# Dresden 2017 – wissenschaftliches Programm

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# TT: Fachverband Tiefe Temperaturen

## TT 46: Focus Session: Collective Quantum Dynamics: From Fundamentals to New Phenomena

### TT 46.3: Hauptvortrag

### Mittwoch, 22. März 2017, 16:00–16:30, HSZ 03

**Floquet Engineering and Control of Topology in Solid State Systems** — •Takashi Oka^{1,2}, Leda Bucciantini^{1,2}, Sthitadhi Roy^{2}, and Sota Kitamura^{3} — ^{1}Max Planck institute for the Physics of Complex Systems, Dresden, Germany — ^{2}Max Planck institute for Chemical Physics of Solids, Dresden, Germany — ^{3}The university of Tokyo, Department of Tokyo, Tokyo, Japan

Periodically driven quantum system is attacting interest as a way to create new state of matter with exotic topological and dynamical properties.

1. Emergent Weyl points and Fermis arcs in a Floquet Weyl semimetal [1]: We find that a series of infinite numbers of Weyl points emerges, moves and annihilates in a Floquet Weyl semimetal that can be realized by applying circularly polarized laser to a three dimensional Dirac mateiral.

2. Landau quantization in an oscillating magnetic field [2]: We find that Landau quantization is not restricted to a static magnetic field but can be realized in oscillating fields and find a state that is analogous to the integer quantum Hall effect (QHE) when the ratio between the cyclotron frequency and the laser frequency is given by magic numbers.

[1] L. Bucciantini, S. Roy, S. Kitamura, and T. Oka, in prep.

[2] T. Oka, and L. Bucciantini, Phys. Rev. B 94, 155133 (2016)