Journal
PHYSICAL REVIEW B
Volume 101, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.101.045112
Keywords
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Funding
- CAPES agency, Brazil [001]
- Ministry of Education (MEC)
- CNPq agency, Brazil
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The existence of the Nagaoka ferromagnetism is examined in the context of the one-dimensional U = infinity Hubbard model. We construct the exact quantum partition function to describe the physics of such a regime. Our calculation reveals that, while the ground state in an open chain is always spin degenerate, in a finite size closed chain with at least one vacancy, the ground state can only be ferromagnetic when the number of electrons is less than or equal to three. Our results shed more light on a very recent experimental verification of Nagaoka ferromagnetism in a quantum dot setup.
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