Física de la Matèria Condensada: Recent submissions
Now showing items 321-340 of 1286
Comment on "Canonical formalism for Lagrangians with nonlocality of finite extent"
The paper by Woodward [Phys. Rev. A 62, 052105 (2000)] claimed to have proved that Lagrangian theories with a nonlocality of finite extent are necessarily unstable. In this Comment we propose that this conclusion is false.
Describing synchronization and topological excitations in arrays of magnetic spin torque oscillators through the Kuramoto model
The collective dynamics in populations of magnetic spin torque oscillators (STO) is an intensely studied topic in modern magnetism. Here, we show that arrays of STO coupled via dipolar fields can be modeled using a variant ...
Giant barocaloric effect in all-d-metal Heusler shape memory alloys
We have studied the barocaloric properties associated with the martensitic transition of a shape memory Heusler alloy Ni50Mn31.5Ti18.5 which is composed of all-d-metal elements. The composition of the sample has been ...
The problem of physical coordinates in predictive Hamiltonian systems
In the Hamiltonian formulation of predictive relativistic systems, the canonical coordinates cannot be the physical positions. The relation between them is given by the individuality differential equations. However, due ...
Flocking-Enhanced social contagion
Populations of mobile agents animal groups, robot swarms, or crowds of people self-organize into a large diversity of states as a result of information exchanges with their surroundings. While in many situations of interest ...
Coherent Stranski-Krastanov growth in 1+1 dimensions with anharmonic interactions: An equilibrium study
The formation of coherently strained three-dimensional (3D) islands on top of the wetting layer in the Stranski-Krastanov mode of growth is considered in a model in 1 + 1 dimensions accounting for the anharmonicity and ...
Membrane-Assisted Viral DNA Ejection
Genome packaging and delivery are fundamental steps in the replication cycle of all viruses. Icosahedral viruses with linear double-stranded DNA (dsDNA) usually package their genome into a preformed, rigid procapsid using ...
Flexocaloric effect in superelastic materials
We present a combined theoretical-experimental study of flexocaloric effects in superelastic materials exhibiting structural transitions. We study a Ginzburg-Landau model combined with a vibrational model for a beam near ...
Cooperative force generation of KIF1A Brownian motors
KIF1A is a kinesin motor protein that can work processively in a monomeric (single-headed) form by using a noise-driven ratchet mechanism. Here, we show that the combination of a passive diffusive state and finite-time ...
Bistability driven by white shot noise
We consider mean-first-passage times and transition rates in bistable systems driven by white shot noise. We obtain closed analytical expressions, asymptotic approximations, and numerical simulations in two cases of interest: ...
Irreversible flow of vortex matter: polycrystal and amorphous phases
We investigate the microscopic mechanisms giving rise to plastic depinning and irreversible flow in vortex matter. The topology of the vortex array crucially determines the flow response of this system. To illustrate this ...
Exact gravitational shockwaves and Planckian scattering on branes
We obtain a solution describing a gravitational shock wave propagating along a Randall-Sundrum brane. The interest of such a solution is twofold: on the one hand, it is the first exact solution for a localized source on a ...
Recycling universe
If the effective cosmological constant is nonzero, our observable universe may enter a stage of exponential expansion. In such a case, regions of it may tunnel back to the false vacuum of an inflaton scalar field, and ...
Nonstationary Feller process with time-varying coefficients
We study the nonstationary Feller process with time varying coefficients. We obtain the exact probability distribution exemplified by its characteristic function and cumulants. In some particular cases we exactly invert ...
Directed random walk with random restarts: The Sisyphus random walk
In this paper we consider a particular version of the random walk with restarts: random reset events which suddenly bring the system to the starting value. We analyze its relevant statistical properties, like the transition ...
Twinned-domain-induced magnonic modes in epitaxial LSMO/STO films
The use of periodic magnetic structures to control the magneto-dynamic properties of materials-Magnonics-is a rapidly developing field. In the last decade, a number of studies have shown that metallic films can be patterned ...
Hysteretic control of organic conductance due to remanent magnetic fringe fields
Manipulation of the remanent (zero external magnetic field) magnetization state of a single ferromagnetic film is shown to control the room-temperature conductance of an organic semiconductor thin film deposited on top. ...
First-passage times for non-Markovian processes: Correlated impacts on a free process
We develop a method to obtain first-passage-time statistics for non-Markovian processes driven by dichotomous fluctuations. The fluctuations themselves need not be Markovian. We calculate analytic first-passage-time ...
Algebraic decay of velocity fluctuations near a wall
Computer simulations of the dynamics of a colloidal particle suspended in a fluid confined by an interface show that the asymptotic decay of the velocity correlation functions is algebraic. The exponents of the long-time ...
Fluidization and active thinning by molecular kinetics in active gels
We derive the constitutive equations of an active polar gel from a model for the dynamics of elastic molecules that link polar elements. Molecular binding kinetics induces the fluidization of the material, giving rise to ...
