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Theoretical Physics Seminar

Theoretical Physics Seminar Stacjonarnie

Pair up or separate? Competition between attraction and spin-dependent external force in a Hubbard model

09-09-2025 12:00 - 13:00
Venue
Institute of Physics PAS, Room D, Building I
Speaker
dr Jacek Dobrzyniecki
Affiliation
Okinawa Institute of Science and Technology Graduate University
Sala
Room D (Building I)

I numerically investigate the ground-state properties of a one-dimensional Fermi-Hubbard model with attractive interactions (U < 0), subject to a linear, spin-dependent external potential with a tunable slope. This potential creates oppositely located wells for spin-up and spin-down particles. I explore how the competition between attractive on-site interactions and the external potential leads to distinct ground-state phases with different spatial density profiles. As the slope increases, the system undergoes a sequence of transitions: from an unpolarized state, to a phase-separated configuration, and finally to a fully spin-separated phase. I identify the critical slope values that mark these transitions and show that they can be estimated analytically using the local-density approximation (LDA). These results reveal a rich interplay between interactions and external forces. I discuss potential realizations of this model in cold-atom systems and solid-state systems.

 
 

List of Dates (Page event details)

  • 09-09-2025 12:00 - 13:00
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