Dresden 2017 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 58: Focus Session on 2D Materials: Ballistic Quantum Transport in Graphene (jointly with DY, DS, HL, MA, O)
TT 58.7: Vortrag
Donnerstag, 23. März 2017, 12:30–12:45, HSZ 03
Quantum time mirrors in two-band systems with and without broken time-reversal symmetry — •Phillipp Reck1, Cosimo Gorini1, Arseni Goussev2, Viktor Krueckl1, Mathias Fink3, and Klaus Richter1 — 1Institut für Theoretische Physik, Universität Regensburg — 2Department of Mathematics, Physics and Electrical Engineering, Northumbria University, Newcastle Upon Tyne, UK — 3Institut Langevin, ESPCI, CNRS, PSL Research University, Paris
Both metaphysical and practical considerations intrigued generations of scientists to devise and implement time-inversion protocols – in particular the Hahn echo [1], different forms of “time mirrors” for classical waves (see e.g. [2]), and recently an instantaneous time mirror for water waves [3]. With our proposal for an instantaneous Quantum Time Mirror [4], we showed the possibility to extend the family of time reversal protocols to continuous quantum systems, more precisely to wave packets in Dirac-cone systems, by changing the propagation direction with a short, time-dependent pulse.
In this talk, we discuss the effect on the Quantum Time Mirror of both, a static, out-of-plane magnetic field, which breaks time-reversal symmetry, and band structures other than the Dirac cone, e.g. the valence and conduction bands in direct gap semi-conductors.
[1] E. L. Hahn, Spin echoes. Phys. Rev.. 80, 580 (1950)
[2]M. Fink, IEEE Trans. Ultrason. Ferroelectr. Freq. Control, 39, 555, (1992)
[3]V. Bacot, et al., Nat. Phys. 12, 972–977 (2016)
[4]P. Reck, et al., arXiv:1603.07503 (2016)