Local versus global equilibration near the bosonic Mott-insulator-superfluid transition.
Local versus global equilibration near the bosonic Mott-insulator-superfluid transition.
复制标题
玻色莫特-绝缘体-超流体转变附近的局部与全局平衡。
DOI:
10.1103/physrevlett.106.125301
复制
发表时间:
2010
影响因子:
8.6
通讯作者:
E. Mueller
中科院分区:
文献类型:
--
作者:
Stefan S. Natu;K. Hazzard;E. Mueller
We study the time scales for adiabaticity of trapped cold bosons subject to a time-varying lattice potential using a dynamic Gutzwiller mean-field theory. We explain apparently contradictory experimental observations by demonstrating a clear separation of time scales for local dynamics (~ ms) and global mass redistribution (~1 s). We provide a simple explanation for the short and fast time scales, finding that while density or energy transport is dominated by low energy phonons, particle-hole excitations set the adiabaticity time for fast ramps. We show how mass transport shuts off within Mott-insulator domains, leading to a chemical potential gradient that fails to equilibrate on experimental time scales.