Nonlinearities and quantum phenomena in nanoelectromechanical systems

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.advisor Heikkilä, Tero, Prof., Aalto University, O.V. Lounasmaa laboratory, Finland
dc.contributor.author Khan, Raphaël
dc.date.accessioned 2015-10-07T09:02:10Z
dc.date.available 2015-10-07T09:02:10Z
dc.date.issued 2015
dc.identifier.isbn 978-952-60-6402-4 (electronic)
dc.identifier.isbn 978-952-60-6401-7 (printed)
dc.identifier.issn 1799-4942 (electronic)
dc.identifier.issn 1799-4934 (printed)
dc.identifier.issn 1799-4934 (ISSN-L)
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/17971
dc.description.abstract This dissertation addresses different types of nonlinear phenomena in nanoelectromechanical systems (NEMS) with an aim to find quantum behavior in them. Quantum mechanics is a theory that describes physics at the atomic scale. Without it many phenomena such as the electronic properties of crystalline matter would not be properly understood. However, the way the world works on quantum scale is nothing like how it appears in the classical perception of human beings. Although all the objects around us are made of atoms, none of the objects show quantum behavior since perturbations coming from their surroundings destroy the quantum states. During the last decade, NEMS have caught the interest of the scientific community since they are promising candidates to study and test quantum mechanics in the macroscopic scale.  In recent experiments, optomechanical systems have been used to cool nanomechanical resonators to their ground state. Ground state cooling is a requirement for the observation of the quantum nature of the mechanical resonator. But in addition to being close to the ground state, nonlinearities are needed to distinguish the quantum behavior from the classical one. Therefore, great effort is spent studying nonlinearities either within the mechanical resonator or due to an external system coupled to the nanomechanical resonator.  This dissertation is composed of an introduction and four research articles published in high-level physics journals. The introduction starts by discussing the basic theory of  NEMS. Then it specifies some relevant nonlinearities that occur in nanoelectromechanical systems, and how one can use them for the observation of quantum phenomena on macroscopic scale. The details of such nonlinearities are described in the research articles presented in the thesis. en
dc.format.extent 62 + app. 38
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher Aalto University en
dc.publisher Aalto-yliopisto fi
dc.relation.ispartofseries Aalto University publication series DOCTORAL DISSERTATIONS en
dc.relation.ispartofseries 145/2015
dc.relation.haspart [Publication 1]: Mika A. Sillanpää, Raphaël Khan, Tero T. Heikkilä, and Pertti J. Hakonen. Macroscopic quantum tunneling in nanoelectromechanical systems. Physical Review B, 84, 195433, November 2011. DOI: 10.1103/PhysRevB.84.195433
dc.relation.haspart [Publication 2]: Raphaël Khan, F. Massel, and T. T. Heikkilä. Tension-induced nonlinearities of flexural modes in nanomechanical resonators. Physical Review B, 87, 235406, June 2013. DOI: 10.1103/PhysRevB.87.235406
dc.relation.haspart [Publication 3]: T. T. Heikkilä, F. Massel, J. Tuorila, R. Khan and M. A. Sillanpää. Enhancing Optomechanical Coupling via the Josephson Effect. Physical Review Letters, 112, 203603, May 2014. DOI: 10.1103/PhysRevLett.112.203603
dc.relation.haspart [Publication 4]: R. Khan F. Massel, T. T. Heikkilä. Cross-Kerr nonlinearity in optomechanical systems. Physical Review A, 91, 043822, April 2015. DOI: 10.1103/PhysRevA.91.043822
dc.subject.other Physics en
dc.title Nonlinearities and quantum phenomena in nanoelectromechanical systems en
dc.type G5 Artikkeliväitöskirja fi
dc.contributor.school Perustieteiden korkeakoulu fi
dc.contributor.school School of Science en
dc.contributor.department Teknillisen fysiikan laitos fi
dc.contributor.department Department of Applied Physics en
dc.subject.keyword NEMS en
dc.subject.keyword nonlinearities en
dc.subject.keyword quantum mechanics en
dc.identifier.urn URN:ISBN:978-952-60-6402-4
dc.type.dcmitype text en
dc.type.ontasot Doctoral dissertation (article-based) en
dc.type.ontasot Väitöskirja (artikkeli) fi
dc.contributor.supervisor Hakonen, Pertti, Prof., Aalto University, O. V. Lounasmaa Laboratory, Finland
dc.opn Jonson, Mats, Prof., Chalmers University of Technology, Sweden
dc.contributor.lab O. V. Lounasmaa Laboratory en
dc.rev Vitali, David, Prof., University of Camerino, Italy
dc.rev Isacsson, Andreas, Assoc. Prof., Chalmers University of Technology, Sweden
dc.date.defence 2015-10-16


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