Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 45: Nano- and Optomechanics

TT 45.5: Vortrag

Dienstag, 13. März 2018, 12:45–13:00, H 0110

Multistability in vibrational lasing of a nanomechanical resonator — •Mattia Mantovani¹, Andrew Armour², Wolfgang Belzig¹, and Gianluca Rastelli¹ — ¹Fachbereich Physik, Universität Konstanz, D-78457 Konstanz, Germany — ²School of Physics and Astronomy, University of Nottingham, Nottingham, NG7 2RD, United Kingdom

We study the nonequilibrium dynamics of a nanomechanical resonator, realized by a suspended carbon nanotube in contact with two ferromagnetic leads. The nanotube hosts a quantum dot with two spin levels, which are coupled to the vibrational flexural modes via spin-vibration interaction [1-3]. We show that the system encodes a single-atom laser [4] in which the mechanical vibration plays the role of the cavity with frequency equal to the Zeeman splitting of the two levels. The lasing state can be achieved in the experimental range of the parameters for the spin-vibration coupling strength and magnetic polarization of the leads. Moreover, such a system has unique features which distinguish it from the single-atom model. In particular, we find regions with multistability of the resonator that are reflected in the zero-frequency current noise through the quantum dot.
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