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Collective modes and emergent SO(6) symmetry in the iron pnictides
Daniel Podolsky, Hae-Young Kee, Yong Baek Kim
We show the existence of an emergent SO(6) symmetry in the low energy description of the iron pnictides. This approximate symmetry provides a unifying framework for the occurrence…
Origin and consequence of an unpinned helical magnet: application to partial order in MnSi under pressure
John M. Hopkinson, Hae-Young Kee
We study a classical ferromagnetic Heisenberg model in the presence of Dzyaloshinskii-Moriya interactions on the corner-shared triangle lattice formed by the Mn sites of MnSi. We s…
Theory of spin nematic to spin-Peierls quantum phase transition in ultracold spin-1 atoms in optical lattices
Christoph M. Puetter, Michael J. Lawler, Hae-Young Kee
We present a theory of the anisotropy tuned quantum phase transition between spin nematic and spin-Peierls phases in S=1 systems with significant bi-quadratic exchange interactions…
Quantum oscillations of ortho-II YBa_2Cu_3O_6.5
Daniel Podolsky, Hae-Young Kee
Motivated by quantum oscillations observed in highly ordered ortho-II YBa_2Cu_3O_6.5, we study the Fermi surface topology of d-density wave (ddw) or antiferromagnetic (AF) ordering…
Fate of partial order on the trillium and distorted windmill lattices
Sergei V. Isakov, John M. Hopkinson, Hae-Young Kee
The classical Heisenberg model on the trillium and distorted windmill lattices exhibits a degenerate ground state within large- theory, where the degenerate wavevectors form a s…