Najbliższe Konwersatorium Fizyczne OK PTF odbędzie się w dniu 22 października 2020 r. o godz. 16:15, online na platformie MS TEAMS.

Dr hab. Jacek Szczytko (Institute of Experimental Physics, Faculty of Physics, University of Warsaw, Poland) wygłosi referat:
„Synthetic Hamiltonians and spin-orbit engineering in tunable birefringent microcavities”.

Streszczenie:
Spin-orbit optical interactions in photonic systems exploit the analogy between the quantum mechanical description of electronic spin-orbit system and synthetic Hamiltonians derived for propagation of electromagnetic waves in dedicated spatial structures. We have invented a method to control electrically spin-orbit coupling (SOC) of light using specially designed photonic structures - birefringent microcavities. The SOC effects led to the observation of an optical analogue of the spin Hall effect and the realization of artificial gauge fields.
In solid-state systems with broken inversion symmetry, SOC leads to the so-called Dresselhaus and Bychkov-Rashba SOC Hamiltonians, which are of particular interest in the context of spintronics, topological insulators, and superconductors. However, SOC in solid-state matter cannot be easily controlled and modified. Clever engineering of diverse gauge fields could provide control over physical parameters of quantum system. Using a liquid crystal–filled photonic cavity, our team managed to emulate an optical spin Hall effect for parameters range far beyond those previously considered experimentally and theoretically [1]. Recently we discovered Rashba-Dresselhaus spin-orbit coupling in a photonic system and showed control of an artificial Zeeman splitting [2]. Our results illustrate an effective approach of engineering artificial gauge fields and synthetic Hamiltonians with photons for the simulation of nontrivial condensed matter and quantum phenomena.

[1] K. Lekenta, et al., Tunable optical spin Hall effect in a liquid crystal microcavity. Light Sci. Appl. 7, 74 (2018).
[2] K. Rechcińska, et al. Photonic Engineering of Spin-Orbit Synthetic Hamiltonians in Liquid Crystal, Science 366, Issue 6466, pp. 727-730 (2019)

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