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ECE Seminar

Quantum realism to semiconductor nanoscience

Mackillo KiraAssociate Professor Department of Physics, University of Marburg

Nanoscience will advance to true device engineering only when both new quantum processes and realistic quantum-theory insights are added to the design repertoire. Since quantum processes are driven by many-body interactions, nearly all design models are still insufficient as they crudely approximate many-body effects. In this seminar, I will show how to apply a first-principles many-body theory[1] to realistically describe interactions among particle clusters driving diverse quantum processes. Using this framework, I will introduce quantum-optical spectroscopy[2] which utilizes quantum fluctuations of light to select a desired quantum process among multiple excitation paths. I will illustrate this idea through the experimental discovery of a dropleton[3]. Applying the cluster identification for excitations with few-cycle terahertz pulses, I will explain how ultrafast experiments can access delicate quantum processes in semiconductors, such as high-harmonic generation, dynamical Bloch oscillations[4], electronic quantum interferences[5], nonlinear Coulomb effects among Landau electrons[6], and pure correlation transport[7] across a semiconductor interface. I will also demonstrate how the approach quantitatively explains[8] the first Bose"“Einstein condensate experiment[9] with the strongest possible atom"“atom interactions. In short, my approach provides both a systematic and realistic description for a broad range of systems explored in material- and nanoscience.

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