scholarly journals Effect of zero-energy bound states on macroscopic quantum tunneling in high-Tcsuperconductor junctions

2005 ◽  
Vol 72 (5) ◽  
Author(s):  
Shiro Kawabata ◽  
Satoshi Kashiwaya ◽  
Yasuhiro Asano ◽  
Yukio Tanaka
Keyword(s):  
Quantum Tunneling ◽  
Bound States ◽  
Zero Energy ◽  
Macroscopic Quantum ◽  
Energy Bound ◽  
Macroscopic Quantum Tunneling

Reentrance of Macroscopic Quantum Tunneling in Cuprate Superconductors

2010 ◽  
Vol 75 ◽  
pp. 155-160
Author(s):  
Jens Michelsen ◽  
Vitaly S. Shumeiko
Keyword(s):  
Quantum Tunneling ◽  
Bound States ◽  
Thermal Activation ◽  
Cuprate Superconductors ◽  
Crossover Temperature ◽  
Macroscopic Quantum ◽  
Current State ◽  
Energy Bound ◽  
Macroscopic Quantum Tunneling ◽  
Gap States

We present a theoretical analysis of the transition from thermal activation (TA) regime to the macroscopic quantum tunneling (MQT) regime of the decay from a metastable persistent current state in grain boundary junctions of cuprate superconductors. This transition is conventionally characterized by a single crossover temperature determined by the potential profile and dissipative mechanisms. It is shown that due to the existence of low energy bound states (mid-gap states) for various relative orientations of the crystal axes, there exists a window of parameters where one finds, with lowering temperature, an inverse crossover from MQT to TA, followed by a subsequent reentrance of MQT. It is shown that these predictions are in reasonable agreement with recent experiments.

Macroscopic quantum tunneling of charge density waves

1999 ◽  
Vol 09 (PR10) ◽  
pp. Pr10-161-Pr10-163
Author(s):  
H. Matsukawa ◽  
H. Miyake ◽  
M. Yumoto ◽  
H. Fukuyama
Keyword(s):  
Charge Density ◽  
Quantum Tunneling ◽  
Charge Density Waves ◽  
Density Waves ◽  
Macroscopic Quantum ◽  
Macroscopic Quantum Tunneling

Theory of macroscopic quantum tunneling in Nb/Au/YBCO Josephson junctions

2007 ◽  
Vol 463-465 ◽  
pp. 80-83 ◽  
Author(s):  
S. Kawabata ◽  
A.A. Golubov ◽  
Ariando ◽  
C.J.M. Verwijs ◽  
H. Hilgenkamp
Keyword(s):  
Quantum Tunneling ◽  
Josephson Junctions ◽  
Macroscopic Quantum ◽  
Macroscopic Quantum Tunneling

scholarly journals Spectral singularities and zero energy bound states

2011 ◽  
Vol 63 (3) ◽  
pp. 369-373 ◽  
Author(s):  
W. D. Heiss ◽  
R. G. Nazmitdinov
Keyword(s):  
Bound States ◽  
Zero Energy ◽  
Spectral Singularities ◽  
Energy Bound
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