Electrically Tunable Macroscopic Quantum Tunneling in a Graphene-Based Josephson Junction
Gil-Ho Lee, Dongchan Jeong, Jae-Hyun Choi, Yong-Joo Doh, Hu-Jong Lee
DOI 10.1103/PhysRevLett.107.146605 · Physical Review Letters
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Abstract
Stochastic switching-current distribution in a graphene-based Josephson junction exhibits a crossover from the classical to quantum regime, revealing the macroscopic quantum tunneling of a Josephson phase particle at low temperatures. Microwave spectroscopy measurements indicate a multiphoton absorption process occurring via discrete energy levels in washboard potential well. The crossover temperature for macroscopic quantum tunneling and the quantized level spacing are controlled with the gate voltage, implying its potential application to gate-tunable superconducting quantum bits.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Pb0.93In0.07 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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