Zobrazeno 1 - 10
of 172
pro vyhledávání: '"Streltsov, Alexej I."'
Publikováno v:
Rev. Mod. Phys. 92, 11001 (2020)
In this Colloquium, the wavefunction-based Multiconfigurational Time-Dependent Hartree approaches to the dynamics of indistinguishable particles (MCTDH-F for Fermions and MCTDH-B for Bosons) are reviewed. MCTDH-B and MCTDH-F or, together, MCTDH-X are
Externí odkaz:
http://arxiv.org/abs/1908.03578
Publikováno v:
Chem. Phys. 509, 45 (2018)
The anisotropy of a trap potential can impact the density and variance of a Bose-Einstein condensate (BEC) in an opposite manner. We exemplify this effect for both the ground state and out-of-equilibrium dynamics of structureless bosons interacting b
Externí odkaz:
http://arxiv.org/abs/1709.04223
Publikováno v:
Phys. Rev. A 98, 013618 (2018)
We present a technique to diagnose the condensate fraction in a one-dimensional optical lattice of weakly interacting bosons based on the dynamics of the trapped atoms under the influence of a momentum kick. It is shown using the Multi-Configuration
Externí odkaz:
http://arxiv.org/abs/1705.10643
Publikováno v:
Phys. Rev. A 95, 063602 (2017)
In this work, we study many-body excitations of Bose-Einstein condensates (BECs) trapped in periodic one-dimensional optical lattices. In particular, we investigate the impact of quantum depletion onto the structure of the low-energy spectrum and con
Externí odkaz:
http://arxiv.org/abs/1612.06711
Publikováno v:
J. Phys.: Conf. Ser. 826, 012020 (2017)
The variance and uncertainty product of the position and momentum many-particle operators of structureless bosons interacting by a long-range inter-particle interaction and trapped in a single-well potential are investigated. In the first example, of
Externí odkaz:
http://arxiv.org/abs/1611.07553
Autor:
Theisen, Marcus, Streltsov, Alexej I.
Publikováno v:
Phys. Rev. A 94, 053622 (2016)
We employ the MultiConfiguraional Time-Dependent Hartree for Bosons (MCTDHB) method to study excited states of interacting Bose-Einstein condensates confined by harmonic and double-well trap potentials. Two approaches to access excitations, a static
Externí odkaz:
http://arxiv.org/abs/1608.08060
Publikováno v:
Chem. Phys. 482, 362 (2017)
A mixture of two kinds of identical bosons held in a harmonic potential and interacting by harmonic particle-particle interactions is discussed. This is an exactly-solvable model of a mixture of two trapped Bose-Einstein condensates which allows us t
Externí odkaz:
http://arxiv.org/abs/1605.05608
Publikováno v:
Phys. Rev. A 93, 023605 (2016)
In the present work we show, analytically and numerically, that the variance of many-particle operators and their uncertainty product for an out-of-equilibrium Bose-Einstein condensate (BEC) can deviate from the outcome of the time-dependent Gross-Pi
Externí odkaz:
http://arxiv.org/abs/1509.00762
Publikováno v:
Phys. Rev. A 92, 043627 (2015)
In this work, we study the out-of-equilibrium many-body tunneling dynamics of a Bose-Einstein condensate in a two-dimensional radial double well. We investigate the impact of interparticle repulsion and compare the influence of angular momentum on th
Externí odkaz:
http://arxiv.org/abs/1508.03238
Autor:
Brouzos, Ioannis, Streltsov, Alexej I., Negretti, Antonio, Said, Ressa S., Caneva, Tommaso, Montangero, Simone, Calarco, Tommaso
Publikováno v:
Phys. Rev. A 92, 062110 (2015)
We extend the concept of quantum speed limit -- the minimal time needed to perform a driven evolution -- to complex interacting many-body systems. We investigate a prototypical many-body system, a bosonic Josephson junction, at increasing levels of c
Externí odkaz:
http://arxiv.org/abs/1412.6142