2006/02/22 by Tommaso Roscilde · 29 citations
Physics and Astronomy · #Cold Atom Physics and Bose-Einstein Condensates #Condensed matter physics #Field (mathematics) #Magnetic field #Magnetization #Monte Carlo method #Neutron scattering #Phase (matter) #Phase diagram #Physics #Physics of Superconductivity and Magnetism #Quantum #Quantum Monte Carlo #Quantum and electron transport phenomena #Quantum mechanics #Scattering #Statistics #cond-mat.dis-nn #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.74.144418
published in Physical Review B 74(14) (American Physical Society) · 13 pages, 7 figures
arxiv created 2006/02/22 · openalex publication_date 2006/10/20 · arxiv updated 2010/03/23 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
In the present paper we discuss the rich phase diagram of S=(1)/(2) weakly coupled dimer systems with site dilution as a function of an applied uniform magnetic field. Performing quantum Monte Carlo simulations on a site-diluted bilayer system, we find a sequence of three distinct quantum-disordered phases induced by the field. Such phases divide a doping-induced order-by-disorder phase at low fields from a field-induced ordered phase at intermediate fields. The three quantum disordered phases are a gapless disordered-free-moment phase, a gapped plateau phase, and two gapless Bose-glass phases. Each of the quantum-disordered phases have distinct experimental signatures that make them observable through magnetometry and neutron scattering measurements. In particular the Bose-glass phase is characterized by an unconventional magnetization curve whose field dependence is exponential. Making use of a local-gap model, we relate directly this behavior to the statistics of rare events in the system.