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 indicated that a spin Hamiltonian with on-site Kondo coupling may be the effective many-body Hamiltonian for ${\text{Ba}}_2{\text{NiO}}_2{\text{(AgSe)}}_2$ (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.

arXiv comment11 pages, 6 figures, 2 tables

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Cited by in corpus (6)

• Low Valence Nickelates: Launching the Nickel Age of Superconductivity
• Generating function for projected entangled-pair states
• Variational Tensor Network Operator
• Cubic ferromagnet and emergent $U(1)$ symmetry on its phase boundary
• Realization of a triangular spin necklace in a verdazyl-based Ni complex
• Programmable order by disorder effect and underlying phases through dipolar quantum simulators