Dynamics of weakly interacting bosons in optical lattices with flux

Znanstveni rad - Izvorni znanstveni rad

• Autor: Ana Hudomal
• Autor: Ivana Vasić
• Autor: Hrvoje Buljan
• Autor: Walter Hofstetter
• Autor: Antun Balaž
• Autorova ustanova: Sveučilište u Zagrebu; Prirodoslovno-matematički fakultet; (Fizički odsjek)
• Znanstveno / umjetničko područje, polje i grana: PRIRODNE ZNANOSTI; Fizika

Sažetak (engleski)

Realization of strong synthetic magnetic fields in driven optical lattices has enabled implementation of topological bands in cold-atom setups. A milestone has been reached by a recent measurement of a finite Chern number based on the dynamics of incoherent bosonic atoms. The measurements of the quantum Hall effect in semiconductors are related to the Chern-number measurement in a cold-atom setup; however, the design and complexity of the two types of measurements are quite different. Motivated by these recent developments, we investigate the dynamics of weakly interacting incoherent bosons in a two-dimensional driven optical lattice exposed to an external force, which provides a direct probe of the Chern number. We consider a realistic driving protocol in the regime of high driving frequency and focus on the role of weak repulsive interactions. We find that interactions lead to the redistribution of atoms over topological bands both through the conversion of interaction energy into kinetic energy during the expansion of the atomic cloud and due to an additional heating. Remarkably, we observe that the moderate atomic repulsion facilitates the measurement by flattening the distribution of atoms in the quasimomentum space. Our results also show that weak interactions can suppress the contribution of some higher-order nontopological terms in favor of the topological part of the effective model.

• Jezik: engleski
• Vrsta publikacije: Znanstveni rad - Izvorni znanstveni rad
• Status objave: Objavljen
• Vrsta recenzije: Recenziran - međunarodna recenzija
• Verzija publikacije: Objavljena verzija rada (izdavačev PDF)
• Naslov časopisa: Physical Review A
• Brojčani podaci: vol. 98, br. 5, 053625
• p-ISSN: 2469-9926
• e-ISSN: 2469-9934
• DOI: https://doi.org/10.1103/PhysRevA.98.053625
• URN:NBN: urn:nbn:hr:217:073127
• Datum objave publikacije: 2018
• URL dokumenta: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.98.053625
• Vrsta resursa: Tekst
• Prava pristupa: Otvoreni pristup
• Javna napomena: © 2018 American Physical Society. Received 19 September 2018; Published 26 November 2018.
• Datum i vrijeme pohrane: 2020-03-01 17:42:58