Gate-Tunable Dissipation and "Superconductor-Insulator" Transition in Carbon Nanotube Josephson Junctions

被引:19
作者
Liu, Gang [1 ]
Zhang, Yong [1 ]
Lau, Chun Ning [1 ]
机构
[1] Univ Calif Riverside, Dept Phys & Astron, Riverside, CA 92521 USA
基金
美国国家科学基金会;
关键词
PHASE; INTERFERENCE; ARRAY;
D O I
10.1103/PhysRevLett.102.016803
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Dissipation is ubiquitous in quantum systems, and its interplay with fluctuations is critical to maintaining quantum coherence. We experimentally investigate the dissipation dynamics in single-walled carbon nanotubes coupled to superconductors. The voltage-current characteristics display gate-tunable hysteresis, with sizes that perfectly correlate with the normal state resistance R-N, indicating the junction undergoes a periodic modulation between the underdamped and overdamped regimes. Surprisingly, when a device's Fermi level is tuned through a local conductance minimum, we observe a gate-controlled transition from superconductinglike to insulatinglike states, with a "critical" R-N value similar to 8-20 k Omega.
引用
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页数:4
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