Study of microwave-induced phase switches from the finite voltage state in Bi2Sr2CaCu2Oy intrinsic Josephson junctions

Haruhisa Kitano, Ayami Yamaguchi, Yusaku Takahashi, Daiki Kakehi, Shinya Ayukawa

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

We study the microwave-induced phase switches from the finite voltage state for the underdamped intrinsic Josephson junctions (IJJs) made of Bi2Sr2CaCu2Oy (Bi2212). We observe the resonant double-peak structure in the switching current distribution at low temperatures. This feature is successfully explained by a quantum mechanical model where the strong microwave field effectively suppresses the potential barrier for the phase escape from a potential well and the macroscopic quantum tunneling (MQT) is resonantly enhanced. The detailed analyses considering the effects of multiple phase retrapping processes after the phase escape strongly suggest that the intense microwave field suppresses the energy-level spacing in the potential well, by effectively decreasing the fluctuation-free critical current and the Josephson plasma frequency. This effect also reduces the number of photons required for the multiphoton transition between the ground and the first excited states, making it possible to observe the energy level quantization in the MQT state. The temperature dependence of the resonance peak emerging in the switching rate clearly demonstrates that the quantized energy state can be survived up to ∼10 K, which is much higher than a crossover temperature predicted by the conventional Caldeira-Leggett theory.

Original languageEnglish
Article number012008
JournalJournal of Physics: Conference Series
Volume871
Issue number1
DOIs
Publication statusPublished - Jul 26 2017
Externally publishedYes

Fingerprint

Josephson junctions
switches
microwaves
escape
electric potential
energy levels
plasma frequencies
current distribution
emerging
critical current
crossovers
spacing
temperature dependence
photons
excitation
temperature
energy

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Study of microwave-induced phase switches from the finite voltage state in Bi2Sr2CaCu2Oy intrinsic Josephson junctions. / Kitano, Haruhisa; Yamaguchi, Ayami; Takahashi, Yusaku; Kakehi, Daiki; Ayukawa, Shinya.

In: Journal of Physics: Conference Series, Vol. 871, No. 1, 012008, 26.07.2017.

Research output: Contribution to journalArticle

Kitano, Haruhisa ; Yamaguchi, Ayami ; Takahashi, Yusaku ; Kakehi, Daiki ; Ayukawa, Shinya. / Study of microwave-induced phase switches from the finite voltage state in Bi2Sr2CaCu2Oy intrinsic Josephson junctions. In: Journal of Physics: Conference Series. 2017 ; Vol. 871, No. 1.
@article{62c477e2e6dc4d799f6c460e140f0b0f,
title = "Study of microwave-induced phase switches from the finite voltage state in Bi2Sr2CaCu2Oy intrinsic Josephson junctions",
abstract = "We study the microwave-induced phase switches from the finite voltage state for the underdamped intrinsic Josephson junctions (IJJs) made of Bi2Sr2CaCu2Oy (Bi2212). We observe the resonant double-peak structure in the switching current distribution at low temperatures. This feature is successfully explained by a quantum mechanical model where the strong microwave field effectively suppresses the potential barrier for the phase escape from a potential well and the macroscopic quantum tunneling (MQT) is resonantly enhanced. The detailed analyses considering the effects of multiple phase retrapping processes after the phase escape strongly suggest that the intense microwave field suppresses the energy-level spacing in the potential well, by effectively decreasing the fluctuation-free critical current and the Josephson plasma frequency. This effect also reduces the number of photons required for the multiphoton transition between the ground and the first excited states, making it possible to observe the energy level quantization in the MQT state. The temperature dependence of the resonance peak emerging in the switching rate clearly demonstrates that the quantized energy state can be survived up to ∼10 K, which is much higher than a crossover temperature predicted by the conventional Caldeira-Leggett theory.",
author = "Haruhisa Kitano and Ayami Yamaguchi and Yusaku Takahashi and Daiki Kakehi and Shinya Ayukawa",
year = "2017",
month = "7",
day = "26",
doi = "10.1088/1742-6596/871/1/012008",
language = "English",
volume = "871",
journal = "Journal of Physics: Conference Series",
issn = "1742-6588",
publisher = "IOP Publishing Ltd.",
number = "1",

}

TY - JOUR

T1 - Study of microwave-induced phase switches from the finite voltage state in Bi2Sr2CaCu2Oy intrinsic Josephson junctions

AU - Kitano, Haruhisa

AU - Yamaguchi, Ayami

AU - Takahashi, Yusaku

AU - Kakehi, Daiki

AU - Ayukawa, Shinya

PY - 2017/7/26

Y1 - 2017/7/26

N2 - We study the microwave-induced phase switches from the finite voltage state for the underdamped intrinsic Josephson junctions (IJJs) made of Bi2Sr2CaCu2Oy (Bi2212). We observe the resonant double-peak structure in the switching current distribution at low temperatures. This feature is successfully explained by a quantum mechanical model where the strong microwave field effectively suppresses the potential barrier for the phase escape from a potential well and the macroscopic quantum tunneling (MQT) is resonantly enhanced. The detailed analyses considering the effects of multiple phase retrapping processes after the phase escape strongly suggest that the intense microwave field suppresses the energy-level spacing in the potential well, by effectively decreasing the fluctuation-free critical current and the Josephson plasma frequency. This effect also reduces the number of photons required for the multiphoton transition between the ground and the first excited states, making it possible to observe the energy level quantization in the MQT state. The temperature dependence of the resonance peak emerging in the switching rate clearly demonstrates that the quantized energy state can be survived up to ∼10 K, which is much higher than a crossover temperature predicted by the conventional Caldeira-Leggett theory.

AB - We study the microwave-induced phase switches from the finite voltage state for the underdamped intrinsic Josephson junctions (IJJs) made of Bi2Sr2CaCu2Oy (Bi2212). We observe the resonant double-peak structure in the switching current distribution at low temperatures. This feature is successfully explained by a quantum mechanical model where the strong microwave field effectively suppresses the potential barrier for the phase escape from a potential well and the macroscopic quantum tunneling (MQT) is resonantly enhanced. The detailed analyses considering the effects of multiple phase retrapping processes after the phase escape strongly suggest that the intense microwave field suppresses the energy-level spacing in the potential well, by effectively decreasing the fluctuation-free critical current and the Josephson plasma frequency. This effect also reduces the number of photons required for the multiphoton transition between the ground and the first excited states, making it possible to observe the energy level quantization in the MQT state. The temperature dependence of the resonance peak emerging in the switching rate clearly demonstrates that the quantized energy state can be survived up to ∼10 K, which is much higher than a crossover temperature predicted by the conventional Caldeira-Leggett theory.

UR - http://www.scopus.com/inward/record.url?scp=85027978885&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85027978885&partnerID=8YFLogxK

U2 - 10.1088/1742-6596/871/1/012008

DO - 10.1088/1742-6596/871/1/012008

M3 - Article

AN - SCOPUS:85027978885

VL - 871

JO - Journal of Physics: Conference Series

JF - Journal of Physics: Conference Series

SN - 1742-6588

IS - 1

M1 - 012008

ER -