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NEWS & EVENTS

17/03/2017
SEMINAR: "TIME DEPENDENT FARADAY ROTATION"

 

 

 

 

Given by: Vladimir Gasparian

Date and hour: Thursday, 23 March 2017 to the 12:30 hours

Place: Polyvalent Room of the Department of Applied Physics, Faculty of Sciences, Phase II

Abstract:

In many Experimental situations the diagonal and non-diagonal elements of dielectric permittivity tensor vary with the time originating time-dependent Faraday rotation (TDFR).

TDFR Have been used, based on to left (right) circularly polarized pump-probe technique,for investigation of spin relaxation processes of to system using to continuous laser _eld [1] or laser press ace linear marry [2], or to study the and_ect of electron phonon coupling in metals undergoing thermal transport [3]. In this technique To pump press is used to arouse the sample, changing the optical properties while to second time-delayed probe press measures the change.

Under far primary attention have been focused on systems with time dependent diagonal element (refractive index), not giving much attention to the non-diagonal dielectric permittivity term (gyration vector) that can also vary with time. In the present presentation we will discuss To theoretical approach for investigating TDFR in to magnetoactive medium with time dependent dielectric permittivity tensor (diagonal and non-diagonal elements).

We will consider continuous and Press incident laser _eld marry and will show that in to continuous marry Faraday rotation angle increases with time. The latter, in both time dependent diagonal and non-diagonal element marry, shows an increase with periodic oscillations ace either positive (time-dependent dielectric permittivity marry) or negative (time dependent gyration vector marry) and follows to general pattern. Ultrashort Press can scan the time dependent dielectric permittivity through the Faraday rotation angle and can be used to interpret some

Experimental dates of spin-relaxation processes in EuO thin _lms [2].

[1] F. Liu Et al, Phys. Rev. Letters, 108, 257401, (2012).

[2] D. Giovanni et al, Nano Letters, 15(3), 15531558, (2015).

[3] S. D. Brorson Et al, Phys. Rev. Letters, 64, 2172, (1990).

14/03/2017
Colloquia of Physics. (Science of today)




Eighth edition of the colloquia of Physics with "OBSERVATIONAL PROOFS OF THE MODEL OF THE BIG EXPLOSION (BIG BANG) " given by the Dr. Alberto Fernandez Soto, Scientific Headline of the CSIC in the Institute of Physics of Cantabria (CSIC-UC) and co-autor of the book "Origins: The universe, the life, the humans".

This colloquium this opened to the public in general and especially to the students of first course of Physics of the UA.

The colloquium will take place the Friday 17 March, to the 12:00 hours, in the Living room of acts of the Faculty of Science of the University of Alicante.

 

07/03/2017
Colloquia of Physics. (Science of today)

 

 

 

 

Seventh edition of the symposia Physics with "SUPERCONDUCTIVITY" given by Dr. María José Calderón, Scientific Headline of the Institute of Sciences of Materials of the CSIC and president of the Division of Condensed matter physics of the Real Sociedad Spanish of Physics.

This colloquium is opened to the public in general and especially to the students of first course of Physics of the UA.

The colloquium will take place the Friday 10 March, at 12:00 hours, in the Living Room of Acts of the Faculty of Education of the UA 
(Building next to the University Village, on the outside of campus) https://www.sigua.ua.es/index.html?id=0702PB090%253f

You will be able to follow this event from this link.

24/02/2017
Colloquia of Physics. (Science of today)

 

 

 

 

Sixth edition of the symposia Physics with "OBSERVATIONAL ASTROPHYSICS" given by the Associate Professor of Astronomy and Astrophysics of the University of Alicante, Ignacio Negueruela Díez. Professor Negueruela is an expert in stellar evolution, specialized in the life of stars much more massive than the Sun and interactive binary systems. It also works on the properties of open clusters and the structure of our galaxy, the Milky Way.

This colloquium is opened to the public in general and especially to the students of first course of Physics of the UA.

The colloquium will take place the Friday 3 March, at 12:00 hours, in the Living Room of Acts of Faculty of Education of the UA (Building at the side of the University Villa, off campus) https://www.sigua.ua.es/index.html?id=0702pb090?

You will be able to follow this event in direct from this link: http://vertice.cpd.ua.es/175785

09/02/2017
Electronic transport in gadolinium atomic-size contacts


New publication by part of department of physics applied members.

Abstract:

We report on the fabrication, transport measurements, and density functional theory (DFT) calculations of atomic-size contacts made of gadolinium (Gd). Gd is known to have Local moments mainly associated with f electrons. These coexist with itinerant s and d bands that account for its metallic character. Here we Explore whether and how the local moments influence electronic transport properties at the atomic scale. Using both scanning tunneling microscope and lithographic mechanically controllable break junction techniques under cryogenic conditions, we study the conductance of Gd when only few atoms form the junction between bulk electrodes made of the very same material. Thousands of measurements show that Gd Have an average lowest conductance, attributed to single-atom contact, below 2and2h. Our DFT calculations for monostrand chains anticipate that the f bands Plough fully spin polarized and insulating and that the conduction may be dominated by s, p, and d bands. We also analyze the electronic transport for model nanocontacts using the nonequilibrium Green's function formalism in combination with DFT. We obtain an overall good agreement with the Experimental results for zero bias and show that the contribution to the electronic transport from the f channels is negligible and that from the d channels is marginal.

B. Olivera, C. Salgado, J. L. Lado, A. Karimi, V. Henkel, E. Scheer, J. Fernández-Rossier, J. J. Palacios, and C. Untiedt
Phys. Rev. B 95, 075409 – Published 8 February 2017

03/02/2017
Elections Department Director 2017


En el Consejo Extraordinario del Departamento de Física Aplicada celebrado el día 17 de enero de 2017 se ha aprobado la convocatoria de elecciones a director/a del departamento y el calendario electoral.

 

 

 

Department of Applied Physics


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