Seminário con el prof. Prof. Heinz von Seggern – Colour-tuneable organic light-emitting transistors – 13 de septiembre de 2013 – 10:00

09/09/2013 08:24

EL PROGRAMA DE POSGRADO EN FÍSICA invita a todos para lo seminario: 

Colour-tuneable organic light-emitting transistors 

Prof. Heinz von Seggern

Electronic Materials, Technische Universität Darmstadt, 64287 Darmstadt, Germany. 

Resumen: 

The unique property of ambipolar organic light emitting field-effect transistors (OLETs) is the ability to position the light emission zone within the transistor channel through the applied biases. In this talk the basics of the ambipolar OLET will be discussed and two examples for colour conversion will be demonstrated. Both approaches take advantage of the ability of a controlled displacement of the recombination zone through the organic semiconductors. In the first approach two different acenes with different emission colours are employed in a parallel stack in a top-contact bottom-gate FET configuration. It will be demonstrated that due to thermionic emission of electrons at the source, light of one colour can be generated near the source contact even in hole accumulation. Due to the electrically controllable positioning the charge carrier recombination zone can be directed from the top acene layer to in the bottom acene layer. Thereby the emitted light can be continuously shifted by about 50 nm from green to red. A second approach takes advantage of the horizontal displacement of the recombination zone within the channel of the transistor. On top of the semi-transparent gate electrode of a F8BT transistor a colour conversion layer is deposited in a wedge-like shape partially covering the channel. In the ambipolar regime the charge carrier recombination takes place in the F8BT layer, and dependent on the position of the recombination zone either the emitted light of the F8BT layer or the partially absorbed and converted light from the colour conversion layer can be detected. The electroluminescence maximum of the emitted light can be shifted by about 30 nm. The physics and potential applications of such colour tuneable OLETs will be discussed. 

Fecha: 13 de septiembre de 2013 – (Viernes) – Lugar: Auditorio del bloque G – Sala 419 – Horário: 10:00

Seminário con el prof. Prof. Norberto Scoccola – Quark matter under strong magnetic fields – 6 de septiembre de 2013 – 10:00

04/09/2013 10:01

EL PROGRAMA DE POSGRADO EN FÍSICA invita a todos para lo seminario:

Quark matter under strong magnetic fields 

Prof. Norberto Scoccola / Depto. de Fisica, Lab. TANDAR – Argentina

Resumen:

The phase structure of magnetized cold quark matter is analyzed in the framework of the two-flavor Nambu-Jona-Lasinio models paying special attention to its dependence on the model parameters as different values within the phenomenological allowed range are consid- ered. We first discuss the simpler chiral limit case, and then the more realistic situation of finite current masses. We show that in spite of the difference in the nature of some transi- tions, both cases are alike and exhibit a rather rich phase structure for a significant range of acceptable parameters. A simplification of the phase structure is obtained as parameters leading to larger values of the dressed quark mass in the vacuum are considered. Finally, we consider the so-called “inverse catalysis effect” showing that in some phases it implies an actual decrease of the order parameter as the magnetic field increases.

 

Fecha: 6 de septiembre de 2013 – (Viernes) – Lugar: Auditorio del bloque G – Sala 419 – Horário: 10:00

 

Examen de Cualificación al Doctorado de Luiz Laércio Lopes – 6 de septiembre de 2013 – Viernes – 2:00 pm

01/09/2013 08:00

El Programa de Posgrado en Física invita a todos para: 

Examen de Cualificación al Doctorado 

Luiz Laércio Lopes 

Estrelas de Nêutrons no Regime da Simetria SU(3) 

Jurados 

Prof. Dr. Marcus Emmanuel Benghi Pinto – (Presidente) – FSC/UFSC

Prof. Dr. Norberto N. Scoccola – (Miembro externo) – Depto de Física – Lab. TANDAR

Prof. Dr. Sidney dos Santos Avancini – (Miembro titular) – FSC/UFSC

Fecha: 6 de septiembre de 2013- sexta-feira – Horario: 2:00 pm -Lugar: Auditorio del bloque G – Sala 419

Sustentación de Tesis de de Iuri Stefani Brandt – 2 de septiembre 2013 – Lunes – Horario: 2:00 pm

28/08/2013 08:19

El programa de Posgrado en Fisica invita a todos para la: 

Sustentación de Tesis 

Iuri Stefani Brandt 

PROPRIEDADES RELACIONADAS ÀS VACÂNCIAS DE Cu EM FILMES ELETRODEPOSITADOS DE Cu2O E EMISSÃO DE PARES PÓSITRON-ELÉTRON CORRELACIONADOS DE SUPERFÍCIES 

Jurados:

Prof. Dr. André Avelino Pasa – (Presidente) – FSC/UFSC

Prof. Dr. Marcelo Knobel – (Miembro externo) – UNICAMP

Prof. Dr. Jandir Miguel Hickmann – (Miembro externo) – UFRGS

Prof. Dr. Alexandre da Cas Viegas – (Membro titular) – FSC/UFSC

Prof. Dr. Márcio Santos – (Miembro titular) – FSC/UFSC

Dr. Vinicius Claudio Zoldan – (Miembro titular) – FSC/UFSC

Dr. Jonathan Israel Avila Osses – (Miembro suplente) -FSC/UFSC

Dr. Mohmmad Khalid – (Miembro suplente) – FSC/UFSC

Fecha: 2 de septiembre 2013 – Lunes – Horario: 2:00 pm – Lugar: Auditorio del bloque G – Sala 419

Examen de Cualificación al Doctorado de Rodrigo Pereira Rocha – 30 de agosto de 2013 – Viernes – 10:00 am

25/08/2013 08:33

El Programa de Posgrado en Física invita a todos para: 

Examen de Cualificación al Doctorado 

Rodrigo Pereira Rocha 

Difusão e Localização em Sistemas Desordenados Descritas por uma Equação Mestra Estocástica 

Jurados 

Prof. Dr. Wagner Figueiredo – (Presidente) – FSC/UFSC

Prof. Dr. Mario Jose de Oliveira – (Miembro externo) – IF/USP

Prof. Dr. Nilton da Silva Branco – (Miembro titular) – FSC/UFSC

Prof. Dr. Jeferson de Lima Tomazelli – (Miembro titular) – FSC/UFSC

Fecha: 30 de agosto de 2013- sexta-feira – Horario: 10:00 am -Lugar: Sala de Reuniones del bloque G – Sala 11

Seminário con el prof. Narciso Benitez Lozano – J-PAS: The Javalambre-Physics of the Accelerated Universe Astrophysical Survey – 10:00

25/08/2013 08:00

EL PROGRAMA DE POSGRADO EN FÍSICA invita a todos para lo seminario:

J-PAS: The Javalambre-Physics of the Accelerated Universe Astrophysical Survey

Narciso Benitez Lozano

 Instituto de Astrofísica de Andalucía (CSIC)

Resumen:

The Javalambre-Physics of the Accelerated Universe Astrophysical Survey (J-PAS) is a very wide field Cosmological Survey to be carried out from the Javalambre Observatory in Spain with a purpose-built, dedicated 2.5m telescope, using a set of 54 narrow band and 5 broad band filters over a 1.2Gpix, 4.7deg2 camera. Starting in 2015, J-PAS will image 8500deg2 of Northern Sky and obtain 0.003(1 + z) precision photometric redshifts for 9 × 107 galaxies, about 50 times more than the largest current spectroscopic survey, sampling an effective volume of ∼ 14 Gpc3. In addition J-PAS will also carry out a SNIe survey, a cosmic shear survey (thanks to the superb seeing at Javalambre) and a cluster survey, exploring the four main Dark Energy probes. In fact, and thanks to its innovative design, J-PAS will be the first experiment capable of  reaching Stage IV according to the Dark Energy Task Force classification, several years before other projects like Euclid or LSST start their operations. The instrumental development of this project involves a small fraction of the cost and complexity of a high multiplexing spectrograph, yet it will produce data which enable a much wider range of Astrophysical applications: J-PAS effectively uses a 4.7deg2 “IFU” which will produce a low resolution 3D image of the Extragalactic Northern sky. Our survey will have a lasting legacy value, serving as a fundamental dataset for future cosmological projects.

 

Fecha: 30 de agosto de 2013 – (Viernes) – Lugar: Auditorio del bloque G – Sala 419 – Horário: 10:00 

Sustentación de Disertación de Graziâni Candiotto – 28 de agosto de 2013 – 10:00 am

23/08/2013 08:42

El programa de Posgrado en Física invita a todos para la:

Sustentación de Disertación 

Graziâni Candiotto 

Método potenciodinâmico aplicado ao estudo da difusão iônica limitada por camada porosa em substratos de ITO

Jurados

Profª. Drª. Maria Luisa Sartorelli – (Presidente) – FSC/UFSC

Prof. Dr. Lucas Fugikawa Santos – (Miembro externo) – Unesp – São José do Rio Preto

Prof. Dr. Osvaldo Frederico Schilling Neto – (Miembro titular) -FSC/UFSC

Profª. Drª. Marta Elisa Rosso Dotto – (Miembro titular) – FSC/UFSC

Fecha: 28 de agosto de 2013 – Miércoles – Horario: 10:00 am – Lugar: Auditorio del bloque G – Sala 419

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