Two-dimensional Bose liquid with strong gauge-field interaction.
Two-dimensional Bose liquid with strong gauge-field interaction.
复制标题
具有强规范场相互作用的二维玻色液体。
DOI：
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发表时间：
1993
期刊：
影响因子：
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通讯作者：
Larkin
中科院分区：
文献类型：
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作者：
Feigelman;Geshkenbein;Ioffe;Larkin
两个不相关的问题可归结为玻色气体与规范场相互作用的模型：（i）在磁场\[H_{c1}\ll H\ll H_{c2}\]中，体超导体中涡旋系统的热涨落效应；（ii）二维（2D）强关联电子系统中带电、无自旋的激发。这两个问题对于高温超导体理论都很重要。我们在三种情况下研究该模型：在有限温度下，假设规范场是纯横向的；在\[T = 0\]时，对于纯静态（2D库仑）相互作用；以及在\[T = 0\]时，对于弱库仑相互作用和强横向相互作用。横向相互作用显著抑制超流转变温度。当温度降低时（在没有库仑排斥的情况下），足够强的横向相互作用会产生相分离。如果存在库仑排斥，基态没有非对角长程序，但超流密度不为零，除非库仑常数超过临界值。与横向场足够强的耦合也会破坏超流性。在大耦合形成的正常态下，平移不变性保持不变。我们提出一种在\[T = 0\]时不是超流的玻色子基态。我们讨论了这些结果对涡旋液体和强关联电子系统的影响。
Two unrelated problems can be reduced to a model of a Bose gas interacting with a gauge field: (i) the effect of thermal fluctuations on a system of vortices in bulk superconductors in fields [ital H][sub [ital c]1][much lt][ital H][much lt][ital H][sub [ital c]2], and (ii) charged, spinless excitations in two-dimensional (2D) strongly correlated electron systems. Both problems are important for the theory of high-temperature superconductors. We study this model in three regimes: at finite temperatures, assuming that the gauge field is purely transverse; at [ital T]=0, for the purely static (2D Coulomb) interaction; and at [ital T]=0, for a weak Coulomb interaction and a strong transverse one. Transverse interactions suppress the temperature of the superfluid transition significantly. A sufficiently strong transvese interaction is shown to produce a phase separation as the temperature decreases (in the absence of Coulomb repulsion). If there is Coulomb repulsion, the ground state does not have off-diagonal long-range order but the superfluid density is not zero unless the Coulomb constant exceeds a critical value. Sufficiently strong coupling to the transverse field destroys superfluidity as well. In the normal state formed at large couplings, the translational invariance is intact. We propose a bosonic ground state thatmore » is not superfluid at [ital T]=0. We discuss the implications of these results both for vortex liquids and strongly correlated electron systems.« less