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postgraduate thesis: Application of hierarchical equations of motion to time dependent quantum transport

TitleApplication of hierarchical equations of motion to time dependent quantum transport
Authors
Issue Date2012
PublisherThe University of Hong Kong (Pokfulam, Hong Kong)
Citation
Tian, H. [田恒]. (2012). Application of hierarchical equations of motion to time dependent quantum transport. (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. Retrieved from http://dx.doi.org/10.5353/th_b4786944
AbstractWithin 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.
DegreeDoctor of Philosophy
SubjectNanostructures.
Transport theory.
Dept/ProgramChemistry
Persistent Identifierhttp://hdl.handle.net/10722/183325

 

DC FieldValueLanguage
dc.contributor.authorTian, Heng-
dc.contributor.author田恒-
dc.date.accessioned2013-05-26T06:54:02Z-
dc.date.available2013-05-26T06:54:02Z-
dc.date.issued2012-
dc.identifier.citationTian, H. [田恒]. (2012). Application of hierarchical equations of motion to time dependent quantum transport. (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. Retrieved from http://dx.doi.org/10.5353/th_b4786944-
dc.identifier.urihttp://hdl.handle.net/10722/183325-
dc.description.abstractWithin 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.-
dc.languageeng-
dc.publisherThe University of Hong Kong (Pokfulam, Hong Kong)-
dc.relation.ispartofHKU Theses Online (HKUTO)-
dc.rightsThe author retains all proprietary rights, (such as patent rights) and the right to use in future works.-
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.source.urihttp://hub.hku.hk/bib/B47869446-
dc.subject.lcshNanostructures.-
dc.subject.lcshTransport theory.-
dc.titleApplication of hierarchical equations of motion to time dependent quantum transport-
dc.typePG_Thesis-
dc.identifier.hkulb4786944-
dc.description.thesisnameDoctor of Philosophy-
dc.description.thesislevelDoctoral-
dc.description.thesisdisciplineChemistry-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.5353/th_b4786944-
dc.date.hkucongregation2012-

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