) eigenstates. Based on self-consistent numerical diagonalization of the BdG equation we find that the effective mass per unit length of vortex at zero temperature is of order $m (k_f \xi_0)^2$ ($k_f$=Fermi momentum, $\xi_0$=coherence length), essentially equaling the electron mass displaced within the coherence length from the vortex core. Transitions between the core states are responsible for most of the mass. The mass reaches a maximum value at $T\approx 0.5 T_c$ and decreases continuously to zero at $T_c$.

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