Bibliographies thématiques / Bosonic binary mixture

Littérature scientifique sur le sujet « Bosonic binary mixture »

Auteur : Grafiati
Publié le 14 mars 2023

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Articles de revues sur le sujet "Bosonic binary mixture"

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MAMEDOV, T. A., et M. DE LLANO. « DC RESISTIVITY OF CHARGED COOPER PAIRS IN A SIMPLE BOSON-FERMION MODEL OF SUPERCONDUCTORS ». International Journal of Modern Physics B 22, no 25n26 (20 octobre 2008) : 4386–97. http://dx.doi.org/10.1142/s0217979208050140.

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An analytic expression for the contribution σB(λ, T) to the conductivity from charged bosonic Cooper pairs (CPs) is derived via two-time Green function techniques as a function of the BCS interelectron interaction model parameter λ and temperature T. Within the framework of a binary boson-fermion gas mixture model, it is shown that a self-consistent description of the resistivity data observed in high-temperature superconductors is possible only by assuming the presence of a finite gap between the energy spectra of free fermions and bosonic CPs.
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Penna, Vittorio, Alessandra Contestabile et Andrea Richaud. « Ground-State Properties and Phase Separation of Binary Mixtures in Mesoscopic Ring Lattices ». Entropy 23, no 7 (28 juin 2021) : 821. http://dx.doi.org/10.3390/e23070821.

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We investigated the spatial phase separation of the two components forming a bosonic mixture distributed in a four-well lattice with a ring geometry. We studied the ground state of this system, described by means of a binary Bose–Hubbard Hamiltonian, by implementing a well-known coherent-state picture which allowed us to find the semi-classical equations determining the distribution of boson components in the ring lattice. Their fully analytic solutions, in the limit of large boson numbers, provide the boson populations at each well as a function of the interspecies interaction and of other significant model parameters, while allowing to reconstruct the non-trivial architecture of the ground-state four-well phase diagram. The comparison with the L-well (L=2,3) phase diagrams highlights how increasing the number of wells considerably modifies the phase diagram structure and the transition mechanism from the full-mixing to the full-demixing phase controlled by the interspecies interaction. Despite the fact that the phase diagrams for L=2,3,4 share various general properties, we show that, unlike attractive binary mixtures, repulsive mixtures do not feature a transition mechanism which can be extended to an arbitrary lattice of size L.
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MAMEDOV, T. A., et M. DE LLANO. « GENERALIZED SUPERCONDUCTING GAP IN A BOSON-FERMION MODEL ». International Journal of Modern Physics B 24, no 25n26 (20 octobre 2010) : 5202–10. http://dx.doi.org/10.1142/s021797921005733x.

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A quantum-statistical binary gas mixture model consisting of positive-energy resonant bosonic Cooper electron pairs in chemical and thermal equilibrium with single unpaired electrons yields, via two-time retarded Green functions, an analytic expression for a dimensionless coupling λ- and temperature T-dependent generalized energy gap Eg(λ, T) in the single-electron spectrum. The new gap gives a reasonable description of overdoped Bi2Sr2CuO6+δ(Bi2201).
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Richaud, Andrea, et Vittorio Penna. « Quantum-Granularity Effect in the Formation of Supermixed Solitons in Ring Lattices ». Condensed Matter 5, no 1 (8 janvier 2020) : 2. http://dx.doi.org/10.3390/condmat5010002.

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We investigate a notable class of states peculiar to a bosonic binary mixture featuring repulsive intraspecies and attractive interspecies couplings. We evidence that, for small values of the hopping amplitudes, one can access particular regimes marked by the fact that the interwell boson transfer occurs in a jerky fashion. This property is shown to be responsible for the emergence of a staircase-like structure in the phase diagram of a mixture confined in a ring trimer and to resemble the mechanism of the superfluid-Mott insulator transition strongly. Under certain conditions, in fact, we show that it is possible to interpret the interspecies attraction as an effective chemical potential and the supermixed soliton as an effective particle reservoir. Our investigation is developed both within a fully quantum approach based on the analysis of several quantum indicators and by means of a simple analytical approximation scheme capable of capturing the essential features of this ultraquantum effect.
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SHARMA, R., et S. MUKHERJEE. « HER X-1 : A QUARK–DIQUARK STAR ? » Modern Physics Letters A 16, no 16 (30 mai 2001) : 1049–59. http://dx.doi.org/10.1142/s0217732301004108.

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Using a general solution to the Vaidya–Tikekar model for a spherically symmetric superdense star, we show that the equation of state (EOS) of a star with values of mass and radius within the experimental ranges for Her X-1 (a compact X-ray binary pulsar), agrees accurately with the EOS obtained by Horvath et al.,1 who considered a quark–diquark mixture in equilibrium. Nevertheless, we note that the boundary condition chosen for bosonic (diquark) component in Ref. 1 is not appropriate and the identification of Her X-1 as a quark–diquark star remains inconclusive.
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Souza, Valéria de C., Zochil González Arenas, Daniel G. Barci et Cesar A. Linhares. « Bosonic binary mixtures with Josephson-type interactions ». Physica A : Statistical Mechanics and its Applications 450 (mai 2016) : 134–47. http://dx.doi.org/10.1016/j.physa.2015.12.146.

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MAMEDOV, T. A., et M. DE LLANO. « UNIFORM COULOMB FIELD AS ORIGIN OF "FERMI ARCS" IN AN ANISOTROPIC BOSON-FERMION GAS MIXTURE ». International Journal of Modern Physics B 27, no 29 (5 novembre 2013) : 1347002. http://dx.doi.org/10.1142/s0217979213470024.

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A recent boson-fermion (BF) binary gas mixture model is extended to include: (i) anisotropy of the BF interaction and (ii) momentum-independent Coulomb repulsions. It is applied to account for the peculiarities of the pseudogap observed as function of absolute temperature T and concentration x of holes doped onto the CuO 2 planes and to study the further transformation of the pseudogap into the real superconducting gap, as T is lowered. Using two-time Green functions it is shown that pair breakings depend on the separation between the boson and fermion spectra of the BF mixture. As this separation shrinks, the pair-breaking ability of the Coulomb interaction weakens and disappears at the BEC Tc, i.e., at the T below which a complete softening of bosons occurs. Simultaneous inclusion of both effects (i) and (ii) produces, as T is lowered, "islands" in momentum space of incoherent Cooper pairs above the Fermi sea. These islands grow upon further cooling and merge together just before Tc is reached. The new extended BF model predicts a pseudogap phase in 2D high-Tc superconductors with lines of points, or loci, on the Fermi surface along which the pseudogap vanishes. This explains the origin of T-dependent "Fermi arcs" observed in ARPES experiments.
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Casas, M., N. J. Davidson, M. de Llano, T. A. Mamedov, A. Puente, R. M. Quick, A. Rigo et M. A. Solı́s. « Statistical model of superconductivity in a 2D binary boson–fermion mixture ». Physica A : Statistical Mechanics and its Applications 295, no 3-4 (juin 2001) : 425–40. http://dx.doi.org/10.1016/s0378-4371(01)00139-x.

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Ortolano, Giuseppe, Elena Losero, Stefano Pirandola, Marco Genovese et Ivano Ruo-Berchera. « Experimental quantum reading with photon counting ». Science Advances 7, no 4 (janvier 2021) : eabc7796. http://dx.doi.org/10.1126/sciadv.abc7796.

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The final goal of quantum hypothesis testing is to achieve quantum advantage over all possible classical strategies. In the protocol of quantum reading, this is achieved for information retrieval from an optical memory, whose generic cell stores a bit of information in two possible lossy channels. We show, theoretically and experimentally, that quantum advantage is obtained by practical photon-counting measurements combined with a simple maximum-likelihood decision. In particular, we show that this receiver combined with an entangled two-mode squeezed vacuum source is able to outperform any strategy based on statistical mixtures of coherent states for the same mean number of input photons. Our experimental findings demonstrate that quantum entanglement and simple optics are able to enhance the readout of digital data, paving the way to real applications of quantum reading and with potential applications for any other model that is based on the binary discrimination of bosonic loss.
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Mujal, Pere, Bruno Juliá-Díaz et Artur Polls. « Quantum properties of a binary bosonic mixture in a double well ». Physical Review A 93, no 4 (21 avril 2016). http://dx.doi.org/10.1103/physreva.93.043619.

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Thèses sur le sujet "Bosonic binary mixture"

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TRAMONTO, FILIPPO. « MICROSCOPIC STUDIES OF STATIC AND DYNAMIC PROPERTIES IN QUANTUM LIQUIDS AND GASES ». Doctoral thesis, Università degli Studi di Milano, 2015. http://hdl.handle.net/2434/260418.

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In this thesis I present studies of a number of quantum many-body Bose systems via Quantum Monte Carlo methods. We investigated the dynamic structure factor of a hard-sphere Bose system simulated at T=0 at different densities, from the dilute to the strongly interacting regimes. By increasing the density we observed the spectrum evolves from the weakly interacting Bogoliubov to a phonon-maxon-roton dispersion, but also the emergence of a broad multi-quasiparticle component. For a system with sphere radius and density corresponding to superfluid 4He at equilibrium, we found good agreement with the spectrum in the roton region. In another work, a liquid of distinguishable 4He atoms near freezing at T=1 K was studied to compute the equation of state and static density response function. The results of this study have been used to improve the description of the superfluid-to-solid transition within the Density Functional Theory. Measurements of crystallization kinetics in supercooled liquid p-H2--o-D2 mixtures showed a slowdown with respect to the pure counterparts. In order to contribute to the interpretation of these results we simulated these metastable mixtures. We found differences in the quantum delocalization of the two isotopic molecules, which result in different effective sizes. We characterized also the differences in the local order around the molecules of each species. These results revealed that the observed slowdown is due to purely quantum effects. Finally, in a QMC study of ion Ar+ doped 4He nanodroplets at T=1 K, we computed density profiles, energies, and investigated local order around the Ar+ ion. We found stable solid structures around the ion composed of three solvation shells having the shape of platonic solids: an icosahedron, a dodecahedron, and, again, an icosahedron, with 12, 20, and 12 4He atoms, going from the inner to the outer shell respectively. These results confirmed the interpretation of experimental measurements of the abundances of Ar+@4He nanodroplets.
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Frese, Daniel [Verfasser]. « Bose-Einstein condensation of rubidium : ultracold binary bosonic mixtures / vorgelegt von Daniel Frese ». 2005. http://d-nb.info/977555577/34.

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