SP seminar 10.11 @SISSA: Buljan

[Condensed Matter Section]

-------- Forwarded Message --------
Subject: 	SP seminar 10.11 @SISSA: Buljan
Date: 	Mon, 09 Nov 2015 09:34:20 +0100
From: 	Vincenzo Alba <valba at sissa.it>
Reply-To: 	joint ICTP/SISSA Statistical Physics Group Seminars 
<statistical_physics_seminar at lists.ictp.it>
To: 	statistical_physics_seminar at lists.ictp.it


JOINT ICTP/SISSA STATISTICAL PHYSICS SEMINAR


Tuesday, 10th November - 11:00 am

SISSA, room 128, 1st floor


*****************************************************************

Speaker: Hrvoje Buljan

Affiliation: University of Zagreb

Title: Synthetic Magnetic Fields for Atoms and Photons

I will present recent results of our group in the rapidly developing
field of synthetic magnetic fields for atoms and photons, in cold
atomic gases and photonic structures, respectively. The results can be
categorized in three closely related groups.
(i) It will be shown that a Hamiltonian with Weyl points can be
realized for ultracold atoms using laser-assisted tunneling in
three-dimensional optical lattices [1]. Weyl points are synthetic
magnetic monopoles that exhibit a robust, three-dimensional linear
dispersion, identical to the energy-momentum relation for relativistic
Weyl fermions, which are not yet discovered in particle physics. Weyl
semimetals are a promising new avenue in condensed matter physics due
to their unusual properties such as 'Fermi arc' surface states.
However, experiments on Weyl points are highly elusive. We show that
this elusive goal is well-within experimental reach with an extension
of techniques recently used in ultracold gases.
(ii) We present a grating assisted tunneling scheme for tunable
synthetic magnetic fields in photonic lattices. The synthetic fields
emerge from the nontrivial phases of the resulting tunneling matrix
elements. We propose implementation of the Harper-Hofstadter
Hamiltonian in these photonic lattices, and demonstrate its
realization by using the so-colled conical diffraction [2].
(iii) Finally, we present a novel theoretical proposal [3], and the
experimental demonstration [4], of synthetic magnetic fields that were
for the first time achieved in classical cold atomic gases. The scheme
utilizes radiation pressure forces and the Doppler effect. The
experiment was implemented in the 87Rb Magneto-Optical Trap [4].


REFERENCES
1. Tena Dubček, Colin J. Kennedy, Ling Lu, Wolfgang Ketterle, Marin
Soljačić, Hrvoje Buljan, Weyl points in three-dimensional optical
lattices: Synthetic magnetic monopoles in momentum space, Phys. Rev.
Lett. 114, 225301 (2015).
2. Tena Dubček, et al., submitted
3. T. Dubček, N. Šantić, D. Jukić, D. Aumiler, T. Ban, and H. Buljan,
Synthetic Lorentz force in classical atomic gases via Doppler effect
and radiation pressure, Phys. Rev. A 89, 063415 (2014).
4. Neven Šantić, Tena Dubček, Damir Aumiler, Hrvoje Buljan, Ticijana
Ban, Experimental Demonstration of a Synthetic Lorentz Force by Using
Radiation Pressure, Scientific Reports 5, 13485 (2015).

*****************************************************************


_______________________________________________
Statistical_physics_seminar mailing list
Statistical_physics_seminar at lists.ictp.it
https://lists.ictp.it/mailman/listinfo/statistical_physics_seminar