Carrier Dynamics in Skutterudites

2013 ◽  
Author(s):  
Liang Guo ◽  
Xianfan Xu
Keyword(s):  
Ultrafast Spectroscopy ◽  
Electronic Band Structure ◽  
Wavelength Dependence ◽  
Electronic Energy ◽  
Carrier Dynamics ◽  
Probe Laser ◽  
Optical Parametric Amplifier ◽  
Electronic Band ◽  
Optical Parametric ◽  
Electronic Energy Level

Ultrafast spectroscopy was used to measure the transient reflectance signal of skutterudites excited by femtosecond laser. By utilizing optical parametric amplifier (OPA), probe laser with various wavelengths was generated to detect the dynamics of varying electronic energy level, which provides information about the electronic band structure. The wavelength dependence of the relaxation process is discussed.

A consolidated account of electrochemical determination of band structure parameters in II–VI semiconductor quantum dots: a tutorial review

2019 ◽  
Vol 21 (9) ◽  
pp. 4695-4716 ◽  
Author(s):  
Pravin Popinand Ingole
Keyword(s):  
Quantum Dots ◽  
Band Structure ◽  
Electronic Band Structure ◽  
Energy Levels ◽  
Electrochemical Determination ◽  
Electronic Energy ◽  
Semiconductor Quantum Dots ◽  
Electronic Band ◽  
Nano Structure ◽  
Electronic Energy Levels

Probing absolute electronic energy levels in semiconductor quantum dots (Q-dots) is crucial for engineering their electronic band structure and hence for precise design of composite nano-structure based devices.

Electronic Energy Bands in γ-InSe with and without Intercalated Lithium

1990 ◽  
Vol 210 ◽  
Author(s):  
P. Gomes Da Costa ◽  
M. Balkanski ◽  
R. F. WALLIS
Keyword(s):  
Lithium Atom ◽  
Electronic Band Structure ◽  
Tight Binding ◽  
Electronic Energy ◽  
Band Gaps ◽  
Energy Bands ◽  
Energy Position ◽  
Electronic Band ◽  
Direct Band ◽  
Electronic Energy Bands

AbstractThe effect of intercalated lithium on the electronic band structure of the γ-polytype of InSe has been investigated using a tight-binding method. The energy bands of the pure polytype were calculated and the results compared with previous work. The modifications of the energy bands produced by the introduction of one lithium atom per unit cell were calculated for the lowest potential energy position of the lithium atom in the Van der Waals gap between layers. The results for the changes in the smallest and next-to-smallest direct band gaps are compared with experimental data. An interpretation of a photoluminescence peak produced by lithium intercalation is given.

ELECTRONIC BAND STRUCTURE OF CARBON NANOTUBES WITH QUINOID STRUCTURE

2013 ◽  
Vol 27 (25) ◽  
pp. 1350179
Author(s):  
NGUYEN NGOC HIEU ◽  
NGUYEN PHAM QUYNH ANH
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Band Structure ◽  
Electronic Band Structure ◽  
Tight Binding ◽  
Electronic Energy ◽  
Electronic Band ◽  
Tight Binding Approximation ◽  
Quinoid Structure ◽  
Structure Of Carbon Nanotubes

In this paper, we fully describe the geometry of atomic structure of carbon nanotube with quinoid structure. Electronic energy band structure of carbon nanotubes with quinoid structure is studied by tight-binding approximation. In the presence of bond alternation, calculations show that only armchair (n, n) carbon nanotube (without twisting) remains metallic and zigzag (3ν - 1, -3ν + 1) CNT becomes metallic at the critical elongation. Effect of deformation on the change of band gap is also calculated and discussed.

Electronic structure of helically coiled carbon nanotubes

2005 ◽  
Vol 901 ◽  
Author(s):  
Gian Giacomo Guzman-Verri ◽  
Lok C. Lew Yan Voon ◽  
Morten Willatzen ◽  
Jens Gravesen
Keyword(s):  
Carbon Nanotubes ◽  
Band Structure ◽  
Electronic Band Structure ◽  
Electronic Energy ◽  
Electronic Band ◽  
Curvature Effects ◽  
Helical Carbon Nanotubes ◽  
Coil Diameter ◽  
Curvature Energy ◽  
Effective Mass Approach

AbstractIn the present work we calculate the electronic band structure of single-wall helical carbon nanotubes following an effective-mass approach. We include curvature effects and strain due to bending in the band structure. The curvature energy ΔE, and the change in the electronic energy ΔEs due to strain, depend upon the coil pitch and coil diameter of the tube. We find 0.003 ≤|ΔE|≤ 1.3 eV and 0 ≤ΔEs ≤ 4.0 eV for the single-wall helical carbon nanotubes considered here.

scholarly journals Development of Ultrashort Pulse Lasers for Ultrafast Spectroscopy

Photonics ◽  
2018 ◽  
Vol 5 (3) ◽  
pp. 19 ◽  
Author(s):  
Takayoshi Kobayashi
Keyword(s):  
Ultrashort Pulse ◽  
Ultrafast Spectroscopy ◽  
Parametric Amplifier ◽  
Optical Parametric Amplifier ◽  
Optical Parametric ◽  
Ultrashort Pulse Lasers ◽  
Ultraviolet Lasers ◽  
Parametric Processes

Principles and information obtained by ultrafast spectroscopy and scheme of optical parametric amplifier are discussed. Realization of ultrashort visible and ultraviolet lasers based on the parametric processes are discussed.

The Spin-Resolved Electronic Band Structure of Cadmium Oxide Doped with Transition Elements

2013 ◽  
Vol 200 ◽  
pp. 123-128 ◽  
Author(s):  
Stepan Syrotyuk ◽  
Vira Shved
Keyword(s):  
Electronic Band Structure ◽  
Cadmium Oxide ◽  
Transition Element ◽  
Electronic Energy ◽  
Total Density ◽  
Transition Elements ◽  
Energy Bands ◽  
Strong Electron ◽  
Electronic Band ◽  
Electronic Energy Bands

The spin-resolved electronic energy bands and partial and total density of states of cadmium oxide doped with Sc, Ti and Cr have been evaluated by means of the ABINIT code. The strong electron correlations of Cd 4d and transition element 3d states have been taken into account. It was found that the CdScO and CdTiO crystals are paramagnetic and CdCrO shows the ferromagnetic ordering.

scholarly journals The recurrent relations for the electronic band structure of the multilayer graphene

2018 ◽  
Vol 474 (2220) ◽  
pp. 20180439 ◽  
Author(s):  
V. N. Davydov
Keyword(s):  
Band Structure ◽  
Electronic Band Structure ◽  
Electronic Energy ◽  
Multilayer Graphene ◽  
Energy Bands ◽  
Linear Dispersion ◽  
Electronic Band ◽  
Tight Binding Approximation ◽  
Number Of Layers ◽  
Recurrent Relations

The structure of the electronic energy bands for stacked multilayer graphene is developed using the tight-binding approximation (TBA). The spectra of the Dirac electrons are investigated in vicinity of the Brillouin zone minima. The electron energy dependence on quasi-momentum is established for an arbitrary number of the graphene layers for multilayer graphene having even number of layers N  = 2 n , ( n  = 2, 3, 4, …) with the Bernal stacking ABAB … AB; or for odd number of layers N  = 2 n  + 1, ( n  = 1, 2, 3, …) with stacking ABAB … A. It is shown that four non-degenerate energy branches of the electronic energy spectrum are present for any number of layers. Degeneracy is considered of graphene-like energy branches with linear dispersion law. Dependences of such branches number and their degeneracy are found on number of layers. The recurrent relations are obtained for the electronic band structure of the stacked ABA…, ABC… and AAA… multilayer graphene. The flat electronic bands are obtained for ABC-stacked multilayer graphene near the K -point at the Fermi level. Such an approach may be useful in the study of multivarious aspects of graphene's physics and nanotechnologies. Also paper gives new hints for deeper studies of graphite intercalation compounds.

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