Distinct properties of vortex bound states driven by temperature

We investigate the behavior of vortex bound states in the quantum limit by self-consistently solving the Bogoliubov-de Gennes equation.\revision{We find that the energies of the vortex bound states deviates from the analytical result $E_\mu=\mu\Delta^2/E_F$ with the half-integer angular momentum $\mu$ at very low temperature. Specifically, the energy ratio for the first three orders is more close to $1:2:3$ instead of $1:3:5$ in the extreme quantum limit $T/T_c\ll\Delta/E_F$.} The local density of states reveals a Friedel-like behavior associated with that of the pair potential, which will be smoothed out by thermal effect above the quantum limit. Our studies show that the vortex bound states can exhibit very distinct features in different temperature regimes, which provides a comprehensive understanding and should stimulate more experimental efforts for verifications.

Switchable Purcell enhancement of photoluminescence by GST film

In the present paper perovskite radiation enhancement on crystalline GST film compared to amorphous one has been studied. The photonic local density of states has been calculated by angular spectrum representation of the dyadic Green’s function. The Purcell factor has been calculated for perovskite luminescent on both amorphous and crystalline GST film. Almost 80% enhancement has been observed at wavelength 950 nm for system with perovskite thickness 25 nm, GST thickness 110 nm.