Electromagnetic radiation from vortex flow in Type-II superconductors.
We show that a moving vortex lattice, as it comes to a crystal edge, radiates into a free space the harmonics of the washboard frequency, omega(0)=2pi v/a, up to a superconducting gap, Delta/variant Planck's over 2pi. Here v is the velocity of the vortex lattice and a is the intervortex spacing. We compute radiation power and show that this effect can be used for the generation of terahertz radiation and for characterization of moving vortex lattices.
Bulaevskii
L N
LN
Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
Chudnovsky
E M
EM