Regensburg 2016 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 2: Graphene: Theory
(Joint session of DS, DY, HL, MA, O and TT organized by HL)
TT 2.1: Vortrag
Montag, 7. März 2016, 09:30–09:45, H17
Instantaneous Quantum Time Reversal Mirror in Graphene — •Phillipp Reck1, Cosimo Gorini1, Arseni Goussev2, Mathias Fink3, and Klaus Richter1 — 1Institut für Theoretische Physik, Universität Regensburg — 2Department of Mathematics and Information Sciences, Northumbria University, Newcastle Upon Tyne, UK — 3Ecole Supérieure de Physique et Chimie Industrielle, CNRS, PSL Research University, Paris, France
The physicists' fascination for time inversion goes back a long time, as testified by the famous 19th-century argument between Loschmidt and Boltzmann concerning the arrow of time. Both metaphysical and practical considerations intrigued generations of scientists, who have ever since strived to devise and implement time-inversion protocols -- in particular, different forms of ``time mirrors'' for classical waves such as sound- and electromagnetic-waves (see e.g. [1-2]), and recently an instantaneous time mirror for water waves [3].
Here we propose the realization of instantaneous Time Mirrors for quantum systems. These are controlled time discontinuities acting on wavefronts as mirrors in time and leading to distinct wavefunction echoes. More precisely, our Quantum Time Mirror exploits up to now unrelated concepts of wavefront time inversion and population reversal in two-level systems, the latter quintessential to spin echoes. It can be implemented in a relativistic Dirac-like system, e.g. graphene.
[1]M. Fink , IEEE Trans. Ultr. Ferroel. Freq. Control, 39, 555, (1992)
[2]G. Lerosey, et al., Phys. Rev. Lett. 92, 193904 (2004)
[3]V. Bacot, et al., preprint (2015)