Thermometry of bosonic mixtures in Optical Lattices via Demixing

TL;DR

This paper proposes a thermometry method for binary bosonic mixtures in optical lattices based on demixing behavior, which is highly sensitive at low temperatures near the tunneling amplitude, aiding quantum magnetism studies.

Contribution

It introduces a novel thermometry technique using demixing in bosonic mixtures, applicable at low temperatures relevant for quantum magnetism.

Findings

Demixing degree effectively measures temperature in bosonic mixtures.

Method is highly sensitive at temperatures near the tunneling amplitude.

Suitable for exploring quantum magnetic regimes.

Abstract

Motivated by recent experiments and theoretical investigations on binary mixtures, we investigate the miscible-immiscible transition at finite temperature by means of Quantum Monte Carlo. Based on the observation that the segregated phase is strongly affected by temperature, we propose to use the degree of demixing for thermometry of a binary bosonic mixture trapped in an optical lattice. We show that the proposed method is especially sensitive at low temperatures, of the order of the tunnelling amplitude, and therefore is particularly suitable in the regime where quantum magnetism is expected.