Low Temperature Physics: 46, 420 (2020); https://doi.org/10.1063/10.0000875
Vortex generation in a superfluid gas of dipolar chains in crossed electric and magnetic fields
D.V. Fil1,2 and S.I. Shevchenko3
1Institute for Single Crystals, National Academy of Sciences of Ukraine, 60 Nauky Ave., Kharkiv 61072, Ukraine
2V.N. Karazin Kharkiv National University, 4 Svobody Square, Kharkiv 61022, Ukraine
3B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Nauky Ave., Kharkiv 61103, Ukraine
Received November 25, 2019, published online February 28, 2020
Crossed electric and magnetic fields influence dipolar neutral particles in the same way as the magnetic field influences charged particles. The effect of crossed fields is proportional to the dipole moment of the particle (inherent or induced). We show that this effect is quite spectacular in a multilayer system of polar molecules. In this system molecules may bind in chains. At low temperature the gas of chains becomes the superfluid one. The crossed fields then induce vortices in the superfluid gas of chains. The density of vortices is proportional to the number of particles in the chain. The effect can be used for monitoring the formation and destruction of chains in multilayer dipolar gases.
Key words: dipolar gases, multilayer systems, crossed fields, quantum vortices.