Field-induced Bose-Einstein condensation and supersolid in the two-dimensional Kondo necklace

Abstract The application of an external magnetic field of sufficient strength to a spin system composed of a localized singlet can overcome the energy gap and trigger bosonic condensation and so provide an alternative method to realize exotic phases of matter in real materials. Previous research has...

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Published inCommunications physics Vol. 5; no. 1; pp. 1 - 8
Main Authors Tu, Wei-Lin, Moon, Eun-Gook, Lee, Kwan-Woo, Pickett, Warren E., Lee, Hyun-Yong
Format Journal Article
LanguageEnglish
Published London Nature Publishing Group 30.05.2022
Nature Portfolio
Subjects
Bose-Einstein condensates
Energy gap
Magnetic fields
Magnets
Phase diagrams
Phases
Superconductivity
Tensors
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Summary:Abstract The application of an external magnetic field of sufficient strength to a spin system composed of a localized singlet can overcome the energy gap and trigger bosonic condensation and so provide an alternative method to realize exotic phases of matter in real materials. Previous research has indicated that a spin Hamiltonian with on-site Kondo coupling may be the effective many-body Hamiltonian for Ba 2 NiO 2 (AgSe) 2 (BNOAS) and here we study such a Hamiltonian using a tensor network ansatz in two dimensions. Our results unveil a phase diagram which indicates the underlying phases of BNOAS. We propose, in response to the possible doping-induced superconductivity of BNOAS, a fermionic model for further investigation. We hope that our discovery can bring up further interest in both theoretical and experimental researches for related nickelate compounds.
ISSN:2399-3650
2399-3650
DOI:10.1038/s42005-022-00913-3