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Effective-action approach to dirty bosons in optical lattices
(Universidade Federal de São CarlosUFSCarPrograma de Pós-Graduação em Física - PPGFCâmpus São Carlos, 2019-02-21)
A system of cold bosonic atoms loaded in an optical lattice potential can undergo a macroscopic phase transition due to quantum fluctuations. As the depth of the lattice potential is increased, the ground state of the ...
Thermodynamic evidence for the Bose glass transition in twinned YBa2Cu3 O7-δ crystals
(American Physical Society, 2015-07-01)
We used a micromechanical torsional oscillator to measure the magnetic response of a twinned YBa2Cu3O7-δ single crystal disk near the Bose glass transition. We observe an anomaly in the temperature dependence of the ...
Bose glass and Mott glass of quasiparticles in a doped quantum magnet
(NATURE PUBLISHING GROUPLONDON, 2012)
The low-temperature states of bosonic fluids exhibit fundamental quantum effects at the macroscopic scale: the best-known examples are Bose-Einstein condensation and superfluidity, which have been tested experimentally in ...
Ultracold bosons in random lattice potentials
(Universidade Federal de São CarlosUFSCarPrograma de Pós-Graduação em Física - PPGFCâmpus São Carlos, 2023-04-06)
The Bose-Hubbard model describes short-range interacting spinless bosons on a random lattice. This model is realized in ultracold atomic systems where quantum phase transitions can be observed. When loaded into a deep ...
Quantum critical scaling at a Bose-glass/superfluid transition: Theory and experiment for a model quantum magnet
(AMER PHYSICAL SOCCOLLEGE PK, 2012)
In this paper we investigate the quantum phase transition from magnetic Bose Glass to magnetic Bose-Einstein condensation induced by amagnetic field in NiCl2 center dot 4SC(NH2)(2) (dichloro-tetrakis-thiourea-nickel, or ...
Bose systems in spatially random or time-varying potentials
(MAIK NAUKA/INTERPERIODICA/SPRINGER, 2009)
Bose systems, subject to the action of external random potentials, are considered. For describing the system properties, under the action of spatially random potentials of arbitrary strength, the stochastic mean-field ...
Ground-state properties of the disordered spin-1 Bose-Hubbard model: A stochastic mean-field theory study
(Amer Physical SocCollege PkEUA, 2012)
Solid-liquid transition in Nb powder determined by third harmonic susceptibility
(Elsevier B.V., 2008-07-01)
Measurements of the third harmonic of the AC-susceptibility were employed to determine the boundaries of the linear regime of the magnetic response of Nb powder. Non-linear contributions to the magnetic response reveal the ...