A systematic study of the electron mobility in V-shaped quantum wires at low temperatures

Tsetseri, Maria; Triberis, G. P.; Tsaousidou, M.

doi:10.1016/j.spmi.2008.01.010

Cited by 5 publications

(3 citation statements)

References 27 publications

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“…The electrical transport properties of disordered materials has been an active research topic for many years. In recent years, the realization of innovative applications in nanotechnology has especially generated a widespread interest in the transport properties of one-dimensional (1D) systems, such as carbon nanotubes, nanowires and conducting molecules, with DNA being placed among the most promising materials [1][2][3][4][5][6][7][8][9][10][11][12][13]. In these systems the presence of disorder may severely affect the character of the carriers and the transport mechanism, while external stimuli, such as finite electric fields and temperature 1 Author to whom any correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

The effect of correlations on the non-ohmic behavior of the small-polaron hopping conductivity in 1D and 3D disordered systems

Dimakogianni

Triberis²

2010

J. Phys.: Condens. Matter

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According to percolation theory the investigation of charge transport in disordered systems is equivalent to the study of the possibility of the passage of the carriers through a random network of impedances which interconnect the different lattice sites. When the site energies are not the same, the energy of a site affects the incoming as well as the outgoing impedances connected to the given site and this gives rise to correlations between neighboring impedances. This new condition characterizes the transport process and imposes the evaluation of the average number of sites accessible by a bond from a given site for all possible configurations of sites that satisfy the percolation condition. The generalized molecular crystal model, appropriate for the study of small-polaron hopping transport in disordered systems, and the Kubo formula permit the evaluation of these impedances. Taking correlations into account, theoretical percolation considerations applicable to one-dimensional and three-dimensional disordered systems, lead to analytical expressions for the temperature and electric field dependence of the DC conductivity at high (multi-phonon-assisted hopping) and low (few-phonon-assisted hopping) temperatures. The theoretical analysis reveals the effect of correlations on the non-ohmic behavior of the small-polaron hopping conductivity and permits the evaluation of the maximum hopping distance. Quantitative estimates of this effect are presented comparing the theoretical results, including correlations with those ignoring them, previously reported, applying them to recent experimental data for a wide temperature range and from low up to moderate electric fields.

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Section: Introductionmentioning

confidence: 99%

The effect of correlations on the non-ohmic behavior of the small-polaron hopping conductivity in 1D and 3D disordered systems

Dimakogianni

Triberis²

2010

J. Phys.: Condens. Matter

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“…Among the earlier works in this group we find several experimental studies on the optical properties of V-groove QWWs [3,4] and the nonlinear optics in CdSe and GaAs QWWs [5]; as well as the report on room temperature lasing [6], and on photoluminescence [9] of V-groove QWWs. The low-temperature electron mobility in V-shaped QWWs was calculated by Tsetseri et al [10]. There are also works regarding exciton states, magnetoexcitons and exciton-related optical properties [13,19,21,22]; and even a report on electron g-factor in QWWs in the presence of spinorbit Rashba coupling and magnetic field [23].…”

Section: Introductionmentioning

confidence: 94%

Impurity-related linear and nonlinear optical response in quantum-well wires with triangular cross section

Duque

Mora-Ramos

Kasapoğlu

et al. 2013

Journal of Luminescence

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The 1s-like and 2p-like donor impurity energy states are studied in a semiconductor quantum wire of equilateral triangular cross section as functions of the impurity position and the geometrical size of the structure. Linear and nonlinear coefficients for the optical absorption and relative refractive index change associated with 1s-2p transitions are calculated for both the x-polarization and y-polarization of the incident light. The results show a mixed effect of redshift and blueshift depending on the location of the donor atom. Also, strong nonlinear contributions to the optical absorption coefficient are obtained for both polarizations in the on-center impurity case.

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“…Nowadays, with the advances in nanofabrication technologies like R. Khordad & H. Bahramiyan epitaxial techniques and metal-organic chemical vapor deposition, [6][7][8] it is possible for researchers to fabricate quantum wire structures of nanometer size with various cross-sections such as triangular, parallelogram, V-shape, T-shape, square, circular and hexagonal. [9][10][11][12] For example, Tsetseri et al 13 calculated the low-temperature electron mobility in V-shaped quantum well wires. Mohan et al 14 investigated the spectrum of luminescent hexagon superlattice, created by InP/InAs/InP nanotubes with the transversal cross-section of right hexagon shape.…”

Section: Introductionmentioning

confidence: 99%

The energy levels, binding energy and third harmonic generation of a hexagon-shaped quantum wire

Khordad

Bahramiyan

2015

Mod. Phys. Lett. B

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In this paper, we have studied the effect of impurity on the energy levels and nonlinear optical properties of a hexagon-shaped quantum wire using finite element method (FEM). We have obtained the energy eigenvalues, their corresponding eigenfunctions and third harmonic generation (THG) with and without impurity for different sizes of inner a 1 and outer a 2 hexagons. It is found that all energy levels are decreased with increasing a 1 . There is degeneracy between energy levels without impurity. But, there is no degeneracy between the energy levels in the presence of impurity. The dipole matrix elements are increased with enhancing hexagon sizes without impurity. But, these elements have complex behaviors with impurity. The THG increases and shifts toward lower energies by enhancing a 1 . The influence of a 2 /a 1 on THG is not large when a 2 /a 1 > 2. The THG shifts toward lower energies by increasing impurity position.

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A systematic study of the electron mobility in V-shaped quantum wires at low temperatures

Cited by 5 publications

References 27 publications

The effect of correlations on the non-ohmic behavior of the small-polaron hopping conductivity in 1D and 3D disordered systems

The effect of correlations on the non-ohmic behavior of the small-polaron hopping conductivity in 1D and 3D disordered systems

Impurity-related linear and nonlinear optical response in quantum-well wires with triangular cross section

The energy levels, binding energy and third harmonic generation of a hexagon-shaped quantum wire

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