1,863 research outputs found
Scale invariant distribution functions in quantum systems with few degrees of freedom
Scale invariance usually occurs in extended systems where correlation
functions decay algebraically in space and/or time. Here we introduce a new
type of scale invariance, occurring in the distribution functions of physical
observables. At equilibrium these functions decay over a typical scale set by
the temperature, but they can become scale invariant in a sudden quantum
quench. We exemplify this effect through the analysis of linear and non-linear
quantum oscillators. We find that their distribution functions generically
diverge logarithmically close to the stable points of the classical dynamics.
Our study opens the possibility to address integrability and its breaking in
distribution functions, with immediate applications to matter-wave
interferometers.Comment: 8+10 pages. Scipost Submissio
Non equilibrium phase transitions and Floquet Kibble-Zurek scaling
We study the slow crossing of non-equilibrium quantum phase transitions in
periodically-driven systems. We explicitly consider a spin chain with a uniform
time-dependent magnetic field and focus on the Floquet state that is
adiabatically connected to the ground state of the static model. We find that
this {\it Floquet ground state} undergoes a series of quantum phase transitions
characterized by a non-trivial topology. To dinamically probe these
transitions, we propose to start with a large driving frequency and slowly
decrease it as a function of time. Combining analytical and numerical methods,
we uncover a Kibble-Zurek scaling that persists in the presence of moderate
interactions. This scaling can be used to experimentally demonstrate
non-equilibrium transitions that cannot be otherwise observed.Comment: 7 pages, 3 figures, Supplemental Material. (In this last version, the
one published in EPL, we provide a better discussion of the Floquet adiabatic
theorem, the construction of the Floquet ground state as an adiabatic
continuation and the nature of the phase transitions.
Jóvenes trabajadores mendocinos : trayectorias laborales y su condicionante familiar
Fil: Dalla Torre, Julieta.
Consejo Nacional de Investigaciones Científicas y Técnica
Kultura katolicka i kino w latach 30. Na przykładzie L’Illustrazione Vaticana
This essay talks about the magazine L’Illustrazione Vaticana, edited by the newspaper L’Osservatore Romano during the Thirties. It’s an ad vanced magazine for that period and one of the field of his topics is cinema. From the pages of this magazine, the catholic culture stars to study cinema: analyzing it, criticizing it and encouraging it. It’s im portant to say that the attitude of catholic culture isn’t only a difensive attitude, but also a proactive. It’s in the Thirties that was born a first important catholic film critic.Artykuł omawia magazyn L’Illustrazione Vaticana, publikowany przez wydawców L’Osservatore Romano w latach trzydziestych XX w. W tamtym okresie był dobrze rozwiniętym periodykiem, którego jed nym z istotnych tematów było kino. Znaczące osobistości katolickiego życia kulturalnego na tych łamach dyskutowały, analizowały, krytyko wały i inspirowały dzieła filmowe. Trzeba zaznaczyć, że opieranie się na kulturze katolickiej nie było w żadnym razie jedynie formą kultu rowej obrony, była to także postawa proaktywna. W związku z tym, lata 30. XX w. jawią się jako dekada, która obrodziła pierwszą znaczą cą kinematograficzną krytykę katolicką
Computational Approach to Aluminum Biochemistry and Development of New Chelation Strategies
299 p.DIPC:Donostia International Physics Center
SmartLigs Bioinformatica
Universidade do Port
Complete characterization of spin chains with two Ising symmetries
Spin chains with two Ising symmetries are the Jordan-Wigner duals of
one-dimensional interacting fermions with particle-hole and time-reversal
symmetry. From earlier works on Majorana chains, it is known that this class of
models has 10 distinct topological phases. In this paper, we analyze the
physical properties of the correspondent 10 phases of the spin model. In
particular, thanks to a set of two non-commuting dualities, we determine the
local and non-local order parameters of the phases. We find that 4 phases are
topologically protected by the Ising symmetries, while the other 6 break at
least one symmetry. Our study highlights the non-trivial relation between the
topological classifications of interacting bosons and fermions.Comment: 7 page
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