Rostock 2019 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 20: Quantum Information (Solid State Systems)
Q 20.3: Vortrag
Montag, 11. März 2019, 17:00–17:15, S HS 002 Chemie
Interaction of electron spins with mechanical modes of two-dimensional semiconductors — •Lukas Pausch1,2, Alexander Pearce2, and Guido Burkard2 — 1Institute of Physics, Albert-Ludwigs-Universität Freiburg, D-79085 Freiburg, Germany — 2Department of Physics, University of Konstanz, D-78457 Konstanz, Germany
Mechanical resonators made out of Transition Metal Dichalcogenide (TMDC) Monolayers show interesting mechanical and electronic properties such as a large Q factor [1-2], a sizeable direct band gap and a spin-split conduction band [3]. Strain and curvature have been proven to influence the band structure of TMDC monolayers [4]. In this theoretical study, we investigate the interplay between mechanical motion and electronic band structure of a TMDC monolayer. We use classical continuum mechanics to obtain equations of motion for the vibration of circular TMDC resonators and to solve these equations for the fundamental mode. By considering this solution within a general approach to strained and curved TMDC monolayers [4], we derive a model for the electromechanical coupling in the device and construct a low energy effective model of the conduction band electronic states and mechanical degrees of freedom. Finally, we consider the spin- and valley-dependent transport across the mechanical resonator device.
[1] A. Castellanos-Gomez et al., Adv. Mater. 25, 6719 (2013).
[2] N. Morell et al., Nano Lett. 16, 5102 (2016).
[3] Q. H. Wang et al., Nat. Nanotechnol. 7, 699 (2012).
[4] A. J. Pearce et al., Phys. Rev. B 94, 155416 (2016).