
ECE 495N Lecture 8: Shrödinger's Equation
30 Sep 2008   Contributor(s):: Supriyo Datta

Quantum and Thermal Effects in Nanoscale Devices
18 Sep 2008   Contributor(s):: Dragica Vasileska
To investigate lattice heating within a Monte Carlo device simulation framework, we simultaneously solve the Boltzmann transport equation for the electrons, the 2D Poisson equation to get the selfconsistent fields and the hydrodynamic equations for acoustic and optical phonons. The phonon...

ECE 495N Lecture 7: Quantum Capacitance/Shrödinger's Equation
17 Sep 2008   Contributor(s):: Supriyo Datta

Lecture 6: Quantum Transport in Nanoscale FETs
12 Sep 2008   Contributor(s):: Mark Lundstrom
The previous lessons developed an analytical (or almost analytical) theory of the nanoscale FET, but to properly treat all the details, rigorous computer simulations are necessary. This lecture presents quantum transport simulations that display the internal physics of nanoscale MOSFETs. We use...

Lecture 4A: Energy Exchange and Maxwell's Demon
02 Sep 2008   Contributor(s):: Supriyo Datta
Objective: To incorporate distributed energy exchange processes into the previous models from lectures 1 through 3 which are based on a "Landauerlike picture" where the Joule heating associated with current flow occurs entirely in the two contacts.Although there is experimental evidence that...

Introduction: Nanoelectronics and the meaning of resistance
20 Aug 2008   Contributor(s):: Supriyo Datta
This lecture provides a brief overview of the fiveday short course whose purpose is to introduce a unified viewpoint for a wide variety of nanoscale electronic devices of great interest for all kinds of applications including switching, energy conversion and sensing. Our objective, however, is...

Lecture 1A: What and where is the resistance?
20 Aug 2008   Contributor(s):: Supriyo Datta
Objective: To introduce a simple quantitative model that highlights the essential parameters that determine electrical conduction: the density of states in the channel, D and the rates at which electrons hop in and out of the two contacts, labeled source and drain. This model is used to explain...

Lecture 1B: What and where is the resistance?
20 Aug 2008   Contributor(s):: Supriyo Datta
Objective: To introduce a simple quantitative model that highlights the essential parameters that determine electrical conduction: the density of states in the channel, D and the rates at which electrons hop in and out of the two contacts, labeled source and drain. This model is used to explain...

Lecture 2A: Quantum Transport
20 Aug 2008   Contributor(s):: Supriyo Datta
Objective: To extend the simple model from Lectures 1 into the fullfledged Nonequilibrium Green’s Function (NEGF) – Landauer model by introducing a spatial grid of N points and turning numbers like into (NxN) matrices like , with incoherent scattering introduced through . This model will be...

Lecture 2B: Quantum Transport
20 Aug 2008   Contributor(s):: Supriyo Datta
Objective: To extend the simple model from Lectures 1 into the fullfledged Nonequilibrium Green’s Function (NEGF) – Landauer model by introducing a spatial grid of N points and turning numbers like into (NxN) matrices like , with incoherent scattering introduced through . This model will be...

Lecture 3A: Spin Transport
20 Aug 2008   Contributor(s):: Supriyo Datta
Objective: To extend the model from Lectures 1 and 2 to include electron spin. Every electron is an elementary “magnet” with two states having opposite magnetic moments. Usually this has no major effect on device operation except to increase the conductance by a factor of two.But it is now...

Lecture 3B: Spin Transport
20 Aug 2008   Contributor(s):: Supriyo Datta
Objective: To extend the model from Lectures 1 and 2 to include electron spin. Every electron is an elementary “magnet” with two states having opposite magnetic moments. Usually this has no major effect on device operation except to increase the conductance by a factor of two.But it is now...

Lecture 4B: Energy Exchange and Maxwell’s Demon
20 Aug 2008   Contributor(s):: Supriyo Datta
Objective: To incorporate distributed energy exchange processes into the previous models from lectures 1 through 3 which are based on a “Landauerlike picture” where the Joule heating associated with current flow occurs entirely in the two contacts.Although there is experimental evidence that...

Lecture 5A: Correlations and Entanglement
20 Aug 2008   Contributor(s):: Supriyo Datta
Objective: To relate the oneelectron picture used throughout these lectures to the more general but less tractable manyparticle picture that underlies it. We introduce this new viewpoint using the example of Coulomb blockaded electronic devices that are difficult to model within the picture...

Lecture 5B: Correlations and Entanglement
20 Aug 2008   Contributor(s):: Supriyo Datta
Objective: To relate the oneelectron picture used throughout these lectures to the more general but less tractable manyparticle picture that underlies it. We introduce this new viewpoint using the example of Coulomb blockaded electronic devices that are difficult to model within the picture...

Nano Carbon: From ballistic transistors to atomic drumheads
14 May 2008   Contributor(s):: Paul L. McEuen
Carbon takes many forms, from precious diamonds to lowly graphite. Surprisingly, it is the latter that is the most prized by nano physicists. Graphene, a single layer of graphite, can serve as an impenetrable membrane a single atom thick. Rolled up into a nanometerdiameter cylindera carbon...

Nanoelectronic Modeling: Multimillion Atom Simulations, Transport, and HPC Scaling to 23,000 Processors
07 Mar 2008   Contributor(s):: Gerhard Klimeck
Future field effect transistors will be on the same length scales as “esoteric” devices such as quantum dots, nanowires, ultrascaled quantum wells, and resonant tunneling diodes. In those structures the behavior of carriers and their interaction with their environment need to be fundamentally...

MCW07 A Quantum Open Systems Approach to MolecularScale Devices
25 Feb 2008   Contributor(s):: Yongqiang Xue
Experimental advances in electrically and optically probing individual molecules have provided new insights into the behavior of single quantum objects and their interaction with the nanoenvironments without requiring ensemble average. Molecularscale devices are open quantum systems whose...

MCW07 Physics of Contact Induced Current Asymmetry in Transport Through Molecules
25 Feb 2008   Contributor(s):: Bhaskaran Muralidharan, owen miller, Neeti Kapur, Avik Ghosh, Supriyo Datta
We first outline the qualitatively different physics involved in the charginginduced current asymmetries in molecular conductors operating in the strongly coupled (weakly interacting) selfconsistent field (SCF) and the weakly coupled (strongly interacting) Coulomb Blockade (CB) regimes. The CB...

Exploring Physical and Chemical control of molecular conductance: A computational study
31 Jan 2008   Contributor(s):: Barry D. Dunietz