title: Tuning the disorder in superglasses.
abstract: We study the interplay of superfluidity, glassy, and magnetic orders in the XXZ model with random Ising interactions on a three dimensional cubic lattice. In the classical limit, this model reduces to a ±J Edwards-Anderson Ising model with concentration p of ferromagnetic bonds, which hosts a glassy-ferromagnetic transition at a critical concentration p(c)(cl)~0.77. Our quantum Monte Carlo simulation results show that quantum fluctuations stabilize the coexistence of superfluidity and glassy order (superglass), and shift the (super)glassy-ferromagnetic transition to p(c)>p(c)(cl). In contrast, antiferromagnetic order coexists with superfluidity to form a supersolid, and the transition to the glassy phase occurs at a higher p.
authors.affiliation: Department of Physics, National Taiwan University, Taipei 10607, Taiwan.
authors.forename: Derek
authors.initials: D
authors.lastname: Larson
authors.forename: Ying-Jer
authors.initials: YJ
authors.lastname: Kao