From Phonon- Backaction and -Interference in Quantum Dot Circuits to the Single Phonon Detector

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• Dr Stefan Ludwig LMU Munich
• Tuesday 05 November 2013, 14:15-15:15
• Microelectronics Research Centre (MRC) Seminar Room, Cavendish Laboratory, Department of Physics.

If you have a question about this talk, please contact Emily Heavens.

Electron-phonon interaction is often neglected in nanoelectronics, even though the nanostructures are usually embedded in solids with sizable electron-phonon coupling tensors. In this talk I will present a sequence of experiments in GaAs-based heterostructures which demonstrate possible ways of how phonons affect the functionality of nanoelectronic devices. My special focus will be on phonon-mediated interaction effects in quantum dot based qubits including detector backaction and interference in phonon absorption. Finally, I will demonstrate the capability of coupled quantum dot systems as single phonon detectors.

related publications: [1] Nature Phys. 8, 522 (2012) [2] Phys. Rev. Lett. 104, 196801 (2010) [3] Phys. Rev. Lett. 102, 186801 (2009) [4] Phys. Rev. Lett. 99, 096803 (2007) [5] Phys. Rev. Lett. 97, 176803 (2006)

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• Microelectronics Research Centre (MRC) Seminar Room, Cavendish Laboratory, Department of Physics

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