Macroscopic quantum tunneling in a stack of capacitively-coupled intrinsic Josephson junctions

Tomio Koyama; Masahiko Machida

doi:10.1016/j.physc.2007.11.033

Macroscopic quantum tunneling in a stack of capacitively-coupled intrinsic Josephson junctions

Tomio Koyama, Masahiko Machida

Institute for Materials Research (IMR)

Research output: Contribution to journal › Article › peer-review

10 Citations (Scopus)

Abstract

A macroscopic quantum theory for the phase dynamics in capacitively-coupled intrinsic Josephson junctions (IJJ's) is constructed. We quantize the capacitively-coupled IJJ model in terms of the canonical quantization method. The multi-junction effect for the macroscopic quantum tunneling (MQT) to the first resistive branch is clarified. It is shown that the escape rate is greatly enhanced by the capacitive coupling between junctions. We also discuss the origin of the N²-enhancement in the escape rate observed in the uniformly switching in Bi-2212 IJJ's.

Original language	English
Pages (from-to)	695-700
Number of pages	6
Journal	Physica C: Superconductivity and its applications
Volume	468
Issue number	7-10
DOIs	https://doi.org/10.1016/j.physc.2007.11.033
Publication status	Published - 2008 Apr 1

Keywords

Capacitively-coupled intrinsic Josephson junction model
Intrinsic Josephson junctions
Macroscopic quantum tunneling

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

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10.1016/j.physc.2007.11.033

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T1 - Macroscopic quantum tunneling in a stack of capacitively-coupled intrinsic Josephson junctions

AU - Koyama, Tomio

AU - Machida, Masahiko

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N2 - A macroscopic quantum theory for the phase dynamics in capacitively-coupled intrinsic Josephson junctions (IJJ's) is constructed. We quantize the capacitively-coupled IJJ model in terms of the canonical quantization method. The multi-junction effect for the macroscopic quantum tunneling (MQT) to the first resistive branch is clarified. It is shown that the escape rate is greatly enhanced by the capacitive coupling between junctions. We also discuss the origin of the N2-enhancement in the escape rate observed in the uniformly switching in Bi-2212 IJJ's.

AB - A macroscopic quantum theory for the phase dynamics in capacitively-coupled intrinsic Josephson junctions (IJJ's) is constructed. We quantize the capacitively-coupled IJJ model in terms of the canonical quantization method. The multi-junction effect for the macroscopic quantum tunneling (MQT) to the first resistive branch is clarified. It is shown that the escape rate is greatly enhanced by the capacitive coupling between junctions. We also discuss the origin of the N2-enhancement in the escape rate observed in the uniformly switching in Bi-2212 IJJ's.

KW - Capacitively-coupled intrinsic Josephson junction model

KW - Intrinsic Josephson junctions

KW - Macroscopic quantum tunneling

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