scholarly journals Molecular Wire Interconnects: Chemical Structural Control, Resonant Tunneling and Length Dependence

VLSI Design ◽  
1998 ◽  
Vol 8 (1-4) ◽  
pp. 65-74 ◽  
Author(s):  
Mathieu Kemp ◽  
Vladimiro Mujica ◽  
Adrian Roitberg ◽  
Mark A. Ratner
Keyword(s):  
Coulomb Blockade ◽  
Structural Control ◽  
Resonant Tunneling ◽  
Molecular Wires ◽  
Molecular Wire ◽  
Gate Electrodes ◽  
Length Dependence ◽  
Nonlinear Conductance ◽  
Molecular Conductance ◽  
Tunneling Behavior

Molecular wires have several promising features, that would appear to make them ideal for advanced interconnects in nanoscale electronic devices. We discuss several aspects of the linear and nonlinear conductance of molecular wire interconnects. Topics include energy dependence of molecular conductance, resonant tunneling behavior, control of conductance by molecular structure and geometry, length dependence including the tunneling regime energetics. Design rules using molecular interconnects will differ substantially from those with more standard, lithographically structured silicon interconnects. In particular, the dissipation mechanisms will differ, both tunneling and ballistic regimes should be available, coulomb blockade and staircase behavior will be observed (but under differing conditions) and fabrication of gate electrodes is a challenge.

scholarly journals Controlling Quantum Interference by Regulating Charge on the Bridging N Atom of Pyrrolodipyridine Molecular Junctions

2019 ◽  
Author(s):  
Saman Naghibi ◽  
Ali K. Ismael ◽  
Andrea Vezzoli ◽  
Mohsin K. Al-Khaykanee ◽  
Xijia Zheng ◽  
...  
Keyword(s):  
Quantum Interference ◽  
Molecular Wires ◽  
Molecular Junctions ◽  
Scanning Probe ◽  
Molecular Wire ◽  
Interference Effects ◽  
Electronic Density ◽  
Molecular Conductance

<b>Control of quantum interference features</b>: molecular junctions incorporating pyrrolodipyridine-based molecular wires were fabricated by scanning probe methods. Quantum interference effects were introduced by employing <i>meta</i>-connected molecules, and modulated in magnitude by changing the substituent on the pyrrolic N. Dramatic changes in molecular conductance and DFT transport calculations demonstrate the storng effect that small changes in electronic density can have on the overall conductance of a molecular wire.

scholarly journals Controlling Quantum Interference by Regulating Charge on the Bridging N Atom of Pyrrolodipyridine Molecular Junctions

2019 ◽  
Author(s):  
Saman Naghibi ◽  
Ali K. Ismael ◽  
Andrea Vezzoli ◽  
Mohsin K. Al-Khaykanee ◽  
Xijia Zheng ◽  
...  
Keyword(s):  
Quantum Interference ◽  
Molecular Wires ◽  
Molecular Junctions ◽  
Scanning Probe ◽  
Molecular Wire ◽  
Interference Effects ◽  
Electronic Density ◽  
Molecular Conductance

<b>Control of quantum interference features</b>: molecular junctions incorporating pyrrolodipyridine-based molecular wires were fabricated by scanning probe methods. Quantum interference effects were introduced by employing <i>meta</i>-connected molecules, and modulated in magnitude by changing the substituent on the pyrrolic N. Dramatic changes in molecular conductance and DFT transport calculations demonstrate the storng effect that small changes in electronic density can have on the overall conductance of a molecular wire.

The Quantum Length Dependence of Conductance in Molecular Device: An Ab Initio Study

2010 ◽  
Vol 663-665 ◽  
pp. 519-522
Author(s):  
Cai Juan Xia ◽  
Han Chen Liu ◽  
Ying Tang Zhang
Keyword(s):  
Electronic Transport ◽  
First Principles ◽  
Electronic Structures ◽  
Density Functional ◽  
Molecular Device ◽  
Functional Theory ◽  
Length Dependence ◽  
Molecular Conductance ◽  
Homo Lumo ◽  
Molecular Compounds

By Applying Nonequilibrium Green’s Function Formalism Combined First-Principles Density Functional Theory, we Investigate the Electronic Transport Properties of Thiophene and Furan Molecules with Different Quantum Length. the Influence of HOMO-LUMO Gaps and the Spatial Distributions of Molecular Orbitals on the Electronic Transport through the Molecular Device Are Discussed in Detail. the Results Show that the Transport Behaviors Are Determined by the Distinct Electronic Structures of the Molecular Compounds. the Length Dependence of Molecular Conductance Exhibits its Diversity for Different Molecules.

Coulomb blockade of resonant tunneling

1994 ◽  
Vol 50 (24) ◽  
pp. 18288-18298 ◽  
Author(s):  
H. T. Imam ◽  
V. V. Ponomarenko ◽  
D. V. Averin
Keyword(s):  
Coulomb Blockade ◽  
Resonant Tunneling

PHOTON-ASSISTED TRANSPORT CHARACTERISTICS THROUGH QUANTUM DOT COUPLED TO SUPERCONDUCTING RESERVOIRS

NANO ◽  
2006 ◽  
Vol 01 (03) ◽  
pp. 259-264 ◽  
Author(s):  
A. S. ATALLAH ◽  
A. H. PHILLIPS ◽  
A. F. AMIN ◽  
M. A. SEMARY
Keyword(s):  
Magnetic Field ◽  
Numerical Calculation ◽  
Quantum Dot ◽  
Resonant Tunneling ◽  
Andreev Reflection ◽  
Point Contact ◽  
Quantum Point Contact ◽  
Time Varying ◽  
Quantum Point ◽  
Tunneling Behavior

The influence of time-varying fields on the transport through a mesoscopic device has been investigated. This mesoscopic device is modeled as a quantum dot coupled to superconducting reservoirs via quantum point contact. The effect of a magnetic field and the Andreev reflection process were taken into account. The conductance was deduced by using Landuaer–Buttiker equation. A numerical calculation has been performed that shows a resonant tunneling behavior. Such investigation is important for fabricating photoelectron mesoscopic devices.

Low Voltage Nonlinear Conductance of Gold Nanowires: Room Temperature Coulomb Blockade Effect?

1998 ◽  
pp. 1-10 ◽  
Author(s):  
J. L. Costa-Krämer ◽  
N. Garcia ◽  
M. Jonson ◽  
I. V. Krive ◽  
H. Olin ◽  
...  
Keyword(s):  
Coulomb Blockade ◽  
Room Temperature ◽  
Low Voltage ◽  
Gold Nanowires ◽  
Nonlinear Conductance

Environmental Effects on the Single Molecule Conductance of bis(thiahexyl)oligothiophenes

2009 ◽  
Vol 1154 ◽  
Author(s):  
Edmund Leary ◽  
Horst Höbenreich ◽  
Simon J. Higgins ◽  
Harm van Zalinge ◽  
Wolfgang Haiss ◽  
...  
Keyword(s):  
Electron Transport ◽  
Single Molecule ◽  
Environmental Effects ◽  
Electronic Devices ◽  
Molecular Wires ◽  
Water Molecules ◽  
Ambient Water ◽  
Molecular Electronic ◽  
Molecular Conductance ◽  
Non Equilibrium Green’S Function

AbstractSimple alkanedithiols exhibit the same molecular conductance whether measured in air, under vacuum or under liquids of different polarity. Here, we show that the presence of water ‘gates’ the conductance of a family of oligothiophene–containing molecular wires, and that the longer the oligothiophene, the larger is the effect; for the longest example studied, the molecular conductance is over two orders of magnitude larger in the presence of water, an unprecedented result suggesting that ambient water is a crucial factor to be taken into account when measuring single molecule conductances (SMC), or in the design of future molecular electronic devices. Theoretical investigation of electron transport through the molecules, using the ab initio non-equilibrium Green's function (SMEAGOL) method, shows that water molecules interact with the thiophene rings, shifting the transport resonances enough to increase greatly the SMC of the longer, more conjugated examples.

Molecular Memory Based on Nanowire–Molecular Wire Heterostructures

2007 ◽  
Vol 7 (1) ◽  
pp. 138-150 ◽  
Author(s):  
Chao Li ◽  
Bo Lei ◽  
Wendy Fan ◽  
Daihua Zhang ◽  
M. Meyyappan ◽  
...  
Keyword(s):  
Building Blocks ◽  
Molecular Wires ◽  
Charge Storage ◽  
Memory Devices ◽  
Molecular Wire ◽  
Molecular Memory ◽  
Nanoscale Device ◽  
Self Assembled ◽  
Novel Concept ◽  
Beyond Cmos

This article reviews the recent research of molecular memory based on self-assembled nanowire–molecular wire heterostructures. These devices exploit a novel concept of using redox-active molecules as charge storage flash nodes for nanowire transistors, and thus boast many advantages such as room-temperature processing and nanoscale device area. Various key elements of this technology will be reviewed, including the synthesis of the nanowires and molecular wires, and fabrication and characterization of the molecular memory devices. In particular, multilevel memory has been demonstrated using In2O3 nanowires with self-assembled Fe-bis(terpyridine) molecules, which serve to multiple the charge storage density without increasing the device size. Furthermore, in-depth studies on memory devices made with different molecules or with different functionalization techniques will be reviewed and analyzed. These devices represent a conceptual breakthrough in molecular memory and may work as building blocks for future beyond-CMOS nanoelectronic circuits.

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