Pumped double quantum dot with spin-orbit coupling

We study driven by an external electric field quantum orbital and spin dynamics of electron in a one-dimensional double quantum dot with spin-orbit coupling. Two types of external perturbation are considered: a periodic field at the Zeeman frequency and a single half-period pulse. Spin-orbit coupling leads to a nontrivial evolution in the spin and orbital channels and to a strongly spin-dependent probability density distribution. Both the interdot tunneling and the driven motion contribute into the spin evolution. These results can be important for the design of the spin manipulation schemes in semiconductor nanostructures.

EAE eta Irlanda, Hezkuntza Bereziaren bi ikuspegi

Aniztasun funtzionala duten pertsonen hezkuntzaren inguruko GALa da hau. Hezkuntzak arlo honetan izan duen ibilbidea ezagutu ostean, EAE eta Irlandako hezkuntza sistemak aztertzen dituena. Ikerketa lana da hau eta gaiaren inguruko azterketa bibliografiko sakona izateaz gain bi herrialdeetan datu bilketa egin izan da, bi herrialdeetako irakasleak betetako galdetegien bitartez. Tresna hauen helburua batzuen zein besteen jarrerak ezagutzea eta konparatzea zen, hauen garrantziaz jabetuz. Ikerketa lanaren ostean bi herrialdeek heziketa berezia ulertzeko bi modu desberdin dituztela azaleratzen da: EAEn integraziotik inklusiora bidean gauden bitartean, Irlandan kontraesan ugari daude; izan ere, inklusioa bultzatu nahi da, baina eskola bereziak mantenduz. Irlandan badute zer aldatu, baina bertan ere badugu. Inklusioa da jarraitu beharreko bidea; ez da erraza izango, baina aniztasun funtzionala duten haurrekin elkar bizitzea aukera bat da eta guztiok izan gaitezke irabazle.

Depresio handia eta 2008ko Krisia. AEBko bi krisi nagusiak

Comparación entre la gran depresión y la crisis de 2008

Self-Organized Criticality, Plasticity and Sensorimotor Coupling. Explorations with a Neurorobotic Model in a Behavioural Preference Task

During the last two decades, analysis of 1/f noise in cognitive science has led to a considerable progress in the way we understand the organization of our mental life. However, there is still a lack of specific models providing explanations of how 1/f noise is generated in coupled brain-body-environment systems, since existing models and experiments typically target either externally observable behaviour or isolated neuronal systems but do not address the interplay between neuronal mechanisms and sensorimotor dynamics. We present a conceptual model of a minimal neurorobotic agent solving a behavioural task that makes it possible to relate mechanistic (neurodynamic) and behavioural levels of description. The model consists of a simulated robot controlled by a network of Kuramoto oscillators with homeostatic plasticity and the ability to develop behavioural preferences mediated by sensorimotor patterns. With only three oscillators, this simple model displays self-organized criticality in the form of robust 1/f noise and a wide multifractal spectrum. We show that the emergence of self-organized criticality and 1/f noise in our model is the result of three simultaneous conditions: a) non-linear interaction dynamics capable of generating stable collective patterns, b) internal plastic mechanisms modulating the sensorimotor flows, and c) strong sensorimotor coupling with the environment that induces transient metastable neurodynamic regimes. We carry out a number of experiments to show that both synaptic plasticity and strong sensorimotor coupling play a necessary role, as constituents of self-organized criticality, in the generation of 1/f noise. The experiments also shown to be useful to test the robustness of 1/f scaling comparing the results of different techniques. We finally discuss the role of conceptual models as mediators between nomothetic and mechanistic models and how they can inform future experimental research where self-organized critically includes sensorimotor coupling among the essential interaction-dominant process giving rise to 1/f noise.

Diseño del sistema de tensor de cadena y acople de pinza de freno trasero para moto de competición.

[ES]En este documento se propone el diseño de dos sistemas imprescindibles en el tren trasero de una moto de competición, el sistema de tensor de cadena y el del acople de pinza de freno trasero. Junto a estos sistemas se diseñará, dada su relevancia, el basculante de la moto. Estos diseños se realizarán de tal manera que cumplan una serie de requisitos geométricos y de resistencia, garantizando en todo momento la estabilidad y seguridad del piloto. Se realizará también el estudio de la fabricación de cada uno de los elementos que componen los sistemas, con el fin de realizar diseños viables, que resulten económicamente factibles y mantengan un alto grado de calidad. En el proyecto se analizarán las diferentes alternativas de los sistemas que se puedan adoptar, sus ventajas y desventajas, para así poder escoger, con un alto grado de seguridad, la opción que mejor cumpla los objetivos y condiciones establecidos. Cabe destacar que este proyecto se encuentra dentro de otro de mayor envergadura consistente en el diseño y la fabricación de una motocicleta de competición para participar en el campeonato internacional llamado “MotoStudent”. Esta competición se realiza entre universidades de todo el mundo y en ella los equipos de estudiantes se enfrentan al desafío de diseñar y desarrollar un prototipo de motocicleta de competición similar a la categoría mundialista de “Moto3”.

Haches, diptongos y otros detalles de alguna importancia: notas sobre numerales (proto)vascos y comparación vasco-ibérica (con un apéndice sobre 'hiri' y otro sobre 'bat'-'bi')

Trabajo desarrollado dentro del proyecto Monumenta Linguae Vasconum III (FFI2008-04516) del MICIN y del GIC: IT-486-10 del GV.

Indoor air treatment by coupling biofiltration and adsortion

225 p.

New generation of two-dimensional spintronic systems realized by coupling of Rashba and Dirac fermions

Intriguing phenomena and novel physics predicted for two-dimensional (2D) systems formed by electrons in Dirac or Rashba states motivate an active search for new materials or combinations of the already revealed ones. Being very promising ingredients in themselves, interplaying Dirac and Rashba systems can provide a base for next generation of spintronics devices, to a considerable extent, by mixing their striking properties or by improving technically significant characteristics of each other. Here, we demonstrate that in BiTeI@PbSb2Te4 composed of a BiTeI trilayer on top of the topological insulator (TI) PbSb2Te4 weakly- and strongly-coupled Dirac-Rashba hybrid systems are realized. The coupling strength depends on both interface hexagonal stacking and trilayer-stacking order. The weakly-coupled system can serve as a prototype to examine, e.g., plasmonic excitations, frictional drag, spin-polarized transport, and charge-spin separation effect in multilayer helical metals. In the strongly-coupled regime, within similar to 100 meV energy interval of the bulk TI projected bandgap a helical state substituting for the TI surface state appears. This new state is characterized by a larger momentum, similar velocity, and strong localization within BiTeI. We anticipate that our findings pave the way for designing a new type of spintronics devices based on Rashba-Dirac coupled systems.

Parity-dependent State Engineering and Tomography in the ultrastrong coupling regime

Reaching the strong coupling regime of light-matter interaction has led to an impressive development in fundamental quantum physics and applications to quantum information processing. Latests advances in different quantum technologies, like superconducting circuits or semiconductor quantum wells, show that the ultrastrong coupling regime (USC) can also be achieved, where novel physical phenomena and potential computational benefits have been predicted. Nevertheless, the lack of effective decoupling mechanism in this regime has so far hindered control and measurement processes. Here, we propose a method based on parity symmetry conservation that allows for the generation and reconstruction of arbitrary states in the ultrastrong coupling regime of light-matter interactions. Our protocol requires minimal external resources by making use of the coupling between the USC system and an ancillary two-level quantum system.

Acipenser generoko bi espezieren ekoizpenaren faktore mugatzaileak kultiboan

[EUS] Gaizkaten kultiboa gero eta garrantzitsuagoa da akuikulturan. Jarduera honen ondorioz lortzen den ekoizkin primarioa, hau da, kabiarra, gero eta gehiago ari da ekoizten eta kontsumitzen. Honek, hazkunde-prozesuan dagoen jarduera ekonomikoa bihurtzen du azipentserikultura. Gaizkata eme bakoitzak ekoizten duen arrautza-kopurua, hau da, kabiar kopurua, animaliaren tamaina eta egoerarekin dago erlazionatuta zuzenean, beraz, etekin ekonomikoa ere, erlazionatuta egongo da honekin. Hau honela, guztiz garrantzizkoa izango da ekoizpena murriztuko duten faktoreen identifikazioa.

Scalable quantum memory in the ultrastrong coupling regime

Circuit quantum electrodynamics, consisting of superconducting artificial atoms coupled to on-chip resonators, represents a prime candidate to implement the scalable quantum computing architecture because of the presence of good tunability and controllability. Furthermore, recent advances have pushed the technology towards the ultrastrong coupling regime of light-matter interaction, where the qubit-resonator coupling strength reaches a considerable fraction of the resonator frequency. Here, we propose a qubit-resonator system operating in that regime, as a quantum memory device and study the storage and retrieval of quantum information in and from the Z(2) parity-protected quantum memory, within experimentally feasible schemes. We are also convinced that our proposal might pave a way to realize a scalable quantum random-access memory due to its fast storage and readout performances.