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cond-mat.str-el2020
Hund's coupling-assisted ferromagnetic percolation transition in a multiorbital flat band
Eric Bobrow, Junjia Zhang, Yi Li
By connecting Hund's physics with flat band physics, we establish an exact result for studying ferromagnetism in a multiorbital system. We consider a two-layer model consisting of…
cond-mat.str-el2018
Monopole Charge Density Wave States in Weyl Semimetals
Eric Bobrow, Canon Sun, Yi Li
We study a new class of topological charge density wave states exhibiting monopole harmonic symmetries. The density-wave ordering is equivalent to pairing in the particle-hole chan…
cond-mat.str-el2018
Exact Results on Itinerant Ferromagnetism and the 15-puzzle Problem
Eric Bobrow, Keaton Stubis, Yi Li
We apply a result from graph theory to prove exact results about itinerant ferromagnetism. Nagaoka's theorem of ferromagnetism is extended to all non-separable graphs except single…