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Physics & Astronomy Colloquium
April 12 @ 3:30 pm - 5:00 pm
Speaker: Jinwu Ye (Mississippi State)
Title: Quantum magnetisms in disordered or spin-orbit coupled systems
In this colloquium, we review recent worldwide experimental advances to
generate various kinds of spin-orbital couplings (SOC) in cold atom
systems in an optical lattice and also experiments on spin-orbital coupled
materials in 4d or 5d transition metal oxides.
After a brief introduction to magnetisms in quantum Ferromagnetic
Heisenberg and anti-ferromagnetic Heisenberg model, we will discuss
quantum Random Heisenberg model a simplified version of which called
Sachdev-Ye-Kitaev model can stimulate quantum chaos and quantum
information propagations in a black-hole through AdS_2/CFT_1
correspondence. After briefly reviewing anti-ferromagnetic Heisenberg
model in a geometrically frustrated lattice and a spin-bond correlated
quantum spin model called Kitaev model, we will discuss quantum Ferro- and
Anti-ferromagnet Heisenberg model subject to Spin-orbit couplings which
host In-commensurate non-coplanar Skyrmion crystal phases, devil
staircases, Cantor sets and multi-fractals.
Implications on current or near future cold atom systems and on 4d or 5d
transition metal oxides will be discussed.
The colloquium will be preceded by light refreshments in GL227 from 3:45 – 4:00p.m.