The Physics Graduate Program invites everyone to:

 Defense of Doctoral Thesis

 Diego Fernando Silva Sousa

CHARACTERIZATION OF THE P3HT:COPC DONOR BLEND FOR APPLICATIONS IN PHOTOVOLTAIC DEVICES

Defense Committee:

Prof. Dr. Ivan Helmuth Bechtold – (president) – (UFSC/FSC)

Prof. Dr. Roberto Mendonça Faria – (external member) – IFUSP/São Carlos

Prof. Dr. Douglas José Coutinho – (supplementary member) –  UTFPR

Profª. Drª. Françoise Toledo Reis – (membro titular) – UFSC/FSC

Prof. Dr. Leonardo Negri Furini – (201600671) – UFSC/FSC

Profª. Drª. Marta Elisa Rosso Dotto – (supplementary member) – UFSC/FSC

Profª. Drª. Juliana Eccher – (supplementary member)- UFSC/FSC

Date: December 14, 2021 – tuesday – Times: 2:00 pm – Place: sala virtual da Conferência Web da Rede Nacional de Ensino e Pesquisa (RNP)

Virtual room access link: https://conferenciaweb.rnp.br/webconf/ivan-helmuth

We have released an Ordinance changing the schedule and accepting the EUF 3-2021 grade for admission in the Selection Process 2022/1.

Click here for more details.

THE PHYSICS GRADUATE PROGRAM invites everyone to the seminar:

Structured light for computation and light conversion

PhD Nara Rubiano da Silva

Postdoc fellow – GIQSul – UFSC

Abstract:

Structured light displays intricate field distributions (of intensity, phase, polarization) in space, with several emerging applications. In the Quantum Optics Laboratory at UFSC, we study classical and quantum processes utilizing such optical fields. In this talk, I will present two of our recent results in the classical regime. Firstly, we manipulate the phase of light for realizing a computational task, namely, a matrix-by-vector multiplication. Each matrix or vector element is mapped into the tranverse phase distribution of the light beam, and the required operations are realized by optical elements. I will introduce this optical processor and, as an example, its application to an optimization problem called unidimensional Distance Geometry Problem. In a second work, we investigate a fundamental aspect of employing structured beams of the Laguerre-Gauss family in stimulated parametric down-conversion. Specifically, we analyse the selection rules involving the radial order of the resulting LG beams, which I will discuss in my talk.

Date: December 3, 2021 – (friday) – Time: 10:15 a.m.

link to access the youtube channel: https://youtu.be/PHyzke71iHQ

The Physics Graduate Program invites everyone to:

Qualifying Examination for Doctoral Thesis

Carline Biesdorf

MODIFIED MIT BAG MODELS AND QCD PHASE DIAGRAMS

Defense Committee

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

Prof. Dr. Marcelo Dallagnol Alloy – (local member) – UFSC/Blumenau

Prof. Dr. Luiz Laércio Lopes – (external member) – CEFET/MG

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

Prof. Dr. Tiago José Nunes da Silva – (local member) – UFSC/FSC

Date: December 1st, 2021 – Wednesday – Time: 10:00 am – Place: por intermédio da plataforma Google Meet

Link to access virtual room: https://meet.google.com/reu-rgkr-kct

THE PHYSICS GRADUATE PROGRAM invites everyone to the seminar:

Detailed chrono-chemo-dynamics of seven metal-poor red giants from Kepler

Arthur Alencastro Puls

Research School of Astronomy and Astrophysics, Australian National University

Abstract:

The Kepler mission has yielded a revolution in the field of GalacticArchaeology, with its photometry allowing the determination of stellar parameters with an unprecedented level of precision for Red Giant stars. Recent studies have shown that a few of these objects display conflicting characteristics in the age-metallicity space (e.g., young and metal-poor). In this project we combine asteroseismic information from solar-like oscillations, high-resolution spectroscopy and Gaia astrometry to derive stellar ages, chemical abundances and kinematics for a group of metal-poor Red Giants, and characterise them in a multidimensional chrono-chemo-dynamical space. Our results suggest that underestimated parallax errors make the effect of Gaia parallaxes more important than different choices of model grid or – in the case of stars ascending the RGB – mass-loss prescription. Two stars are identified as potentially evolved halo blue stragglers. Four objects are likely members of the accreted Milky Way halo, and their possible relationship with known accretion events, such as Gaia-Sausage and Gaia-Sequoia, is discussed.

Date: November 26, 2021 – (friday) – Time: 10:15 a.m.

link to access the youtube channel: https://youtu.be/D1pIcDUoHds

THE PHYSICS GRADUATE PROGRAM invites everyone to the seminar:

Chemistry in optical microcavities: Spectral fluctuations and energy transport

Prof. Dr. Raphael Ribeiro

Department of Chemistry, Emory University – Atlanta, USA

Abstract:

Optical cavities and metallic nanoparticles confine electromagnetic fields and enable new pathways to control physicochemical processes via strong light-matter interactions. In fact, recent experiments have shown that photonic and plasmonic materials may induce significant and sometimes unexpected changes to physical properties and reactivity of molecular systems. In this talk, I will introduce and present the key results of our recent theoretical investigations on the effects of collective radiation-matter interactions on transport and spectral properties of disordered molecular ensembles hosted by a resonant 1D optical cavity (photonic wire). The main implications of our findings to future theoretical and experimental research will be discussed. I will show that widely employed minimal theoretical models fail to adequately describe photonic effects on the local properties of chemical systems and explain strategies to maximize the influence of optical cavities on molecular materials informed by our simulations.

Date: November 19, 2021 – (friday) – Time: 10:15 a.m.

link to access the youtube channel: https://youtu.be/8nV3QDFmhB8

THE PHYSCIS GRADUATE PROGRAM invites everyone to the seminar:

What Hampers Electron Transport in Organic Crystals? A Close Look at Band-like Transport in N-type Organic Semiconductors

Prof. Dr. Emanuele Orgiu

Institut National de la Recherche Scientifique – INRS, Québec – Canada

Abstract:

Charge transport in organic semiconductors is notoriously sensitive to the presence of disorder, both intrinsic and extrinsic, especially for n-type materials. Intrinsic dynamic disorder stems from large thermal fluctuations both in intermolecular transfer integrals and (molecular) site energies in weakly interacting van der Waals solids and sources transient localization of the charge carriers. The molecular vibrations that drive transient localization typically operate at low-frequency (< a-few-hundred cm-1), which makes it difficult to assess them experimentally. Hitherto, this has prevented the identification of clear molecular design rules to control and reduce dynamic disorder. In addition, the disorder can also be extrinsic, being controlled by the chemical and physical “coupling” of the π-conjugated core to the gate dielectric. During the Colloquium, I will present a comprehensive study of charge transport in two closely related n-type molecular organic semiconductors using a combination of temperature-dependent inelastic neutron scattering and photoelectron spectroscopy corroborated by electrical measurements, theory and simulations. By doing so, unambiguous evidence is provided that ad hoc molecular design enables to free the electron charge carriers from both intrinsic and extrinsic disorder to ultimately reach band-like electron transport.

Date: November 12, 2021 – (friday) – Time: 10:15 a.m.

link to access the youtube channel: https://youtu.be/TE3LD1NKi4c

THE PHYSCIS GRADUATE PROGRAM invites everyone to the seminar:

Gauge invariant quantum thermodynamics: consequences for the first law

Prof. Dr. Lucas Chibebe Céleri

Instituto de Física – UFG

Abstract:

Universality of classical thermodynamics rests on the central limit theorem, due to which measurements of thermal fluctuations are unable to reveal detailed information regarding the microscopic structure of a macroscopic body. When small systems are considered and fluctuations become important, thermodynamic quantities can be understood in the context of classical stochastic mechanics. A fundamental assumption behind thermodynamics is therefore that of coarse-graining, which stems from a substantial lack of control over all degrees of freedom. However, when quantum systems are concerned, one claims a high level of control. As a consequence, information theory plays a major role in the identification of thermodynamic functions. Here, drawing from the concept of gauge symmetry, essential in all modern physical theories, a new, intermediate, route is put forward. Working within the realm of quantum thermodynamics, a physically motivated gauge transformation, which encodes a gentle variant of coarse-graining behind thermodynamics, is explicitly constructed . As a consequence, quantum work and heat are reinterpreted, as well as the role of quantum coherence.

Date: November 5, 2021 – (friday) – Time: 10:15 a.m.

link to access the youtube channel: https://youtu.be/ieeh_LtXBgI

O Programa de Pós-Graduação em Física da UFSC torna público os editais do processo seletivo para os cursos de mestrado e doutorado para ingresso no semestre 2022/1.

As inscrições ocorrerão no período de 1 a 30 de novembro de 2021. O PPGFSC utiliza a nota do Exame Unificado de Pós-Graduações em Física – EUF para ingresso nos cursos de mestrado de doutorado.

Click aqui e acesse o site do processo seletivo do PPGFSC/UFSC.

Below is the link to access the result of the PPGFSC / UFSC Simplified Selection Process for admission to master and doctoral courses in the semester 2021/2:

Results

The candidates who receive a scholarship will be informed after the Scholarship Committee meeting.