Motional dressed states in a Bose-Einstein condensate: Superfluidity at supersonic speed

Authors
Law, CK Chan, CM Leung, PT Chu, MC
Citation
Ck. Law et al., Motional dressed states in a Bose-Einstein condensate: Superfluidity at supersonic speed, PHYS REV L, 85(8), 2000, pp. 1598-1601
Citations number
17
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
00319007 → ACNP
Volume
85
Issue
8
Year of publication
2000
Pages
1598 - 1601
Database
ISI
SICI code
0031-9007(20000821)85:8<1598:MDSIAB>2.0.ZU;2-M
Abstract
We present an exact analytic solution of a nonlinear Schrodinger field inte racting with a moving potential (obstacle) at supersonic speed. We discover conditions under which the field can form a stable shape-invariant structu re localized around the obstacle-a dressing effect that protects the field against excitations by the obstacle. Such an effect demonstrates the existe nce of frictionless motion beyond the conventionally defined critical veloc ity.