Mainz 2026 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 5: Ultracold Matter II – Bosons (joint session Q/A)

A 5.1: Vortrag

Montag, 2. März 2026, 17:00–17:15, P 2

In-situ cooling of bosonic Mott insulators via reservoir engineering — •Michele Miotto, Francesco Petiziol, and André Eckardt — Institut für Physik und Astronomie, Technische Universität Berlin

The preparation of pristine Mott insulator (MI) states of ultracold atoms in optical lattices is a crucial resource for a wide range of quantum simulation experiments. Although these systems offer remarkable controllability, small fractions of excitations inevitably emerge during lattice loading, which can significantly affect experimental quality. This limitation highlights the need for new in-situ cooling techniques to purify imperfect MIs. In this work, we theoretically propose and analyze a reservoir-engineering scheme aimed at mitigating such excitations. Specifically, we investigate whether a portion of a two-dimensional lattice can act as an engineered bath for a smaller subsystem hosting the MI. Focusing on a bosonic MI at unit density, confined to a one-dimensional strip and characterized by doublon-holon impurities, we use numerical simulations to test whether tuning the bath parameters can induce irreversible absorption of these excitations, thereby stabilizing the MI toward a uniform density profile.

Keywords: Ultracold Bosons; Reservoir Engineering; In-situ Cooling; State Preparation