3 papers
cond-mat.str-el2026
Magnetic long-range order at finite temperature in two-dimensional hyperbolic lattices
Alexander Hickey, Joseph Maciejko
Infrared singularities of gapless Goldstone modes preclude magnetic long-range order at finite temperature in conventional two-dimensional systems. By studying the spin- Heisenb…
cond-mat.str-el2025
Universal temperature-dependent power law excitation gaps in frustrated quantum spin systems harboring order-by-disorder
Alexander Hickey, Jeffrey G. Rau, Subhankar Khatua +1
When magnetic moments are subject to competing or frustrated interactions, continuous degeneracies that are not protected by any symmetry of the parent Hamiltonian can emerge at th…
cond-mat.str-el2025
Order-by-disorder without quantum zero-point fluctuations in the pyrochlore Heisenberg ferromagnet with Dzyaloshinskii-Moriya interactions
Alexander Hickey, Daniel Lozano-Gómez, Michel J. P. Gingras
Order-by-disorder, whereby fluctuations lift an accidental classical ground state degeneracy to stabilize a subset of ordered states, is a recurrent and prominent theme in the fiel…