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UID:DSC-15556
DTSTART;TZID=Europe/Berlin:20190122T140000
SEQUENCE:1548115720
TRANSP:OPAQUE
DTEND;TZID=Europe/Berlin:20190122T150000
URL:https://dresden-science-calendar.de/calendar/en/detail/15556
LOCATION:MPI-PKS\, Nöthnitzer Straße 3801187 Dresden
SUMMARY:Juzeliunas: Novel topological lattices for ultracold atoms
CLASS:PUBLIC
DESCRIPTION:Speaker: Gediminas Juzeliunas\nInstitute of Speaker: Vilnius Un
 iversity\nTopics:\nPhysik\n Location:\n  Name: MPI-PKS (Seminarroom 4)\n  
 Street: Nöthnitzer Straße 38\n  City: 01187 Dresden\n  Phone: + 49 (0)35
 1 871 0\n  Fax: \nDescription: Usually optical lattices are produced by in
 terfering a number of laser beams. The atoms are trapped at the intensity 
 minima or maxima of an emerging interference pattern. The tunneling matrix
  elements for atoms in such lattices are real\, so the atomic motion is no
 t affected by a magnetic flux. The magnetic flux can be induced via the la
 ser-assisted tunneling between lattice sites or by shaking the lattice.  I
 n the initial part of the talk a novel way will be presented for creating 
 a topological optical lattice which is affected by a non-staggered magneti
 c flux without any conventional optical lattice added [1]. Two atomic inte
 rnal states are involved and their energies have opposite gradients in one
  spatial direction. The states are coupled by a multi-frequency laser radi
 ation propagating in a direction perpendicular to the energy gradient.  Su
 ch a periodic perturbation together with the energy gradient creates effec
 tively (in the Floquet picture) a square optical lattice affected by a non
 -staggered magnetic flux. By properly tuning the parameters of the system\
 , the energy bands of the lattice can be characterized by unit Chern numbe
 rs [1].   Subsequently we shall consider another possibility of producing 
 a topological optical lattices by using a set of long lived atomic interna
 l states as sites in an extra (synthetic) dimension [2\,3]. By taking a st
 andard 1D optical lattice and inducing the laser-assisted transitions betw
 een sites of the \"extra dimension\"\, one can effectively engineer a 2D l
 attice involving both real and synthetic dimensions\, and the lattice is a
 ffected by a non-staggered magnetic flux [3]. Usually such a semi-syntheti
 c lattice has a square geometry. Here we talk about a recent analysis of s
 emi-synthetic optical lattices characterized by a non-square geometry. In 
 particular we shall talk about a possibility to produce a semi-synthetic z
 igzag lattice affected by a magnetic flux\, and consider single and many-b
 ody properties of such a lattice [4].    1. T. Andrijauskas\, I. B. Spielm
 an and G. Juzeliūnas\, New J. Phys. 20\, 055001 (2018). 2. O. Boada\, A. 
 Celi\, J. I. Latorre and M. Lewenstein\, Quantum Simulation of an Extra Di
 mension\, Phys. Rev. Lett. 108\, 133001 (2012). 3. A. Celi\, P. Massignan\
 , J. Ruseckas\, N. Goldman\, I. B. Spielman\, G. Juzeliūnas and M. Lewens
 tein\, Synthetic Gauge Fields in Synthetic Dimensions\, Phys. Rev. Lett. 1
 12\, 043001 (2014). 4. E. Anisimovas\, M. Račiūnas\, C. Sträter\, A. Ec
 kardt\, I. B. Spielman and G. Juzeliūnas\, Phys. Rev. A 94\, 063632 (2016
 ).
DTSTAMP:20260927T143901Z
CREATED:20190118T000935Z
LAST-MODIFIED:20190122T000840Z
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