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Dissipative Quantum Transport in 3D Bo Fu Advisor: Prof. Eric Polizzi, Prof. Max Fischetti Abstract: In order to simulate nanowire, we extend our previous work to 3D. For the time being model order reduction is used to build the 3D FEM mesh, on which full 3D Schrodinger-Poisson is solved self consistently. |
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Dissipative Quantum Transport in 1D and 2D Bo Fu Advisor: Prof. Max Fischetti Abstract: On the way to develop a complete full-band quantum transport simulation using the Pauli Master Equation, we show our present results on 1D n-i-n resistors, 1D double barrier resonant tunneling diodes (DBRTD), and 2D double-gate field effect transistors (DGFETs) using a simplified parabolic, spherical effective-mass band-structure model accounting for nonpolar scattering with acoustic (elastic) and optical (inelastic) silicon-like phonons. We also consider the effect of point-like dopants on the access resistance of thin-body double gate devices. Puclications:
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Terahertz Detection on Bundles of Single Wall Carbon Nanotubes Bo Fu Advisor: Prof. K. Sigfrid Yngvesson Abstract: We report new results on experimental detection of microwaves and terahertz waves (up to 2.5 THz) in bundles of metallic carbon nanotubes. Our earlier microwave detection results have been improved and a microwave equivalent circuit is derived. The terahertz detection results agree with a bolometric model and are promising for operation substantially above 4.2 K. Publications:
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Bo Fu Advisor: Prof. Max Fischetti Abstract: Empirical pseudopotential method (EPM) is applied to calculate the band structure of fcc semiconductors. Curvature effective mass is obtained at extrema points. Constant energy surface is drawn before calculating the density of state. Finally band-gap deformation potential is approximated evaluated. Full report [PDF] |
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2D Schrodinger-Poisson Self-consistent Solver Bo Fu Advisor: Prof. Eric Polizzi Abstract: Planar transistors suffered from undesirable short channel effects will be replaced by non-planar transistors like FinFETs (UC Berkeley), Tri-gate (Intel), Pi/Omega gate and Gate-All-Around (GAA) structures. Among them, GAA FETs because of excellent electrostatic integrity draw increasingly interests of research. To minimize the computation cost, its characteristics can be studied by using a quasi-3D approach which involves 2D confinement and 1D transport. The 2D confinement is solved by Schrodinger-Poisson self-consistently and the 1D transport is solved either by Non-Equilibrium Greens Function (NEGF) or Boltzmann Transport Equation (BTE). In this project only self-consistently solving 2D Schrodinger-Poisson is considered. Full report [PDF] |
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Monte Carlo Simulation on Single Electron Transport Bo Fu Advisor: Prof. Max Fischetti Abstract: In this project, Monte Carlo method is used to simulate electron transport in silicon under constant and pseudo p-n junction field. A parabolic band with a single effective mass is applied. I choose the density of state (DOS) effective mass, notated by md. Scattering processes included are optical phonon absorbtion and emission, acoustic phonon scattering, and impurity scattering. Intervalley scattering and electron-electron interactions, etc. are not considered in this simple model. Brief theory is explained first, followed by the simulation results and discussion, a short conclusion is given at the end. Full report [PDF] |
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Bo Fu Advisor: Prof. Weibo Gong Abstract: By the Integral Hamilton’s Principle, Euler Lagrange’s Equation is applied in Classical Mechanics. The result turns out to be the Newton's Second Law of Motion and the law of momentum conservation, which reveals that the system moves in a way consuming the extreme energy. Quantum Mechanics theory then is built up from a mathematical perspective. Basic concepts and calculations are explained and demonstrated by the example of a particle in a one dimension potential well. After that, MOS inversion problem is set up and has been solved by applying optimal thinking instead of complicated and time-consuming numerical approach. At last, a generalized optimization method by using Euler Lagrange’s equation for any open system is proposed, but it is not valid until all necessary constraints are taken into consideration to restrict the degrees of freedom. Full report [PDF] |
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Probability and Statistics in Solid State Physics Bo Fu Advisor: Prof. Hossein Pishro-Nik Abstract: In this project I use classical probability theory to derive some important distributions in solid state physics, namely Fermi-Dirac distribution, Maxwell-Boltzmann distribution and Bose-Einstein distribution. After that, a comparison is shown from the mathematical perspective. Under certain circumstances (acceptable error %), Fermi-Dirac and Bose-Einstein could be alternated by Maxwell-Boltzmann distribution. Finally an application is given to demonstrate the importance of this approximation in solid state physics to simplify calculation. Full report [PDF] |
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Bo Fu Abstract: Chaotic behavior happens when the system comes to the period three. The pediodicity is highly depent on the initial conditions, which is also known as the butterfly effect. Using C, I visualize and vocalize the chaotic behavior. When initial value is (3, 1+sqrt(6)), the system is period two and (1+sqrt(6), 3.54) it is period four. Full report [PDF] /Demo audio [WAV] (initial value equals 3.8) |
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