Cqt-datta-l1-slides - nanoHUB.org online simulations and more CQT Lecture#1 Unified Model for Quantum Transport Far from Equilibrium Nanodevices

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nano HUB .org Supriyo Datta 1 online simulations and more Network for Computational Nanotechnology H Σ 1 Σ 2 μ 1 2 Σ s CQT Lecture #1 Unified Model for Quantum Transport Far from Equilibrium CQT, Lecture#1: Nanodevices and Maxwell’s Demon Objective: To illustrate the subtle interplay of dynamics and thermodynamics that distinguishes transport physics. Reference: S.Datta,"Nanodevices and Maxwell's demon", to appear in the Proceedings of the Third ASI International Workshop on Nano Science & Technology, Ed. Z.K.Tang, Taylor & Francis (2007). http://arxiv.org/abs/0704.1623 “QTAT” Datta, Quantum Transport: Atom to Transistor, Cambridge (2005)
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nano HUB .org Supriyo Datta 2 online simulations and more Network for Computational Nanotechnology Maxwell’s demon Channel Source Drain V I <---- L ----> Electronic demon ---- V = 0
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nano HUB .org Supriyo Datta 3 online simulations and more Network for Computational Nanotechnology Top-down view CHANNEL V = I R or I = V G Conductance, G = 1/R L A G / σ = Conductivity m n q / 2 τ = ? = “Very complicated” m = ? n = ? I V Channel Drain <---- L ----> Source
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nano HUB .org Supriyo Datta 4 online simulations and more Network for Computational Nanotechnology Bottom-up View Ohm’s law L A G GV I / , σ = = CHANNEL ± ² ³ Ω = K h q G 8 . 25 / 1 2 ) / ( rate escape γ “Bottom” “Top” Bottom-Up View Channel Source Drain I V <---- L ----> ) ( ) / ( 2 γπ D h q G = Density of states Escape rate
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nano HUB .org Supriyo Datta 5 online simulations and more Network for Computational Nanotechnology S Channel D V Equilibrium Energy Level Diagram Vacuum Level Electrochemical Potential μ S Channel D V G > 0 V G < 0 No states F I L E D M P T Y Insulator V G “Gate”
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This note was uploaded on 12/30/2010 for the course EE 495 taught by Professor S.datta during the Spring '10 term at Indiana University-Purdue University Fort Wayne.

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Cqt-datta-l1-slides - nanoHUB.org online simulations and more CQT Lecture#1 Unified Model for Quantum Transport Far from Equilibrium Nanodevices

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