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Title: Exact results on itinerant ferromagnetism and the 15-puzzle problem

Journal Article · · Physical Review B

Here, we apply a result from graph theory to prove exact results about itinerant ferromagnetism. Nagaoka’s theorem is extended to all nonseparable graphs except single polygons with more than four vertices by applying the solution to the generalized 15-puzzle problem, which studies whether the hole’s motion can connect all possible tile configurations. This proves that the ground state of a U →∞ Hubbard model with one hole away from the half filling on a two-dimensional honeycomb lattice or a three-dimensional diamond lattice is fully spin polarized. Furthermore, the condition of connectivity for N-component fermions is presented, and Nagaoka’s theorem is also generalized to SU(N)-symmetric fermion systems on nonseparable graphs.

Research Organization:
Johns Hopkins Univ., Baltimore, MD (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FG02-08ER46544
OSTI ID:
1484425
Alternate ID(s):
OSTI ID: 1482764
Journal Information:
Physical Review B, Vol. 98, Issue 18; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 10 works
Citation information provided by
Web of Science

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Ferromagnetism in the SU ( n ) Hubbard model with a nearly flat band journal December 2019

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