scholarly journals Electrically controlled crossing of energy levels in quantum dots in two-dimensional topological insulators

2017 ◽  
Vol 513 ◽  
pp. 1-6 ◽  
Author(s):  
Aleksei A. Sukhanov
Keyword(s):  
Quantum Dots ◽  
Topological Insulators ◽  
Energy Levels ◽  
Two Dimensional

scholarly journals Electronic Properties of Multi-Ablooms Flower-Like Quantum Dots: a 2- D Finite Element Study

2021 ◽  
Author(s):  
mehrzad ghorbani
Keyword(s):  
Quantum Dots ◽  
Finite Element ◽  
Electronic Properties ◽  
Energy Levels ◽  
Two Dimensional ◽  
Matrix Elements ◽  
Finite Element Approach ◽  
Domain Shape ◽  
Element Approach ◽  
Element Study

Abstract In this paper, we investigated the electronic properties of two dimensional multi-abloom nanoflower. Also, we approximated a typical form of the Schrödinger equation through an appropriate 2-D finite element approach, and then, we have investigated the effects of different parameters such as number of ablooms, number of rose, variety geometric domain shape and systems size on the energy levels, eigenfunctions, and dipole matrix elements.

Two-dimensional topological insulators exfoliated from Na3Bi-like Dirac semimetals

2021 ◽  
Author(s):  
Xiaoqiu Guo ◽  
Ruixin Yu ◽  
Jingwen Jiang ◽  
Zhuang Ma ◽  
Xiuwen Zhang
Keyword(s):  
Physical Properties ◽  
Epitaxial Growth ◽  
Topological Insulators ◽  
2D Materials ◽  
Van Der Waals ◽  
Two Dimensional ◽  
Dirac Semimetals

Topological insulation is widely predicted in two-dimensional (2D) materials realized by epitaxial growth or van der Waals (vdW) exfoliation. Such 2D topological insulators (TI’s) host many interesting physical properties such...

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.

Electrochemiluminescent chiral discrimination with chiral Ag2S quantum dots/few-layer carbon nitride nanosheets

The Analyst ◽  
2021 ◽  
Author(s):  
Qianqian Zhao ◽  
Wenrong Cai ◽  
Bao-Zhu Yang ◽  
Zhengzhi Yin ◽  
Datong Wu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Carbon Nitride ◽  
Chiral Discrimination ◽  
Chiral Ligand ◽  
Two Dimensional ◽  
Ag2s Quantum Dots ◽  
Carbon Nitride Nanosheets

Well dispersed chiral Ag2S quantum dots (Ag2S QDs) were facilely synthesized by using N-acetyl-L-cysteine (NALC) as the chiral ligand, which were loaded onto the nanosheets of two-dimensional (2D) few-layer carbon...

scholarly journals A two-dimensional array of single-hole quantum dots

2021 ◽  
Vol 118 (4) ◽  
pp. 044002
Author(s):  
F. van Riggelen ◽  
N. W. Hendrickx ◽  
W. I. L. Lawrie ◽  
M. Russ ◽  
A. Sammak ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Two Dimensional ◽  
Dimensional Array ◽  
Single Hole

scholarly journals NONCOMMUTATIVE GRAPHENE

2013 ◽  
Vol 28 (16) ◽  
pp. 1350064 ◽  
Author(s):  
CATARINA BASTOS ◽  
ORFEU BERTOLAMI ◽  
NUNO COSTA DIAS ◽  
JOÃO NUNO PRATA
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Dirac Equation ◽  
Energy Levels ◽  
Dirac Fermions ◽  
Two Dimensional ◽  
Dirac System ◽  
Noncommutative Parameter

We consider a noncommutative description of graphene. This description consists of a Dirac equation for massless Dirac fermions plus noncommutative corrections, which are treated in the presence of an external magnetic field. We argue that, being a two-dimensional Dirac system, graphene is particularly interesting to test noncommutativity. We find that momentum noncommutativity affects the energy levels of graphene and we obtain a bound for the momentum noncommutative parameter.

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