Renginiai ir įvykiai

Realizing a one-dimensional topological gauge theory in an optically dressed Bose-Einstein condensate

Speaker: Leticia Tarruell, ICFO-The Institute of Photonic Sciences, Castelldefels (Barcelona), Spain
Date and time: Wednesday, 1 December 2021, 14:00 Vilnius time
Location: MSTeams meeting (link below)

Quantum gases constitute a versatile testbed for exploring the behaviour of quantum matter subjected to electric and magnetic fields. While most experiments consider classical gauge fields that act as a simple static background for the atoms, gauge fields appearing in nature are instead quantum dynamical entities that are influenced by the spatial configuration and motion of matter, and that fulfil local symmetry constraints. In my talk, I will discuss our recent realization of a chiral BF theory: a topological gauge theory for linear anyons that corresponds to a possible one-dimensional reduction of the Chern-Simons gauge theory effectively describing fractional quantum Hall systems ^[1-3]. By using the local symmetry constraint of the theory, we encode the gauge field in terms of the matter field. The result is a system with chiral interactions, which we engineer in a potassium Bose-Einstein condensate by synthesizing optically dressed atomic states with a momentum-dependent scattering length. When this dependence is linear, matter behaves as if minimally coupled to a density-dependent vector potential. Theoretically, we show that the system then realizes the chiral BF Hamiltonian at the quantum level. Experimentally, we observe its two main features: the formation of chiral bright solitons - self-bound states of the matter field that only exist when propagating in one direction – and the back-action of matter into the gauge field. Our results establish chiral interactions as a novel resource for quantum simulation experiments with ultracold atoms and pave the way towards implementing topological gauge theories in higher dimensions ^[4].
[1] S. J. B. Rabello, Phys. Rev. Lett. 76, 4007 (1996).
[2] U. Aglietti, L. Griguolo, R. Jackiw, S.-Y. Pi, and D. Seminara, Phys. Rev. Lett. 77, 4406 (1996).
[3] M. J. Edmonds, M. Valiente, G. Juzeliūnas, L. Santos, and P. Öhberg, Phys. Rev. Lett. 110, 085301 (2013).
[4] G. Valentí-Rojas, N. Westerberg, and P. Öhberg, Phys. Rev. Research 2, 033453 (2020).

MSTeams link: https://teams.microsoft.com/l/channel/19%3a95ac9712144e4ab6b0c1040404c7dc84%40thread.tacv2/General?groupId=2feb718a-6943-4d00-98f4-c39354a50253&tenantId=82c51a82-548d-43ca-bcf9-bf4b7eb1d012
Passcode: 1wd20v6

Laikas: 2021 gruodžio 22 d. 13 val.

Vieta: 310 kab. Fizikos fakultetas

Registracija el. paštu iki gruodžio 21d.:

What is data and why it is important? (LT/EN)

Dana Kuznecovaite, Data Process manager at SEB ()

What is data? Why so many companies set it as a number one priority on their strategy these days? What does it mean being data driven? Where SEB is on this journey? How do I contribute to SEB data strategy?
There will be some simple examples to illustrate and support he questions listed above. The aim would be for students to understand the importance of data as well as why this journey is so complex, but inevitable. Also, what competencies are required for working with data related areas.