Schedule Logo
Poster Session

Poster Session II

4:00 pm – 6:00 pm, Wednesday June 18 Session H00 Oregon Convention Center, Exhibit Hall E
Topics:
PrevNext

Quantum phases in frustrated triangular and kagome optical lattices at negative absolute temperatures

Poster 117
Presenter: Luca Donini (Univ of Cambridge)
Authors: Mehedi Hasan (Univ of Cambridge), Sompob Shanokprasith (Univ of Cambridge), Daniel Braund (Univ of Cambridge), Tobias Marozsak (Univ of Cambridge), Liam Crane (Univ of Cambridge), Tim Rein (Univ of Cambridge), Marnix Barendregt (Univ of Cambridge), Daniel Reed (Univ of Cambridge), Max Melchner von Dydiowa (Univ of Cambridge), Tiffany Harte (Univ of Cambridge), Ulrich Schneider (Univ of Cambridge)

We report on recent experiments investigating the phase diagram of bosons in the triangular and kagome optical lattices. We explore the frustrated physics of these lattices by creating negative absolute temperature states where the sign of the tunnelling is effectively inverted. Notably, in this scheme the Hamiltonian remains static and there is no Floquet heating, leading to long lifetimes. In the triangular lattice, we observe that in the frustrated case the critical interaction strength for the bosonic superfluid to Mott insulator transition is strongly reduced. We also investigate signatures of the chiral nature of the superfluid and the dynamics of the transition. In the kagome lattice, we have prepared a long-lived state of ultracold bosons in the flat band. We study the melting of the Mott insulator into the flat band and report on our latest measurements characterising the flat-band state with a variety of time-of-flight techniques.

Funding acknowledgement

We acknowledge funding by the European Union (ERC), EPSRC, the QCS and QCI3 hub, and UKRI.

POSTERS (156)