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• W1585119256 abstract "The important progress made in nanolitography processes in the last decades has hada profound impact in our daily lives, by making possible the miniaturization of consumerelectronics. Unbeknownst to most consumers, it is nowadays possible to fabricatefree-standing nanoscale devices, that will naturally vibrate under thermal orexternal excitation. Over the last decade, a new subfield of physics devoted to studyingthese objects emerged: nanomechanics.In this thesis, we study electronic transport in such nanostructures where mechanicaldegrees of freedom play an important role. More precisely, we calculate the fulltransport properties (e.g. average current, frequency-dependent current noise) of differentmesoscopic detectors in the presence of coupling to a nanomechanical oscillator.The objective of our study is twofold. First, there is a strong interest in understandingthe effect that the coupling to electronic degrees of freedom has on the stateof the mechanical system. We will show that under many conditions the interactionwith the detector can be understood in terms of an effective thermal bath, but alsodiscuss the limitations of this effective environment model. A second main aspect ofthe work presented here is the calculation of the signature of the mechanical objectin the transport properties of the detector. As one of the primary goal in the fieldof nanoelectromechanical systems is to use the output of such electrical detectors toachieve position measurements at the quantum limit, this question obviously is ofgreat relevance to the field.This thesis is organized in 3 main parts, each associated with a different electronicdetector. After a short introduction to nanoelectromechanical systems, we focus inPart II on a system composed a single-electron transistor coupled capacitively to aclassical mechanical oscillator. We present a complete study of the transport propertiesof the coupled system, going beyond the usual weak-coupling approximation.In Part III, we discuss the properties of a system where a tunnel junction is coupledto the mechanical object. Looking at this system from the point of view of quantummeasurement, we analyze the transport properties of a system composed of two independenttunnel junctions coupled to the same oscillator and demonstrate how, byusing the cross correlated output of the two detectors, one can improve the sensitivityof position measurements beyond the usual quantum limit. In this part, we alsodemonstrate that the current noise of a system composed of two tunnel junctions (onewith fixed transmission amplitude, the other with position-dependent transmissionamplitude) can contain information about the momentum of the mechanical oscillator.Lastly, in Part IV we study a system composed of a mechanical oscillator coupledto a superconducting single-electron transistor. The coupled dynamics of the oscillatorand mesoscopic detector are in this case very complex, and we demonstrate howa numerical approach based on a solution of the Liouville equation can be used tovalidate results obtained from approximate analytical approaches. We also demonstrate,by looking at the frequency-dependence of the charge fluctuations on the superconductingsingle-electron transistor, limitations to the model where the effect ofthe detector back-action on the oscillator is modeled as an effective environment." @default.
• W1585119256 created "2016-06-24" @default.
• W1585119256 creator A5039184110 @default.
• W1585119256 date "2009-01-01" @default.
• W1585119256 modified "2023-09-26" @default.
• W1585119256 title "Electronic transport in nanoelectromechanical systems : noise, back-action, and quantum measurement" @default.
• W1585119256 doi "https://doi.org/10.5451/unibas-004780682" @default.
• W1585119256 hasPublicationYear "2009" @default.
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