THE PHYSICS GRADUATE PROGRAM invites everyone to the seminar: 

   Busca da Janela Conforme 

Tiago José Nunes da Silva – University of Groningen, RUG, Holanda

Abstract:

Teorias de Calibre Não-Abelianas com um grande número de sabores exibem restauração de simetria conforme antes que liberdade assintótica seja perdida. Um dos cenários que tenta explicar como simetria conforme é restaurada é o cenário da Janela Conforme. Neste seminário eu irei introduzir o tema e reportar resultados recentes obtidos utilizando métodos de teoria de calibre na rede, um método não-perturbativo robusto para o estudo numérico de teorias de calibre.

Date: 8/May/2015 – (friday) – Place: Sala 212 – Auditório do Departamento de Física– Time: 10h15min

THE PHYSICS GRADUATE PROGRAM invites everyone to the seminar: 

   Effect of singlet triplet recycling in the charge transfer state manifold and molecular geometry on thermally activated delayed fluorescence 

Prof. Andy P. Monkman

Dept. of Physics, Durham University, South Road Durham, UK

Abstract:

Figure 1: Temperature dependent delayed fluorescence measurements of a near zero exchange energy ICT TADF

Detailed photophysical measurements of intramolecular charge transfer states have been made both in solution and solid state¹. Temperature dependent emission and delayed emission are used to map the energy levels involved in molecule decay, and through detailed kinetic modelling of the thermally activated processes observed, true electron exchange energies and other energy barriers of the systems determined.

For specific donor acceptor molecular configurations, the CT singlet and triplet states are found to be the lowest lying excited states of the molecule with very small electron exchange energies = kT. In these cases the decay kinetics of the molecules become significantly different to normal molecules, and the effect of rapid recycling between CT singlet and triplet states is seen to greatly extend the lifetime of the ‘excited state’ and yield non-exponential decay. Quantum yields increase markedly, even though the intersystem crossing rate is fast, ? 10⁹ s^-1. The decay kinetics is found to be very sensitive to both temperature and sample inhomogeneity², see figure 1. Temperature dependent delayed emission measurements reveal very different time domain behaviour and the effects of ICT emitter inhomogeneity is revealed. Clear evidence will be given to show that TADF reaches 100% efficiency at harvesting triplet states^1,3, and device having > 15% EQE discussed.

 We will then go on to show the results for an ICT molecule with highly controlled structure i.e. the donor and acceptor fragments are held rigidly orthogonal. In this molecule the CT states can clearly be seen to be the lowest energy states of the molecule with a very small exchange energy (singlet triplet gap). Here we find that there are substantial differences between optical and electroluminescent photophysics resulting in device being far more efficient than is suggested by the molecules PLQY. For the first time we can show that the PLQY of the emitter is not the figure of merit to use in a device, because the excited states are formed in a different way within the device which avoids a major excited state quenching mechanism. This will be discussed in a new molecule that has a PLQY of 30% but gives devices having >19% EQE.

 TADF thus not only enables 100% of triplet states to be harvested, the charge transfer states which give rise to emission and TADF also enable more efficient singlet emission than ‘PLQY’ would lead us to believe.

 References

 1    V. Jankus, C. J. Chiang, F. Dias, and A. P. Monkman, Adv Mater 25, 1455 (2013).

2    F. B. Dias, K. N. Bourdakos, V. Jankus, K. C. Moss, K. T. Kamtekar, V. Bhalla, J. Santos, M. R. Bryce, and A. P. Monkman, Adv Mater 25, 3707 (2013).

3    D. Graves, V. Jankus, F. B. Dias, and A. Monkman, Adv Funct Mater 24, 2343 (2014).

4      Vygintas Jankus, Przemyslaw Data, David Graves, Callum McGuinness, Jose Santos, Martin R. Bryce, F. B. Dias, and A. P. Monkman, Advanced Functional Materials 24, 6178. (2014).

 Date: 24/April/2015 – (friday) – Place: Sala 212 – Auditório do Departamento de Física- Time: 10h15min

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THE PHYSICS GRADUATE PROGRAM invites everyone to the seminar: 

Detection of quantum entanglement: experiments with spatially entangled photon pairs 

Stephen Patrick Walborn

Instituto de Física – UFRJ

 Abstract:

The twin photons produced by spontaneous parametric down-conversion have been an exceptional tool for the study of entanglement and quantum information. The spatial correlation of these photons was one of the first properties to be studied. Nevertheless, the convenient and efficient detection of quantum entanglement in the spatial variables is still an active area of research, with possible applications in quantum cryptography and communication. Here we present several experiments performed at the Quantum Optics Laboratory at the Instituto de Física, Universidade Federal do Rio de Janeiro. We present several novel experimental methods to detect the entanglement in the transverse spatial variables of photon pairs. Both methods use spatial light modulators to imprint an appropriate phase profile on the down-converted photons. Our first method uses this phase profile to measure the spatial correlation functions directly. With these, we can evaluate known entanglement witnesses in a more efficient fashion, without the need for a position-dependent detection system. Our second method uses complementary masks to discretize the detection system, again allowing for a more efficient identification of entanglement via a novel entanglement witness.

Date: 17/April/2015 – (friday) – Place: Sala 212 – Auditório do Departamento de Física– Time: 10h15min

5min

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 THE PHYSICS GRADUATE PROGRAM invites everyone to the seminar: 

   O Lado Escuro do Universo  

Rogerio Rosenfeld – Instituto de Física Teórica / UNESP

Abstract:

 Sabemos hoje que apenas 5% do Universo é composto de átomos. Nesse colóquio vou descrever brevemente o que pensamos que são os 95% restantes: matéria escura e energia escura.

Date: 10/April/2015 – (friday) – Place: Sala 212 – Auditório do Departamento de Física– Time: 10h15min

The Physics Graduate Program invites everyone to:

 Defense of Doctoral Thesis

 Marcos João Correia

ESTUDO DE NANOPARTÍCULAS MAGNÉTICAS ATRAVÉS DE SIMULAÇÕES COMPUTACIONAIS

Defense Committee:

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

Prof. Dr. Walther Schwarzacher – (external member) – University of Bristol

Drª. Sueli Hatsumi Masunaga – (external member) – USP/IF

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

Prof. Dr. Lucas Nicolao – (local member) – UFSC/FSC

Prof. Dr. Marcelo Freitas de Andrade – (local member) – UFSC/Araranguá

Prof. Dr. Marcus Emmanuel Benghi Pinto – (supplementary member)- UFSC/FSC

Date: 09/April/2015 – thursday – Times: 9:30 am – Place: Sala 212 – Auditório do Departamento de Física

The Physics Graduate Program invites everyone to:

Qualifying Examination for Doctoral Thesis

 Carlos Gentil Oro Lemos

 TEOREMAS DE FLUTUAÇÕES APLICADOS A MODELOS MAGNÉTICOS

Defense Committee:

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

Prof. Dr. Masayuki Oka Hase – (external member) – USP

Prof. Dr. Eduardo Inacio Duzzioni – (local member) – UFSC/FSC

Prof. Dr. Eduardo Cerutti Mattei – (local member) – UFSC/FSC

Prof. Dr. Lucas Nicolao – (supplementary member) – UFSC/FSC

Date: 02/April/2015 – thursday – Time: 10:00 am – Place: Sala 114 – Sala de Reuniões do Departamento de Física

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 The Physics Graduate Program invites everyone to:

 Defence of M.Sc. dissertation

 Giovanni Formighieri

 O ESPAÇO-TEMPO DE UM DIPOLO MAGNÉTICO

Defense Commitee

 Prof. Dr. Celso de Camargo Barros Junior – (president) – UFSC/FSC

Prof. Dr. Marcelo Dalagnol Alloy – (external member) – UFFS/Chapecó

Profª. Drª. Débora Peres Menezes – (local member) – UFSC/FSC

Prof. Dr. Eduardo Cerutti Mattei – (local member) – UFSC/FSC

Date: 31/March/2015 – tuesday – Time: 5:00 pm – Place: Sala 201 – Sala de Reuniões do Programa de Pós-Graduação em Física