Work

Bose–Fermi N -polaron state emergence from correlation-mediated blocking of phase separation

Year: 2025

Type: article

Abstract: We study N fermionic impurities in a one-dimensional lattice bosonic bath at unit filling. Using DMRG and mixed boundary conditions—periodic for bosons, open for fermions—we find an N -polaron ground state replacing phase separation at high interspecies repulsion. This tightly bound state of clustered particles emerges due to strong impurity-bath correlations, which induce large impurity-impurity correlations that we quantify via the von Neumann entropy and bipartite mutual information, respectively. This system also reveals a fermionic self-localization effect from a Mott insulator background due to local correlations between the impurities and the bath. The growth of long-range correlations breaks this Mott phase, resulting in the transition to impurity clusters delocalized along the system. Finally, we show that there is a critical impurity number, which depends on intraspecies bosonic interaction, beyond which phase separation is recovered.

Source: Physical Review Research

DOI: 10.1103/physrevresearch.7.023053

Authors: Felipe Gómez-Lozada, Hoshu Hiyane, Thomas Busch, Thomás Fogarty

Institution: Okinawa Institute of Science and Technology Graduate University

Language: English

Topic: Quantum many-body systems

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,625

Funders: South Carolina Department of Agriculture, Japan Science and Technology Corporation, Okinawa Institute of Science and Technology Graduate University, Japan Society for the Promotion of Science