Electronic and optical properties of core–shell nanowires in a magnetic field

In this paper, electronic and optical properties of GaN/InN core/shell nanowires (CSNWs) have been theoretically investigated through the first principles calculations. The binding energy of In and N atoms on surface of six crystal planes along the [Formula: see text]-axis of GaN nanowires are all negative, which indicate that In and N atoms can be effectively deposited on the surface of GaN nanowires and preparing GaN/InN CSNWs is feasible theoretically. Calculation results of electronic properties indicate that the core/shell ratio and diameter of GaN/InN CSNWs have significant effect on the band structure, bandgap can be effectively adjusted when keeping the number of GaN layers unchanged and changing the number of InN layers. Moreover, with the increase in the number of InN layers, the absorption spectrum of GaN/InN CSNW has significant redshift and few weak absorption peaks appear in the visible light region.

Download Full-text

Orientation dependent electronic and optical properties of ZnS nanowires and ZnS—Si core shell nanowires

Applied Surface Science ◽

10.1016/j.apsusc.2019.04.251 ◽

2019 ◽

Vol 486 ◽

pp. 539-545 ◽

Cited By ~ 3

Author(s):

Shafiq Ur Rehman ◽

Muhammad Hafeez ◽

Waqar Uddin ◽

Sayed Ali Khan ◽

Qixiao Lu ◽

...

Keyword(s):

Optical Properties ◽

Core Shell ◽

Electronic And Optical Properties ◽

Shell Nanowires

Download Full-text

Electronic and optical properties of GaN/AlN core–shell nanowires

Modern Physics Letters B ◽

10.1142/s0217984920500219 ◽

2019 ◽

Vol 34 (02) ◽

pp. 2050021 ◽

Cited By ~ 4

Author(s):

Jiangshan Zheng ◽

Enling Li ◽

Jie Yan ◽

Zhen Cui ◽

Deming Ma

Keyword(s):

Optical Properties ◽

Band Gap ◽

Electromagnetic Waves ◽

Density Functional ◽

Field Energy ◽

Core Shell ◽

Functional Theory ◽

Electronic And Optical Properties ◽

Ultraviolet Range ◽

Shell Nanowires

The electronic and optical properties of GaN/AlN core–shell nanowires (NWs) with different core–shell ratios are studied by means of density functional theory (DFT). The results show that as the GaN core structure increases (the AlN shell remains unchanged), the band gap of NWs decreases. In contrast, with the increase of AlN shell (GaN nucleus remains unchanged), the band gap almost remains unchanged. That is to say the adjustment capability of core–shell ratio for the band gap of GaN/AlN core–shell NWs with the same diameter of GaN core degenerates, and the band gap of which are mainly controlled by GaN core. Ga–N bond and Al–N bond show a strong ionic property because of the electronegativity of N is strong over Ga and Al. In addition, the calculated results of the real part [Formula: see text] and the imaginary parts [Formula: see text] with photon energy indicate that the storage capability and loss of the NWs to electric field energy are different with the content of AlN. The four structured NWs reflect electromagnetic waves as conductor in a high frequency ultraviolet range. The results are valuable for the design of GaN/AlN core–shell NWs optoelectronic nanodevices and the research of other core–shell NWs heterostructures.

Download Full-text

Magnetic field dependence of the electronic and optical properties of silicene quantum dots

Solid State Communications ◽

10.1016/j.ssc.2021.114219 ◽

2021 ◽

Vol 327 ◽

pp. 114219

Author(s):

X.F. Yan ◽

Q. Chen ◽

W. Pei ◽

J.Z. Peng

Keyword(s):

Magnetic Field ◽

Quantum Dots ◽

Optical Properties ◽

Field Dependence ◽

Magnetic Field Dependence ◽

Electronic And Optical Properties

Download Full-text

Terahertz emission from GaAs-AlGaAs core-shell nanowires on Si (100) substrate: Effects of applied magnetic field and excitation wavelength

Applied Physics Letters ◽

10.1063/1.4791570 ◽

2013 ◽

Vol 102 (6) ◽

pp. 063101 ◽

Cited By ~ 16

Author(s):

Jasher John Ibanes ◽

Ma. Herminia Balgos ◽

Rafael Jaculbia ◽

Arnel Salvador ◽

Armando Somintac ◽

...

Keyword(s):

Magnetic Field ◽

Applied Magnetic Field ◽

Excitation Wavelength ◽

Core Shell ◽

Terahertz Emission ◽

Substrate Effects ◽

Shell Nanowires

Download Full-text

Robust topological phase in proximitized core–shell nanowires coupled to multiple superconductors

Beilstein Journal of Nanotechnology ◽

10.3762/bjnano.9.142 ◽

2018 ◽

Vol 9 ◽

pp. 1512-1526 ◽

Cited By ~ 6

Author(s):

Tudor D Stanescu ◽

Anna Sitek ◽

Andrei Manolescu

Keyword(s):

Magnetic Field ◽

Longitudinal Magnetic Field ◽

Tight Binding ◽

Core Shell ◽

Topological Phase ◽

Binding Model ◽

Chemical Potentials ◽

Topological Quantum ◽

The Stability ◽

Shell Nanowires

We consider core–shell nanowires with prismatic geometry contacted with two or more superconductors in the presence of a magnetic field applied parallel to the wire. In this geometry, the lowest energy states are localized on the outer edges of the shell, which strongly inhibits the orbital effects of the longitudinal magnetic field that are detrimental to Majorana physics. Using a tight-binding model of coupled parallel chains, we calculate the topological phase diagram of the hybrid system in the presence of non-vanishing transverse potentials and finite relative phases between the parent superconductors. We show that having finite relative phases strongly enhances the stability of the induced topological superconductivity over a significant range of chemical potentials and reduces the value of the critical field associated with the topological quantum phase transition.

Download Full-text