Latest Research Papers In Condensed Matter Physics | (Cond-Mat.Stat-Mech) 2019-05-26
Statistical Mechanics
Can three-body recombination purify a quantum gas? (1905.09811v1)
Lena H. Dogra, Jake A. P. Glidden, Timon A. Hilker, Christoph Eigen, Eric A. Cornell, Robert P. Smith, Zoran Hadzibabic
2019-05-23
Three-body recombination in quantum gases is traditionally associated with heating, but it was recently found that it can also cool the gas. We show that in a partially condensed three-dimensional homogeneous Bose gas three-body loss could even purify the sample, that is, reduce the entropy per particle and increase the condensed fraction
. We predict that the evolution of
Multiple Exclusion Statistics: the 
-mers problem (1905.09277v1)
-mers problemJulián J. Riccardo
2019-05-23
A new distribution for systems of particles obeying statistical exclusion of correlated states is presented following the Haldane's state counting. It relies upon a conjecture to deal with the multiple exclusion that takes place when the states available to single particles are spatially correlated and it can be simultaneously excluded by more than one particle. The Haldane's statistics [F. D. M. Haldane, Phys. Rev. Lett. 67, 937 (1991)] and Wu's distribution [Y.-S. Wu, Phys. Rev. Lett. 52, 2103 (1984)] are recovered in the limit of non-correlated states (constant statistical exclusion) of the multiple exclusion statistics. In addition, the exclusion spectrum function
is introduced to account for the dependence of the statistical exclusion on the occupation-number
. Results of thermodynamics and state occupation are shown for ideal lattice gases of linear particles of size
to
where multiple exclusion dominates as
Fixation in Fluctuating Populations (1901.08229v3)
Deepak Bhat, Jordi Piñero, S. Redner
2019-01-24
We investigate the dynamics of the voter model in which the population itself changes endogenously via the birth-death process. There are two species of voters, labeled A and B, and the population of each species can grow or shrink by the birth-death process at equal rates
. Individuals of opposite species also undergo voter model dynamics in which an AB pair can equiprobably become AA or BB with rate
---neutral evolution. In the limit
, the distribution of consensus times varies as
and the probability that the population size equals
. As the birth/death rate
Exclusion in Junction Geometries (1904.00541v3)
K. Zhang, P. L. Krapivsky, S. Redner
2019-04-01
We investigate the dynamics of the asymmetric exclusion process at a junction. When two input roads are initially fully occupied and a single output road is initially empty, the ensuing rarefaction wave has a rich spatial structure. The density profile also changes dramatically as the initial densities are varied. Related phenomenology arises when one road feeds into two. Finally, we determine the phase diagram of the open system, where particles are fed into two roads at rate
for each road, the two roads merge into one, and particles are extracted from the single output road at rate
.
Electronic hydrodynamics in graphene (1905.09686v1)
Boris N. Narozhny
2019-05-23
In this paper I report a pedagogical derivation of the unconventional electronic hydrodynamics in graphene on the basis of the kinetic theory. While formally valid in the weak coupling limit, this approach allows one to derive the unconventional hydrodynamics in the system which is neither Galilean- nor Lorentz-invariant, such that hydrodynamic equations can not be inferred from symmetry arguments. I generalize earlier work to include external magnetic fields and give explicit expressions for dissipative coefficients, the shear viscosity and electrical conductivity. I also compare the resulting theory with relativistic hydrodynamics.
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