scholarly journals Bound state with negative binding energy induced by coherent transport in a two-dimensional quantum wire

2005 ◽  
Vol 72 (15) ◽  
Author(s):  
Vidar Gudmundsson ◽  
Chi-Shung Tang ◽  
Andrei Manolescu
Keyword(s):  
Binding Energy ◽  
Quantum Wire ◽  
Bound State ◽  
Two Dimensional ◽  
Coherent Transport ◽  
Negative Binding Energy

scholarly journals An event excess observed in the deeply bound region of the 12C (K−, p) missing-mass spectrum

2020 ◽  
Vol 2020 (12) ◽  
Author(s):  
Yudai Ichikawa ◽  
Junko Yamagata-Sekihara ◽  
Jung Keun Ahn ◽  
Yuya Akazawa ◽  
Kanae Aoki ◽  
...  
Keyword(s):  
Mass Spectrum ◽  
Binding Energy ◽  
Decay Channel ◽  
Peak Shift ◽  
Bound State ◽  
Elastic Peak ◽  
Missing Mass ◽  
Decay Modes ◽  
Kaon Momentum ◽  
First Time

Abstract We have measured, for the first time, the inclusive missing-mass spectrum of the $^{12}$C$(K^-, p)$ reaction at an incident kaon momentum of 1.8 GeV/$c$ at the J-PARC K1.8 beamline. We observed a prominent quasi-elastic peak ($K^-p \rightarrow K^-p$) in this spectrum. In the quasi-elastic peak region, the effect of secondary interaction is apparently observed as a peak shift, and the peak exhibits a tail in the bound region. We compared the spectrum with a theoretical calculation based on the Green’s function method by assuming different values of the parameters for the $\bar{K}$–nucleus optical potential. We found that the spectrum shape in the binding-energy region $-300 \, \text{MeV} < B_{K} < 40$ MeV is best reproduced with the potential depths $V_0 = -80$ MeV (real part) and $W_0 = -40$ MeV (imaginary part). On the other hand, we observed a significant event excess in the deeply bound region around $B_{K} \sim 100$ MeV, where the major decay channel of $K^- NN \to \pi\Sigma N$ is energetically closed, and the non-mesonic decay modes ($K^- NN \to \Lambda N$ and $\Sigma N$) should mainly contribute. The enhancement is fitted well by a Breit–Wigner function with a kaon-binding energy of 90 MeV and width 100 MeV. A possible interpretation is a deeply bound state of a $Y^{*}$-nucleus system.

scholarly journals The influence of Coulomb interaction screening on the excitons in disordered two-dimensional insulators

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
E. V. Kirichenko ◽  
V. A. Stephanovich
Keyword(s):  
Coulomb Interaction ◽  
Energy Levels ◽  
Transition Metal Dichalcogenides ◽  
Extreme Case ◽  
Bound State ◽  
Joint Effect ◽  
Two Dimensional ◽  
Inorganic Substances ◽  
Metal Dichalcogenides ◽  
Interaction Screening

AbstractWe study the joint effect of disorder and Coulomb interaction screening on the exciton spectra in two-dimensional (2D) structures. These can be van der Waals structures or heterostructures of organic (polymeric) semiconductors as well as inorganic substances like transition metal dichalcogenides. We consider 2D screened hydrogenic problem with Rytova–Keldysh interaction by means of so-called fractional Scrödinger equation. Our main finding is that above synergy between screening and disorder either destroys the exciton (strong screening) or promote the creation of a bound state, leading to its collapse in the extreme case. Our second finding is energy levels crossing, i.e. the degeneracy (with respect to index $$\mu $$ μ ) of the exciton eigenenergies at certain discrete value of screening radius. Latter effects may also be related to the quantum manifestations of chaotic exciton behavior in above 2D semiconductor structures. Hence, they should be considered in device applications, where the interplay between dielectric screening and disorder is important.

scholarly journals Atomic Bonding and Electronic Binding Energy of Two-Dimensional Bi/Li(110) Heterojunctions via BOLS-BB Model

ACS Omega ◽  
2021 ◽  
Vol 6 (4) ◽  
pp. 3252-3258
Author(s):  
Maolin Bo ◽  
Liangjing Ge ◽  
Jibiao Li ◽  
Lei Li ◽  
Chuang Yao ◽  
...  
Keyword(s):  
Binding Energy ◽  
Two Dimensional

Phase time for coherent transport in two‐dimensional structures

1996 ◽  
Vol 69 (5) ◽  
pp. 629-631
Author(s):  
Antonio Abramo ◽  
Paolo Casarini ◽  
Carlo Jacoboni
Keyword(s):  
Two Dimensional ◽  
Coherent Transport ◽  
Phase Time

scholarly journals Using a Tunable Quantum Wire To Measure the Large out-of-Plane Spin Splitting of Quasi Two-Dimensional Holes in a GaAs Nanostructure

Nano Letters ◽  
2012 ◽  
Vol 13 (1) ◽  
pp. 148-152 ◽  
Author(s):  
A. Srinivasan ◽  
L. A. Yeoh ◽  
O. Klochan ◽  
T. P. Martin ◽  
J. C. H. Chen ◽  
...  
Keyword(s):  
Quantum Wire ◽  
Spin Splitting ◽  
Two Dimensional ◽  
Out Of Plane

Effects of two‐dimensional confinement on the optical properties of InGaAs/InP quantum wire structures

1988 ◽  
Vol 53 (11) ◽  
pp. 995-997 ◽  
Author(s):  
D. Gershoni ◽  
H. Temkin ◽  
G. J. Dolan ◽  
J. Dunsmuir ◽  
S. N. G. Chu ◽  
...  
Keyword(s):  
Optical Properties ◽  
Quantum Wire ◽  
Two Dimensional

Publisher’s Note: Magnetoresistance effects and phase coherent transport phenomena in a magnetic nonplanar two-dimensional hole system [Phys. Rev. B84, 205302 (2011)]

2011 ◽  
Vol 84 (19) ◽  
Author(s):  
Stefan Knott ◽  
Thomas Ch. Hirschmann ◽  
Ursula Wurstbauer ◽  
Wolfgang Hansen ◽  
Werner Wegscheider
Keyword(s):  
Transport Phenomena ◽  
Two Dimensional ◽  
Coherent Transport

scholarly journals Positive and Negative Donor Impurity in an InAs/AlAs Quantum Wire

2010 ◽  
Vol 2 (3) ◽  
pp. 433
Author(s):  
N. Arunachalam ◽  
A. J. Peter
Keyword(s):  
Binding Energy ◽  
Quantum Wire ◽  
Optical Transition ◽  
Binding Energies ◽  
Impurity Level ◽  
Wire Radius ◽  
Emission Energy ◽  
Interband Optical Transition ◽  
Mass Approximation ◽  
Charged Donor

Binding energies of positive and negative charged donor impurities in an InAs/AlAs cylindrical quantum wire are investigated. Numerical calculations are performed using the variational procedure within the single band effective mass approximation. We assume that the impurity is located at the axis of the wire. The interband optical transition with and without the exciton is computed as a function of wire radius. The valence-band anisotropy is included in our theoretical model by using different hole masses in different spatial directions. Neutral shallow donors comprise a positively charged donor and a single bound electron. It is observed that (i) negative trions have a higher binding energy than positive trions, (ii) the binding energy of the heavy-hole exciton is much larger than that of the light-hole exciton due to different hole mass values (iii) the exciton binding energy and the interband emission energy are both increased when the radius of the cylindrical quantum wire is decreased and (iv) the effect of exciton influences the interband emission energy. Our results are in good agreement with the recent published results. Keywords: Quantum wire; Impurity level; Binding energy; Excitons. © 2010 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved. DOI: 10.3329/jsr.v2i3.4715                 J. Sci. Res. 2 (3), 433-441 (2010)  

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