Gregor Wentzel
We review the life and remarkable contributions to Physics of Gregor Wentzel.
physics.hist-ph↗
arXiv subjects
Yoichiro Nambu
Publications and source records attributed to Yoichiro Nambu.
The Aharonov-Bohm Problem Revisited
The properties of a nonrelativistic charged particle in two dimensions in the presence of an arbitrary number of nonquantized magnetic fluxes are investigated in free space as well as in a uniform magnetic field. The fluxes are represented mathematically as branch points in one of the complex coordinates. It is found that in order to construct solutions, the fluxes have to be treated in general as dynamical objects dual to the charges. A medium made up of fluxes acts like an anti-magnetic field and tends to expel the charges.
hep-th↗
Feedback Effects in Superconductors
We calculate corrections to the BCS gap equation caused by the interaction of electrons with the collective phase and amplitude modes in the superconducting state. This feedback reduces the BCS gap parameter, $Δ$, and leaves the critical temperature, $T_c$, unchanged. The feedback effect is proportional to $(Δ/ {\scriptstyle{\cal E}_F})^2$, where ${\scriptstyle{\cal E}_F}$ is the Fermi energy. This is a negligible correction for type-I superconductors. However in type-II superconductors the feedback effect is greatly enhanced due to smaller Fermi velocities, $v_F$, and may be responsible for effects seen in recent experimental data on organic superconductors.
cond-mat↗