TY - JOUR
T1 - Vortices and Quantum Tunneling in Current-Biased 0-π-0 Josephson Junctions of d-Wave Superconductors
AU - Kato, Takeo
AU - Imada, Masatoshi
PY - 1997/5
Y1 - 1997/5
N2 - We study a current-biased 0-π-0 Josephson junction made by high-Tc superconductors, theoretically. When a length of the π junction is large enough, this junction contains a vortex-antivortex pair of both ends of the π junction. Magnetic flux carried by the vortices is calculated using the sine-Gordon equation. The result shows that the magnetic flux of the vortices is suppresed to zero as the distance between the vortices is reduced. By applying an external current, the orientation of the vortices is reversed, and a voltage pulse is generated. The current needed for this transition and generated pulse energy are calculated. Macroscopic quantum tunneling (MQT) in this transition is also studied. The tunneling rate has been evaluated by an effective Hamiltonian with one degree of freedom.
AB - We study a current-biased 0-π-0 Josephson junction made by high-Tc superconductors, theoretically. When a length of the π junction is large enough, this junction contains a vortex-antivortex pair of both ends of the π junction. Magnetic flux carried by the vortices is calculated using the sine-Gordon equation. The result shows that the magnetic flux of the vortices is suppresed to zero as the distance between the vortices is reduced. By applying an external current, the orientation of the vortices is reversed, and a voltage pulse is generated. The current needed for this transition and generated pulse energy are calculated. Macroscopic quantum tunneling (MQT) in this transition is also studied. The tunneling rate has been evaluated by an effective Hamiltonian with one degree of freedom.
KW - Half vortex
KW - High-T superconductor
KW - Macroscopic quantum tunneling
KW - Sine-Gordon equation
KW - π junction
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U2 - 10.1143/JPSJ.66.1445
DO - 10.1143/JPSJ.66.1445
M3 - Article
AN - SCOPUS:0031526675
SN - 0031-9015
VL - 66
SP - 1445
EP - 1449
JO - journal of the physical society of japan
JF - journal of the physical society of japan
IS - 5
ER -