Zero-Bias-Conductance-Peak Anomaly of Ta-I-Al Tunnel Junctions at 0.3 K and 90 kG

1972 ◽  
Vol 5 (2) ◽  
pp. 544-553 ◽  
Author(s):  
Joel A. Appelbaum ◽  
L. Y. L. Shen
Keyword(s):  
Tunnel Junctions ◽  
Zero Bias ◽  
Conductance Peak ◽  
Zero Bias Conductance

Zero Bias Conductance Peak Enhancement in Bi 2Sr 2CaCu 2O 8+δ-SiO-Ag Planar Tunnel Junctions

2000 ◽  
Vol 69 (9) ◽  
pp. 2743-2746 ◽  
Author(s):  
Iduru Shigeta ◽  
Toll Uchida ◽  
Yukihiro Tominari ◽  
Takeshi Arai ◽  
Fusao Ichikawa ◽  
...  
Keyword(s):  
Tunnel Junctions ◽  
Zero Bias ◽  
Conductance Peak ◽  
Peak Enhancement ◽  
Zero Bias Conductance

scholarly journals Quantum tunneling theory of Cooper pairs as bosonic particles

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Edgar J. Patiño ◽  
Daniel Lozano-Gómez
Keyword(s):  
Quantum Tunneling ◽  
Alternative Explanation ◽  
Tunnel Junctions ◽  
Tunneling Current ◽  
Phenomenological Theory ◽  
Low Energy ◽  
Cooper Pairs ◽  
Zero Bias ◽  
Conductance Peak ◽  
Zero Bias Conductance

AbstractWe propose a simple phenomenological theory for quantum tunneling of Cooper pairs, in superconductor/insulator/superconductor tunnel junctions, for a regime where the system can be modeled as bosonic particles. Indeed, provided there is an absence of quasiparticle excitations (fermions), our model reveals a rapid increase in tunneling current, around zero bias voltage, which rapidly saturates. This manifests as a zero bias conductance peak that strongly depends on the superconductors temperature in a non-monotonic way. This low energy tunneling of Cooper pairs could serve as an alternative explanation for a number of tunneling experiments where zero bias conductance peak has been observed.

Zero-bias conductance peak reduction by diffusive normal metal in high-Tc superconductor tunnel junctions

2005 ◽  
Vol 66 (8-9) ◽  
pp. 1401-1404
Author(s):  
Iduru Shigeta ◽  
Yukio Tanaka ◽  
Fusao Ichikawa ◽  
Yasuhiro Asano ◽  
Satoshi Kashiwaya
Keyword(s):  
Tunnel Junctions ◽  
Normal Metal ◽  
Peak Reduction ◽  
Zero Bias ◽  
High Tc ◽  
High Tc Superconductor ◽  
Conductance Peak ◽  
Zero Bias Conductance

scholarly journals Anomalous Zero-Bias Conductance Peak in a Nb–InSb Nanowire–Nb Hybrid Device

Nano Letters ◽  
2012 ◽  
Vol 12 (12) ◽  
pp. 6414-6419 ◽  
Author(s):  
M. T. Deng ◽  
C. L. Yu ◽  
G. Y. Huang ◽  
M. Larsson ◽  
P. Caroff ◽  
...  
Keyword(s):  
Zero Bias ◽  
Hybrid Device ◽  
Conductance Peak ◽  
Zero Bias Conductance

scholarly journals Theory of point contact spectroscopy in correlated materials

2015 ◽  
Vol 112 (3) ◽  
pp. 651-656 ◽  
Author(s):  
Wei-Cheng Lee ◽  
Wan Kyu Park ◽  
Hamood Z. Arham ◽  
Laura H. Greene ◽  
Philip Phillips
Keyword(s):  
Scattering Length ◽  
Point Contact ◽  
Microscopic Theory ◽  
Effective Density ◽  
Strongly Correlated ◽  
Metallic Electrode ◽  
Zero Bias ◽  
Point Contact Spectroscopy ◽  
Conductance Peak ◽  
Zero Bias Conductance

We developed a microscopic theory for the point-contact conductance between a metallic electrode and a strongly correlated material using the nonequilibrium Schwinger-Kadanoff-Baym-Keldysh formalism. We explicitly show that, in the classical limit, contact size shorter than the scattering length of the system, the microscopic model can be reduced to an effective model with transfer matrix elements that conserve in-plane momentum. We found that the conductance dI/dV is proportional to the effective density of states, that is, the integrated single-particle spectral function A(ω = eV) over the whole Brillouin zone. From this conclusion, we are able to establish the conditions under which a non-Fermi liquid metal exhibits a zero-bias peak in the conductance. This finding is discussed in the context of recent point-contact spectroscopy on the iron pnictides and chalcogenides, which has exhibited a zero-bias conductance peak.

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