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We review the path-integral quantum Monte Carlo method and discuss its implementation by multiworm algorithms. We analyze in details the features of the algorithms, and focus our attention on the computation of the $N$-body density matrix to study N-
Externí odkaz:
http://arxiv.org/abs/1808.01030
Publikováno v:
New J. Phys. 20 (2018) 045001
Quantum dynamics of impurities in a bath of bosons is a long-standing problem of solid-state, plasma, and atomic physics. Recent experimental and theoretical investigations with ultracold atoms focused on this problem, studying atomic impurities imme
Externí odkaz:
http://arxiv.org/abs/1707.09568
Autor:
Lingua, F., Penna, V.
A bosonic gas formed by two interacting species trapped in a double-well potential features macroscopic localization effects when the interspecies interaction becomes sufficiently strong. A repulsive interaction spatially separates the species into d
Externí odkaz:
http://arxiv.org/abs/1706.03804
Autor:
Salasnich, L., Penna, V.
Publikováno v:
New J. Phys. 19, 043018 (2017)
We study a two-dimensional fermionic cloud of repulsive alkali-metal atoms characterized by two hyperfine states which are Rabi coupled. Within a variational Hartree-Fock scheme, we calculate analytically the ground-state energy of the system. Then w
Externí odkaz:
http://arxiv.org/abs/1704.00483
Publikováno v:
J. Phys. B: At. Mol. Opt. Phys. 49 205005 (2016)
We investigate the ground-state properties of a two-species condensate of interacting bosons in a double-well potential. Each atomic species is described by a two-space-mode Bose-Hubbard model. The coupling of the two species is controlled by the int
Externí odkaz:
http://arxiv.org/abs/1609.08459
Publikováno v:
Scientific Reports 7, (2017) 5105
Motivated by recent experiments and theoretical investigations on binary mixtures, we investigate the miscible-immiscible transition at finite temperature by means of Quantum Monte Carlo. Based on the observation that the segregated phase is strongly
Externí odkaz:
http://arxiv.org/abs/1609.08352
Publikováno v:
Phys. Rev. A 92, 053610 (2015)
Motivated by recent experiments on two-component systems, we investigate the ground-state phase diagram of a mixture of two bosonic species by means of path-integral quantum Monte Carlo by the two-worm algorithm. The mixture is trapped in a square la
Externí odkaz:
http://arxiv.org/abs/1507.08877
Publikováno v:
Phys. Rev. A 87, 053620 (2013)
We study interacting dipolar atomic bosons in a triple-well potential within a ring geometry. This system is shown to be equivalent to a three-site Bose-Hubbard model. We analyze the ground state of dipolar bosons by varying the effective on-site int
Externí odkaz:
http://arxiv.org/abs/1304.1573
Publikováno v:
Phys. Rev. A 82, 021601(R) (2010)
We perform a numeric study (Worm algorithm Monte Carlo simulations) of ultracold two-component bosons in two-dimensional optical lattices. We study how the Mott insulator to superfluid transition is affected by the presence of a second superfluid bos
Externí odkaz:
http://arxiv.org/abs/1005.0463