TY - JOUR

T1 - Quantum dynamics of instability-induced pulsations of a Bose-Einstein condensate in an optical lattice

AU - Shrestha, Uttam

AU - Javanainen, Juha

AU - Ruostekoski, Janne

PY - 2009/4/16

Y1 - 2009/4/16

N2 - We study quantum dynamics of a Bose-Einstein condensate in a one-dimensional optical lattice in the limit of weak atom-atom interactions within the truncated Wigner approximation for a system with one dynamicallyunstable mode. This extends previous classical studies of a pulsating dynamical instability in which atomsperiodically collect together and subsequently disperse back into the initial homogeneous state. We observethat the quasiperiodic behavior still persists in the presence of quantum fluctuations for a single realization that represents a typical experimental outcome, but ensemble averages show various manifestations of quantum statistics. Quantum effects become more prominent when the effective interaction strength is increased.

AB - We study quantum dynamics of a Bose-Einstein condensate in a one-dimensional optical lattice in the limit of weak atom-atom interactions within the truncated Wigner approximation for a system with one dynamicallyunstable mode. This extends previous classical studies of a pulsating dynamical instability in which atomsperiodically collect together and subsequently disperse back into the initial homogeneous state. We observethat the quasiperiodic behavior still persists in the presence of quantum fluctuations for a single realization that represents a typical experimental outcome, but ensemble averages show various manifestations of quantum statistics. Quantum effects become more prominent when the effective interaction strength is increased.

U2 - 10.1103/PhysRevA.79.043617

DO - 10.1103/PhysRevA.79.043617

M3 - Journal article

VL - 79

JO - Physical review a

JF - Physical review a

SN - 1050-2947

IS - 4

M1 - 043617

ER -