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arXiv 0810.2604cond-mat.supr-concond-mat.str-el
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二维格点玻色子的涡旋量子动力学

Vortex quantum dynamics of two dimensional lattice bosons

Netanel H. Lindner, Assa Auerbach, Daniel P. Arovas

摘要:

在二维中,涡旋晶格可以通过量子涨落熔化成非超流的量子涡旋液体(QVL)。为了确定熔化条件,我们计算裸涡跳跃率的精确对角化的正方形团簇附近的半填充。将我们的有效哈密顿量映射到物理评论Lett中模拟的玻色子Coloumb液体。73,826(1994)中,我们预期QVL高于每个晶格位置0.0065个涡旋的熔化密度。我们还使用绝热曲率计算霍尔电导率。作为玻色子填充的函数,它在半填充处反转符号,并伴随着消失的温度标度。在半填充时,由于局域非对易SU(2)对称性,每个涡旋携带自旋半量子数(“v-自旋”)。这些结果对冷原子、约瑟夫森结阵列和铜氧化物超导体都有重要意义。

英文摘要:

In two dimensions a vortex lattice can melt by quantum fluctuations into a non-superfluid Quantum Vortex Liquid (QVL). To determine the melting conditions, we compute the bare vortex hopping rate by exact diagonalization of square clusters near half filling. Mapping our effective Hamiltonian to the Boson Coloumb Liquid simulated in Phys. Rev. Lett. 73, 826 (1994), we expect a QVL above a melting density of 0.0065 vortices per lattice site. We also compute the Hall conductivity using adiabatic curvatures. As a function of boson filling it reverses sign at half filling in a sharp transition accompanied by a vanishing temperature scale. At half filling, each vortex carries a spin half quantum number (`v-spin'), as a consequence of local non commuting SU(2) symmetries. Implications of these results could be realized in cold atoms, Josephson junction arrays and cuprate superconductors.

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