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arXiv 0910.1114cond-mat.quant-gascond-mat.stat-mech
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光晶格中自旋1玻色子的等熵性

Isentropes of spin-1 bosons in an optical lattice

K. W. Mahmud, G. G. Batrouni, R. T. Scalettar

摘要:

我们分析了光晶格绝热斜坡效应对均匀晶格中自旋1玻色子温度的影响。利用平均场论,我们给出了温度-相互作用强度($T,U_0$)平面内铁磁、反铁磁和零自旋耦合的等熵线。沿着等熵线,可以确定当前实验的绝热加载期间的温度变化。结果表明,加热-冷却分界线位于超流-Mott相边界上,冷却发生在超流内部,加热发生在莫特绝缘体内部,并定量分析了自旋耦合对加热速率的影响.我们发现,低初始熵的平均场等熵线终止于超流-莫特绝缘体相边界。

英文摘要:

We analyze the effects of adiabatic ramping of optical lattices on the temperature of spin-1 bosons in a homogeneous lattice. Using mean-field theory, we present the isentropes in the temperature-interaction strength ($T,U_0$) plane for ferromagnetic, antiferromagnetic, and zero spin couplings. Following the isentropic lines, temperature changes can be determined during adiabatic loading of current experiments. We show that the heating-cooling separatrix lies on the superfluid-Mott phase boundary with cooling occuring within the superfluid and heating in the Mott insulator, and quantify the effects of spin coupling on the heating rate. We find that the mean-field isentropes for low initial entropy terminate at the superfluid-Mott insulator phase boundary.

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