Bose–Fermi N-polaron state emergence from correlation-mediated blocking of phase separation
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 clustere...
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| Format: | Article |
| Language: | English |
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American Physical Society
2025-04-01
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| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.7.023053 |
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| author | Felipe Gómez-Lozada Hoshu Hiyane Thomas Busch Thomás Fogarty |
| author_facet | Felipe Gómez-Lozada Hoshu Hiyane Thomas Busch Thomás Fogarty |
| author_sort | Felipe Gómez-Lozada |
| collection | DOAJ |
| description | 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. |
| format | Article |
| id | doaj-art-7ea9d77a998342db8e47a76e0dd7e7a1 |
| institution | DOAJ |
| issn | 2643-1564 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Research |
| spelling | doaj-art-7ea9d77a998342db8e47a76e0dd7e7a12025-08-20T03:06:43ZengAmerican Physical SocietyPhysical Review Research2643-15642025-04-017202305310.1103/PhysRevResearch.7.023053Bose–Fermi N-polaron state emergence from correlation-mediated blocking of phase separationFelipe Gómez-LozadaHoshu HiyaneThomas BuschThomás FogartyWe 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.http://doi.org/10.1103/PhysRevResearch.7.023053 |
| spellingShingle | Felipe Gómez-Lozada Hoshu Hiyane Thomas Busch Thomás Fogarty Bose–Fermi N-polaron state emergence from correlation-mediated blocking of phase separation Physical Review Research |
| title | Bose–Fermi N-polaron state emergence from correlation-mediated blocking of phase separation |
| title_full | Bose–Fermi N-polaron state emergence from correlation-mediated blocking of phase separation |
| title_fullStr | Bose–Fermi N-polaron state emergence from correlation-mediated blocking of phase separation |
| title_full_unstemmed | Bose–Fermi N-polaron state emergence from correlation-mediated blocking of phase separation |
| title_short | Bose–Fermi N-polaron state emergence from correlation-mediated blocking of phase separation |
| title_sort | bose fermi n polaron state emergence from correlation mediated blocking of phase separation |
| url | http://doi.org/10.1103/PhysRevResearch.7.023053 |
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