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Application of Hierarchical Equations of Motion to Time Dependent Quantum Transport

Application of Hierarchical Equations of Motion to Time Dependent Quantum Transport


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About the Book

This dissertation, "Application of Hierarchical Equations of Motion to Time Dependent Quantum Transport" by Heng, Tian, 田恒, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Within the exact framework established recently, which is a successful marriage between the time dependent density functional theory for open electronic system and quantum dissipation theory formulated in the hierarchical equations of motion, an entirely new scheme is proposed in this thesis to simulate the time-dependent quantum transport in nano-devices at both zero and finite temperature equally without relying on the pole structure of the Fermi distribution function. Neither does it depend on any non-unique parametrization of the line-width matrix, hence, this new practical approach can be integrated with the first principles simulations seamlessly. Beyond the exact framework, a reliable method which works under the Wide- Band-Limit approximation at zero temperature is also developed. At the price of loss of some non-Markovian memory effects on the dynamics, a set of equations of motion which terminates at the first tier instead of the second tier is obtained. Benefiting from the latest advancement of numerical analysis, a hybrid fourth-order Runge-Kutta algorithm is proposed to solve this set of equations of motion which comprises stiff ones. Based on this result, an alternative scheme is considered to deal with the same approximation at finite temperature. As an illustration of these new approaches, the transient current of the one dimensional tight-binding periodical chain with and without a single impurity, driven by some time alternating and/or static bias voltages, are investigated. The influence of temperature and switch-on rate of bias voltage is exemplified. Particularly, in the one dimensional tight-binding chain with a single impurity which breaks its perfect periodicity, an asymmetry between the left and right transient current is found. Comparison between the results under the Wide-Band-Limit approximation and those with the exact description is carried out. DOI: 10.5353/th_b4786944 Subjects: Nanostructures Transport theory


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Product Details
  • ISBN-13: 9781361313411
  • Publisher: Open Dissertation Press
  • Publisher Imprint: Open Dissertation Press
  • Height: 279 mm
  • No of Pages: 116
  • Weight: 562 gr
  • ISBN-10: 1361313412
  • Publisher Date: 26 Jan 2017
  • Binding: Hardback
  • Language: English
  • Spine Width: 8 mm
  • Width: 216 mm


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