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https://scholarbank.nus.edu.sg/handle/10635/37876
DC Field | Value | |
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dc.title | Steady-state transport properties of anharmonic systems | |
dc.contributor.author | THINGNA JUZAR YAHYA | |
dc.date.accessioned | 2013-05-31T18:01:56Z | |
dc.date.available | 2013-05-31T18:01:56Z | |
dc.date.issued | 2013-01-18 | |
dc.identifier.citation | THINGNA JUZAR YAHYA (2013-01-18). Steady-state transport properties of anharmonic systems. ScholarBank@NUS Repository. | |
dc.identifier.uri | http://scholarbank.nus.edu.sg/handle/10635/37876 | |
dc.description.abstract | In this thesis we first focus on the reduced density matrix of an anharmonic system weakly connected to multiple heat baths. We show that the steady-state perturbative master equations are correct only up to second order in system-bath coupling and propose a novel modified Redfield solution (MRS) to capture the second order steady state effects. Next, we study phononics and develop two <i>sui generis</i> formulations to deal with anharmonic molecular junctions. Firstly, a weak-coupling formulation to study steady state and transient currents is developed. Secondly, nonequilibrium Green?s function techniques are employed to overcome the weak system-bath coupling approximation. Several examples and validations are provided for the proposed theories. Lastly, we study spin transport in: magnetic insulators using the MRS to analyze effects of system size and magnetic field and; semiconductors using the semi-classical spin drift-diffusion equations, which are applied to study the influence of device geometries on the spin-injection ratio. | |
dc.language.iso | en | |
dc.subject | Quantum master equation, Modified Redfield solution, molecular junctions, phononics, spin drift-diffusion, spintronics | |
dc.type | Thesis | |
dc.contributor.department | PHYSICS | |
dc.contributor.supervisor | WANG JIAN-SHENG | |
dc.description.degree | Ph.D | |
dc.description.degreeconferred | DOCTOR OF PHILOSOPHY | |
dc.identifier.isiut | NOT_IN_WOS | |
Appears in Collections: | Ph.D Theses (Open) |
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