RESCHEDULED: Public defence in Engineering Physics, M.Sc. Pedro de Castro Portugal
Public defence from the Aalto University School of Science, Department of Applied Physics.
Title of the thesis: Dynamic heat transport in open quantum systems
Doctoral student: Pedro de Castro Portugal
Opponent: Professor Liliana Arrachea, Universidad Nacional de San Martín, Argentina
Custos: Associate Professor Christian Flindt, Aalto University School of Science, Department of Applied Physics
Understanding how heat moves at the quantum level is crucial for the advancement of quantum technologies such as quantum computers and quantum thermometers. At the nanoscale, heat transport does not always follow classical rules; quantum effects can lead to unique behaviors that impact the functionality of devices.
In this thesis, the effects of time-dependent temperature variations on heat transport are explored. Traditionally, research often considers temperature gradients that are static or change very slowly.
This research expands theoretical models by introducing time-dependent temperatures directly into the mathematical descriptions (Hamiltonians) of quantum systems. Building upon Luttinger's formalism—which originally incorporated static temperature gradients using a "gravitational" potential in electronic systems—this thesis generalizes the approach to other situations. By doing so, it aims to provide a better understanding of how quantum systems respond to rapid temperature changes.
Key findings include the development of a Floquet scattering theory for dynamic Luttinger potentials in non-interacting electronic systems, with applications in electron quantum optics. Additionally, the research characterizes the spin-boson model as a thermotronic device. Furthermore, the study models finite effective environments with time-dependent temperatures and introduces techniques for calculating photon emission statistics using Gaussian states.
In summary, this thesis offers new perspectives on dynamic heat transport in open quantum systems, extending existing theoretical frameworks.
Key words: Quantum transport, Heat current, Electron quantum optics, Spin-Boson model, Open quantum systems
Thesis available for public display 10 days prior to the defence at: https://aaltodoc.aalto.fi/doc_public/eonly/riiputus/
Yhteystiedot:
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Doctoral theses at the School of Science: https://aaltodoc.aalto.fi/handle/123456789/52
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