scholarly journals QUANTUM TRANSPORT THROUGH HETEROCYCLIC MOLECULES

2009 ◽  
Vol 23 (02) ◽  
pp. 177-187
Author(s):  
SANTANU K. MAITI ◽  
S. N. KARMAKAR
Keyword(s):  
Electron Transport ◽  
Transport Properties ◽  
Energy Levels ◽  
Tight Binding ◽  
Molecular Transport ◽  
Molecular Wires ◽  
Function Technique ◽  
Binding Model ◽  
Heterocyclic Molecules ◽  
Electron Transport Properties

We explore electron transport properties in molecular wires made of heterocyclic molecules (pyrrole, furan and thiophene) by using the Green's function technique. Parametric calculations are given based on the tight-binding model to describe the electron transport in these wires. It is observed that the transport properties are significantly influenced by (a) the heteroatoms in the heterocyclic molecules and (b) the molecule-to-electrodes coupling strength. Conductance (g) shows sharp resonance peaks associated with the molecular energy levels in the limit of weak molecular coupling, while they get broadened in the strong molecular coupling limit. These resonances get shifted with the change of the heteroatoms in these heterocyclic molecules. All the essential features of the electron transfer through these molecular wires become much more clearly visible from the study of our current-voltage (I-V) characteristics, and they provide several key information in the study of molecular transport.

scholarly journals ELECTRON TRANSPORT THROUGH MULTILEVEL QUANTUM DOT

2008 ◽  
Vol 07 (01) ◽  
pp. 51-61 ◽  
Author(s):  
SANTANU K. MAITI
Keyword(s):  
Electron Transport ◽  
Transport Properties ◽  
Energy Levels ◽  
Tight Binding ◽  
Current Amplitude ◽  
Function Technique ◽  
Noise Power ◽  
Disorder Strength ◽  
Binding Model ◽  
Surface Disorder

Quantum transport properties through some multilevel quantum dots sandwiched between two metallic contacts are investigated by the use of Green's function technique. Here, we do parametric calculations, based on the tight-binding model, to study the transport properties through such bridge systems. The electron transport properties are significantly influenced by (a) the number of quantized energy levels in the dots, (b) the dot-to-electrodes coupling strength, (c) the location of the equilibrium Fermi energy E F , and (d) the surface disorder. In the limit of weak-coupling, the conductance (g) shows sharp resonance peaks associated with the quantized energy levels in the dots, while, they get substantial broadening in the strong-coupling limit. The behavior of the electron transfer through these systems becomes much more clearly visible from our study of the current–voltage (I–V) characteristics. In this context, we also describe the noise power of current fluctuations (S) and determine the Fano factor (F) which provides an important information about the electron correlation among the charge carriers. Finally, we explore a novel transport phenomenon by studying the surface disorder effect in which the current amplitude increases with the increase of the surface disorder strength in the strong disorder regime, while, the amplitude decreases in the limit of weak disorder. Such an anomalous behavior is completely opposite to that of bulk disordered system where the current amplitude always decreases with the disorder strength. It is also observed that the current amplitude strongly depends on the system size which reveals the finite quantum size effect.

scholarly journals Quantum Transport in Bridge Systems

2009 ◽  
Vol 155 ◽  
pp. 71-85 ◽  
Author(s):  
Santanu K. Maiti
Keyword(s):  
Electron Transport ◽  
Quantum Interference ◽  
Tight Binding ◽  
Molecular Wires ◽  
Function Technique ◽  
Electron Conduction ◽  
Model Calculations ◽  
Electron Transport Properties ◽  
Physical Insight ◽  
Coupling Strengths

We study electron transport properties of some molecular wires and a unconventional disordered thin film within the tight-binding framework using Green's function technique. We show that electron transport is significantly affected by quantum interference of electronic wave functions, molecule-to-electrode coupling strengths, length of the molecular wire and disorder strength. Our model calculations provide a physical insight to the behavior of electron conduction across a bridge system.

ELECTRON TRANSPORT THROUGH MOLECULAR CHAINS

NANO ◽  
2007 ◽  
Vol 02 (02) ◽  
pp. 103-108 ◽  
Author(s):  
SANTANU K. MAITI
Keyword(s):  
Steady State ◽  
Electron Transport ◽  
Shot Noise ◽  
Coupling Strength ◽  
Tight Binding ◽  
Function Technique ◽  
Current Fluctuations ◽  
Tight Binding Model ◽  
Binding Model ◽  
Steady State Current

We study electron transport through molecular chains attached with two nonsuperconducting electrodes by the use of Green's function technique. Here, we do parametric calculations based on the tight-binding model to characterize the electron transport through such bridge systems and see that the transport properties are significantly affected by (a) the length of the molecular chain and (b) the molecule-to-electrode coupling strength. In this context, we also discuss the steady state current fluctuations, so-called shot noise, which is a consequence of the quantization of charge and is not directly available through conductance measurements.

Tuning the structures and electron transport properties of ultrathin Cu nanowires by size and bending stress using DFT and DFTB methods

RSC Advances ◽  
2015 ◽  
Vol 5 (29) ◽  
pp. 22463-22470 ◽  
Author(s):  
C. He ◽  
G. Liu ◽  
W. X. Zhang ◽  
Z. Q. Shi ◽  
S. L. Zhou
Keyword(s):  
Electron Transport ◽  
Transport Properties ◽  
Density Functional ◽  
Tight Binding ◽  
Bending Stress ◽  
Functional Theory ◽  
Flexible Displays ◽  
Cu Nanowires ◽  
Bending Stresses ◽  
Electron Transport Properties

Electron transport properties of ultrathin Cu nanowires with diameters of 0.2–1.0 nm under different bending stresses are reported, using density functional theory and density-functional-based tight-binding approaches, for application in flexible displays and solar cells.

Magnetic and electron transport properties of Co2Si nanomagnets

2021 ◽  
Vol 5 (2) ◽  
Author(s):  
Balamurugan Balasubramanian ◽  
Tom A. George ◽  
Priyanka Manchanda ◽  
Rabindra Pahari ◽  
Ahsan Ullah ◽  
...  
Keyword(s):  
Electron Transport ◽  
Transport Properties ◽  
Electron Transport Properties

Printable Single-Unit-Cell-Thick Transparent Zinc-Doped Indium Oxides with Efficient Electron Transport Properties

ACS Nano ◽  
2021 ◽  
Author(s):  
Azmira Jannat ◽  
Nitu Syed ◽  
Kai Xu ◽  
Md. Ataur Rahman ◽  
Md. Mehdi Masud Talukder ◽  
...  
Keyword(s):  
Electron Transport ◽  
Transport Properties ◽  
Single Unit ◽  
Unit Cell ◽  
Electron Transport Properties ◽  
Indium Oxides

In-situ photoconductivity measurement of imidazole in optical fiber break-junctions

2021 ◽  
Author(s):  
Zhikai Zhao ◽  
Chenyang Guo ◽  
Lifa Ni ◽  
Xueyan Zhao ◽  
Surong Zhang ◽  
...  
Keyword(s):  
Electron Transport ◽  
Optical Fiber ◽  
Transport Properties ◽  
Molecular Junctions ◽  
Break Junction ◽  
Break Junctions ◽  
Fiber Break ◽  
Electron Transport Properties ◽  
Photoconductivity Measurement

We develop a method based on the mechanically controllable break junction technique to investigate the electron transport properties of single molecular junctions upon fiber waveguided light. In our strategy, a...

Sign in / Sign up

Export Citation Format

Share Document