Liste des séminaires  | Jeudi 07 juin 2018
Page modifiée le Jeudi 28 juin 2012
Jeudi 07 juin 2018 à 11:00
Salle : D102 - Institut Galilée
Radu Chicireanu
Laboratoire PhLAM
Bât. P5 - USTL
Université de Lille 1
59655 Villeneuve d’Ascq CEDEX

The symmetry characteristics of the disordered system are expected to greatly affect its localization and transport properties – yet few experimental results in this direction are available today.
Here we will present a novel technique which allows the realization an artificial gauge field in a synthetic (temporal) dimension of a disordered, periodically driven (Floquet) quantum system.
Our remarkably simple technique is used experimentally to control the Time-Reversal Symmetry properties of the quantum kicked rotor [1], and leads to two novel experimental observations, representing `smoking-gun' signatures of this symmetry breaking. The first consists in the first observation of the “Coherent Forward Scattering” (CFS) [2], a direct interferential signature of the Anderson localization. The second is the measurement of the scaling function Beta(g) [3] in the weak localization regime, with a test of the one-parameter scaling hypothesis, and of its universality in two different symmetry classes.

[1] Moore, F.L. et al., Atom optics realization of the quantum d-kicked rotor, Phys. Rev. Lett. 75, 4598–4601 (1995)

[2] Karpiuk, T. et al. Coherent forward scattering peak induced by Anderson localization, Phys. Rev. Lett. 109, 190601 (2012)

[3] Abrahams, E., Anderson, P. W., Licciardello, D. C. & Ramakrishnan, T. V. Scaling theory of localization: absence of quantum diffusion in two dimensions, Phys. Rev. Lett. 42, 673–676 (1979)

Symmetries and quantum interference effects in the weak and strong localization regimes: observation of the Coherent Forward Scattering

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