НАУЧНЫЙ СЕМИНАР ИНСТИТУТА СПЕКТРОСКОПИИ РАН Polariton lattices: a novel platform for analogue simulation. Доклад состоится в четверг 13 апреля 2017 г. в 11:00 в конференц-зале Института спектроскопии РАН

НАУЧНЫЙ СЕМИНАР ИНСТИТУТА СПЕКТРОСКОПИИ РАН

Polariton lattices: a novel platform
for analogue simulation
Pavlos Lagoudakis
Professor, Department of Physics and Astronomy, University of
Southampton, UK; Skolkovo Institute of Science and Technology,
Russian Federation
We introduce polariton lattices as a new platform for analogue simulation; based on well-established
semiconductor and optical control technologies polariton simulators allow for rapid scalability, ease of
tunability and effortless readability. Polariton condensates can be imprinted into any two-dimensional
lattices either by spatial modulation of the pumping laser [1] or by lithographic techniques during the
growth process [2], offering straightforward scalability. In the case of optically imprinted polariton
lattices with freely propagating polariton condensates, we recently demonstrated that the phaseconfiguration
acquired in a polariton dyad or triad is chosen so as to maximise polariton occupancy [3],
while by expanding to square, and rhombic lattices as well as to arbitrary polariton graphs we simulated
annealing of the XY Hamiltonian through bosonic stimulation [4].
By controlling the separation distance, in-plane wavevector, and spin of the injected condensates
in polariton graphs, we acquire several degrees of freedom in the tunability of intersite interactions,
whilst the continuous coupling of polaritons to free photons offers effortless readability of all the
characteristics of the polariton condensates such as energy, momentum, spin, and most critically their
phase. The above constitute a unique toolbox for realising intriguing discrete giant vortices, controllable
next nearest neighbour interactions, and dynamic phase transitions [5], such as the one shown in the
reciprocal and real space images of 100 coherently coupled condensates. The top/bottom row
corresponds to ferromagnetic/anti-ferromagnetic alignment at two different instances in the time domain
upon pulsed excitation, where we have utilised the time-dependence of the couplings in the XYHamiltonian
via the transient in-plane wavevector.
References
[1] G. Tosi, et al., Nature Physics 8, 190194 (2012)
[2] Na Young Kim, et al., Nature Physics 7, 681686 (2011) [3] Ohadi, H. et al. Phys. Rev. X, 6, 031032 (2016)
[4] Berloff, N.G et al. arXiv:1607.06065 (2016)
[5] Hohenberg and Halperin Rev. Mod. Phys. 49, 435 (1977)
Доклад состоится 13 апреля 2017 г. в 11:00 в конференц-зале Института
спектроскопии РАН (ИСАН) по адресу: 142190 г. Москва, г.Троицк
ул. Физическая, 5, Институт спектроскопии РАН.
Телефон для справок: +7 (495) 851-0579.

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