Haldane gap and fractional oscillations in gated Josephson arrays

被引：18

作者：

Altman, E ^{[1
]}

Auerbach, A

机构：

[1] Technion Israel Inst Technol, Dept Phys, IL-32000 Haifa, Israel

[2] Stanford Univ, Dept Phys, Stanford, CA 94305 USA

来源：

PHYSICAL REVIEW LETTERS | 1998年 / 81卷 / 20期

关键词：

D O I：

10.1103/PhysRevLett.81.4484

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

An analogy between the twisted quantum xxz model and a gated Josephson junction array is used to predict sharp structure in the critical currents versus gate voltage, and fractional ac Josephson frequencies. We prove selection rules for level crossings which imply fractional periodicities of ground states with varying Aharonov-Bohm flux. Extrapolated numerical diagonalization on ladders indicates a Haldane gap at moderate easy-plane anisotropy, with vanishing superfluid stiffness. Physical parameters for experimental realization of these novel effects are proposed. [S0031-9007(98)07646-7].

引用

页码：4484 / 4487

页数：4

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