Mesoscopic superconductivity above 10 K in silicon point contacts

2018 ◽  
Vol 113 (24) ◽  
pp. 242601 ◽  
Author(s):  
Anshu Sirohi ◽  
Sirshendu Gayen ◽  
Mohammad Aslam ◽  
Goutam Sheet
Keyword(s):  
Point Contacts ◽  
Mesoscopic Superconductivity

scholarly journals Mesoscopic superconductivity and high spin polarization coexisting at metallic point contacts on Weyl semimetal TaAs

2017 ◽  
Vol 8 (1) ◽  
Author(s):  
Leena Aggarwal ◽  
Sirshendu Gayen ◽  
Shekhar Das ◽  
Ritesh Kumar ◽  
Vicky Süß ◽  
...  
Keyword(s):  
Spin Polarization ◽  
High Spin ◽  
Point Contacts ◽  
Weyl Semimetal ◽  
Mesoscopic Superconductivity ◽  
High Spin Polarization

Different Transmission Regimes of Two Quantum Point Contacts in a Magnetic Field

1995 ◽  
Vol 5 (9) ◽  
pp. 1257-1262
Author(s):  
V. Marigliano Ramaglia ◽  
F. Ventriglia ◽  
G. P. Zucchelli
Keyword(s):  
Magnetic Field ◽  
Quantum Point Contacts ◽  
Point Contacts ◽  
Quantum Point

Double-Channel Electron Transport in Suspended Quantum Point Contacts with in-Plane Side Gates

2020 ◽  
Vol 54 (12) ◽  
pp. 1605-1610
Author(s):  
D. A. Pokhabov ◽  
A. G. Pogosov ◽  
E. Yu. Zhdanov ◽  
A. K. Bakarov ◽  
A. A. Shklyaev
Keyword(s):  
Electron Transport ◽  
Quantum Point Contacts ◽  
Point Contacts ◽  
Quantum Point ◽  
Double Channel

Resonant detection of microwave radiation in a circular two-dimensional electron system with quantum point contacts

2005 ◽  
Vol 87 (9) ◽  
pp. 092107 ◽  
Author(s):  
P. S. Dorozhkin ◽  
S. V. Tovstonog ◽  
S. A. Mikhailov ◽  
I. V. Kukushkin ◽  
J. H. Smet ◽  
...  
Keyword(s):  
Microwave Radiation ◽  
Electron System ◽  
Quantum Point Contacts ◽  
Two Dimensional ◽  
Point Contacts ◽  
Dimensional Electron ◽  
Dimensional Electron System ◽  
Quantum Point

Quantum interference in two independently tunable parallel point contacts

1991 ◽  
Vol 44 (24) ◽  
pp. 13497-13503 ◽  
Author(s):  
S. W. Hwang ◽  
J. A. Simmons ◽  
D. C. Tsui ◽  
M. Shayegan
Keyword(s):  
Quantum Interference ◽  
Point Contacts

scholarly journals Electromigration-induced directional steps towards the formation of single atomic Ag contacts

2020 ◽  
Vol 11 ◽  
pp. 680-687
Author(s):  
Atasi Chatterjee ◽  
Christoph Tegenkamp ◽  
Herbert Pfnür
Keyword(s):  
Fourier Transforms ◽  
Single Point ◽  
Point Contact ◽  
Single Atom ◽  
Point Contacts ◽  
Cross Sectional ◽  
Shell Effects ◽  
Theoretical Approaches ◽  
Average Grain Size ◽  
Thinning Process

Even though there have been many experimental attempts and theoretical approaches to understand the process of electromigration (EM), it has not been quantitatively understood for ultrathin structures and at grain boundaries. Nevertheless, we showed recently that it can be used reliably for the formation of single atomic point contacts after careful pre-structuring of the initial Ag nanostructures. The process of formation of nanocontacts by EM down to a single-atom point contact was investigated for ultrathin (5 nm) Ag structures at 100 K by measuring the conductance as a function of the time during EM. In this paper, we compare the process of thinning by EM of structures with constrictions below the average grain size of Ag layers (15 nm) with that of structures with much larger initial constrictions of around 150 nm having multiple grains at the centre constriction prior to the formation of a point contact. Even though clear morphological differences exist between both types of structures, quantized conductance plateaus showing the formation of single point contacts have been observed for both. Here we put emphasis on the thinning process by EM, just before a point contact is formed. To understand this thinning process, the semi-classical regime before the contact reaches the quantum regime was analyzed in detail. For this purpose, we used experimental conductance histograms in the range between 2G 0 and 15G 0 and their corresponding Fourier transforms (FTs). The FT analysis of the conductance histograms exhibits a clear preference for thinning along the [100] direction. Using well-established models, both atom-by-atom steps and ranges of stability, presumably caused by electronic shell effects, can be discriminated. Although the directional motion of atoms during EM leads to specific properties such as the instabilities mentioned, similarities to mechanically opened contacts with respect to cross-sectional stability were found.

Tunneling characteristics of point contacts with high-T c material

1989 ◽  
Vol 162-164 ◽  
pp. 1055-1056
Author(s):  
H.J. Van Schevicoven ◽  
A.Th.A.M. de Waele
Keyword(s):  
Point Contacts
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