Abstract
We study the motion of an electron bubble in the zerotemperature limit where neither phonons nor rotons provide a significant contribution to the drag exerted on an ion moving within the superfluid. By using the GrossClark model, in which a GrossPitaevskii equation for the superfluid wave function is coupled to a Schrödinger equation for the electron wave function, we study how vortex nucleation affects the measured drift velocity of the ion. We use parameters that give realistic values of the ratio of the radius of the bubble with respect to the healing length in superfluid ^{4}He at a pressure of one bar. By performing fully threedimensional spatiotemporal simulations of the superfluid coupled to an electron, that is modeled within an adiabatic approximation and moving under the influence of an applied electric field, we are able to recover the key dynamics of the ionvortex interactions that arise and the subsequent ionvortex complexes that can form. Using the numerically computed drift velocity of the ion as a function of the applied electric field, we determine the vortex nucleation limited mobility of the ion to recover values in good agreement with measured data.
Original language  English 

Article number  094507 
Journal  Physical Review B 
Volume  97 
DOIs  
Publication status  Published  13 Mar 2018 
Profiles

Hayder Salman
 School of Mathematics  Associate Professor in Applied Mathematics
 Quantum Fluids  Member
Person: Research Group Member, Academic, Teaching & Research