arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0907.2046cond-mat.quant-gas
收藏

相互作用玻色子系统的自洽单带近似

Self-consistent Single-band Approximation for Interacting Boson Systems

Biao Wu, Junren Shi

摘要:

传统上,相互作用多体系统的单带近似是用预先确定的单粒子Wannier函数来完成的,忽略了Wannier函数对相互作用的依赖性。我们表明,单带近似必须做自洽适当考虑的相互作用对Wannier函数。这种自洽的单带近似导致了Wannier函数的非线性方程,该方程可以重新转换为Bloch函数的非线性方程组。这些方程被简化为两种特殊情况,超流政权和深的莫特绝缘体政权。一个简单的双阱势的例子被用来说明我们的结果。

英文摘要:

Traditionally, the single-band approximation for interacting many-body systems is done with pre-determined single-particle Wannier functions, ignoring the dependence of the Wannier function on interaction. We show that the single-band approximation has to be done self-consistently to properly account the interaction effect on the Wannier functions. This self-consistent single-band approximation leads to a nonlinear equation for Wannier functions, which can be recast into a set of nonlinear equations for Bloch functions. These equations are simplified for two special cases, the superfluid regime and deep in the Mott insulator regime. A simple example with double-well potential is used to illustrate our results.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑