Wigner Monte Carlo Method for Nanoelectronic Devices

A Particle Description of Quantum Transport and Decoherence

Inbunden, Engelska, 2010

2 449 kr

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The emergence of nanoelectronics has led us to renew the concepts of transport theory used in semiconductor device physics and the engineering community. It has become crucial to question the traditional semi-classical view of charge carrier transport and to adequately take into account the wave-like nature of electrons by considering not only their coherent evolution but also the out-of-equilibrium states and the scattering effects. This book gives an overview of the quantum transport approaches for nanodevices and focuses on the Wigner formalism. It details the implementation of a particle-based Monte Carlo solution of the Wigner transport equation and how the technique is applied to typical devices exhibiting quantum phenomena, such as the resonant tunnelling diode, the ultra-short silicon MOSFET and the carbon nanotube transistor. In the final part, decoherence theory is used to explain the emergence of the semi-classical transport in nanodevices.

Produktinformation

Utgivningsdatum2010-04-13
Mått163 x 241 x 20 mm
Vikt540 g
FormatInbunden
SpråkEngelska
Antal sidor256
FörlagISTE Ltd and John Wiley & Sons Inc
ISBN9781848211506

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Symbols ixAbbreviations xiiiIntroduction xvAcknowledgements xxiChapter 1. Theoretical Framework of Quantum Transport in Semiconductors and Devices 11.1. The fundamentals: a brief introduction to phonons, quasi-electrons and envelope functions 21.2. The semi-classical approach of transport 111.3. The quantum treatment of envelope functions 161.4. The two main problems of quantum transport 29Chapter 2. Particle-based Monte Carlo Approach to Wigner-Boltzmann Device Simulation 572.1. The particle Monte Carlo technique to solve the BTE 592.2. Extension of the particle Monte Carlo technique to the WBTE: principles 712.3. Simple validations via two typical cases 832.4. Conclusion 86Chapter 3. Application of the Wigner Monte Carlo Method to RTD, MOSFET and CNTFET 893.1. The resonant tunneling diode (RTD) 903.2. The double-gate metal-oxide-semiconductor field-effect transistor (DG-MOSFET) 993.3. The carbon nanotube field-effect transistor (CNTFET) 1343.4. Conclusion 148Chapter 4. Decoherence and Transition from Quantum to Semi-classical Transport 1514.1. Simple illustration of the decoherence mechanism 1524.2. Coherence and decoherence of Gaussian wave packets in GaAs 1574.3. Coherence and decoherence in RTD: transition between semi-classical and quantum regions 1714.4. Quantum coherence and decoherence in DG-MOSFET 1754.5. Conclusion 180Conclusion 183Appendix A. Average Value of Operators in the Wigner Formalism 187Appendix B. Boundaries of the Wigner Potential 189Appendix C. Hartree Wave Function 191Appendix D. Asymmetry Between Phonon Absorption and Emission Rates 193Appendix E. Quantum Brownian Motion 195Appendix F. Purity in the Wigner formalism 201Appendix G. Propagation of a Free Wave Packet Subject to Quantum Brownian Motion 203Appendix H. Coherence Length at Thermal Equilibrium 205Bibliography 207Index 241