SFB 767 Colloquium: Cavity-mediated electron interactions and Mott polaritons in quantum materials

Thursday, 27. June 2019
15:15 – 16:30

P 603

G. Burkard, 5256 / W. Belzig, 4782

Dr. Frank Schlawin, University of Oxford

Recent years have witnessed the development of a new generation of nanoplasmonic cavities, which can reach the ultrastrong coupling regime with cyclotron transitions in two-dimensional electron gases [1]. This has triggered considerable interest in the possibility of manipulating electronic ground states and shaping collective excitations in two-dimensional materials with cavities.In my talk, I will provide an overview of current ideas and challenges in this emerging field.Specifically, I will discuss our proposal of inducing electronic interactions through the coupling to a cavity [2]. Such interactions, mediated by the transverse electromagnetic field, are restricted to unobservably low temperatures in free space. I will argue that the strong confinement in nanoplasmonic cavities could enhance these exotic effects to experimentally accessible temperatures. Furthermore, at the hand of the 1D Fermi-Hubbard model, I will describe how the strong coupling to a cavity can affect the ground and excited states of correlated electron materials [3].

[1] G. Scalari,et al., Science 335, 1323 (2012); Q. Zhang et al., Nature Phys., 12, 1005 (2016); A. Bayer et al., Nano Lett. 17, 6340 (2017)
[2] F. Schlawin, A. Cavalleri and D. Jaksch, Phys. Rev. Lett. 122, 133602 (2019)
[3] M. Kiffner, J. R. Coulthard, F. Schlawin, A. Ardavan and D. Jaksch, Phys. Rev. B 99, 085116 (2019)