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arXiv 1008.4752cond-mat.quant-gas
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二分光学正方晶格$F$带中的非常规超流序

Unconventional superfluid order in the $F$-band of a bipartite optical square lattice

Matthias Ölschläger, Georg Wirth, Andreas Hemmerich

摘要:

我们报告的第一个观察到的玻色子凝聚到一个$F$ -带的能量极小的二分正方形光晶格。动量谱表明,建立了一个真正的复值交错角动量超流序。相应的波函数是由交替的局部$F_{2x^3-3x} + i F_{2y^3-3y}$ -轨道和局部$S$ -轨道组成的,它们位于晶格的深阱和浅阱中,排列成棋盘的黑白区域。出现交错的涡旋电流的图案,这打破了时间反演对称性和晶格势的平移对称性。我们已经测量了不同相对深度的浅和深晶格阱的动量谱中的高阶布拉格峰的布居数,并发现与能带计算的显着一致。

英文摘要:

We report on the first observation of bosons condensed into the energy minima of an $F$-band of a bipartite square optical lattice. Momentum spectra indicate that a truly complex-valued staggered angular momentum superfluid order is established. The corresponding wave function is composed of alternating local $F_{2x^3-3x} + i F_{2y^3-3y}$-orbits and local $S$-orbits residing in the deep and shallow wells of the lattice, which are arranged as the black and white areas of a checkerboard. A pattern of staggered vortical currents arises, which breaks time reversal symmetry and the translational symmetry of the lattice potential. We have measured the populations of higher order Bragg peaks in the momentum spectra for varying relative depths of the shallow and deep lattice wells and find remarkable agreement with band calculations.

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。

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