Motional dressed states in a bose-einstein condensate: superfluidity at supersonic speed
We present an exact analytic solution of a nonlinear Schrodinger field interacting with a moving potential (obstacle) at supersonic speed. We discover conditions under which the field can form a stable shape-invariant structure localized around the obstacle-a dressing effect that protects the field against excitations by the obstacle. Such an effect demonstrates the existence of frictionless motion beyond the conventionally defined critical velocity.
Law
CK
Department of Physics, The Chinese University of Hong Kong, Shatin, Hong Kong, China.
Chan
CM
Leung
PT
Chu
M