scholarly journals Quantum shell effects in compressed mesoscopic system

2019 ◽  
Vol 26 (2) ◽  
pp. 022709 ◽  
Author(s):  
S. E. Kuratov ◽  
D. S. Shidlovski ◽  
S. I. Blinnikov
Keyword(s):  
Mesoscopic System ◽  
Shell Effects

Two scales of quantum effects in a mesoscopic system of degenerate electrons

2020 ◽  
Author(s):  
Sergei E. Kuratov ◽  
Dmitry S. Shidlovski ◽  
Sergei I. Blinnikov ◽  
Sergey Yu. Igashov
Keyword(s):  
Quantum Effects ◽  
Mesoscopic System

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.

QCD as a Mesoscopic System

2005 ◽  
Author(s):  
Jacobus Verbaarschot
Keyword(s):  
Mesoscopic System

FISSION TIME OF α-INDUCED REACTIONS MEASURED BY THE CRYSTAL BLOCKING TECHNIQUE

2010 ◽  
Vol 19 (05n06) ◽  
pp. 1227-1235 ◽  
Author(s):  
V. A. DROZDOV ◽  
D. O. EREMENKO ◽  
O. V. FOTINA ◽  
S. Yu. PLATONOV ◽  
O. A. YUMINOV ◽  
...  
Keyword(s):  
Fission Fragment ◽  
Statistical Approach ◽  
Reliable Information ◽  
Fission Barrier ◽  
Large Set ◽  
Angular Anisotropy ◽  
Excitation Energies ◽  
Shell Effects ◽  
Pu Isotopes ◽  
Nuclear Dissipation

A large set of experimental observables for the 232 Th , 235 U (α, xnf ) reactions has been analyzed within the dynamic-statistical approach with allowance for the nuclear dissipation phenomenon, the double humped structure of fission barrier, and also the temperature damping of shell effects. The energy dependences of the lifetime effect (experimentally measured by the crystal blocking technique) along the corresponding data on the fission fragment angular anisotropy and also fission probabilities of U and Pu isotopes produced in the reactions were chosen for the analysis. Reliable information on the nuclear viscosity at the low excitation energies (< 30 MeV) was obtained.

scholarly journals Nuclear masses, deformations and shell effects

2011 ◽  
Vol 322 ◽  
pp. 012017 ◽  
Author(s):  
Jorge G Hirsch ◽  
César A Barbero ◽  
Alejandro E Mariano
Keyword(s):  
Shell Effects ◽  
Nuclear Masses

Off-shell effects in elastic pion-nucleus scattering

1974 ◽  
Vol 9 (4) ◽  
pp. 1370-1373 ◽  
Author(s):  
D. J. Ernst ◽  
C. M. Shakin ◽  
R. M. Thaler
Keyword(s):  
Shell Effects ◽  
Nucleus Scattering
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