The Physics Graduate Program invites everyone to:

Qualifying Examination for Doctoral Thesis

Cheryl Henkels de Souza

ESTRUTURAS DE PRÓTON COM DEPENDÊNCIA EM PARÂMETRO DE IMPACTO A ALTAS ENERGIAS

Defense Committee:

Prof. Dr. Emmanuel Gräve de Oliveira – (president) – UFSC/FSC
Prof. Dr. Magno Valério Trindade Machado – (local member) – UFRGS
Prof. Dr. Bruno Duarte da Silva Moreira – (local member) – UDESC
Prof. Dr. Celso de Camargo Barros Junior – (local member) – UFSC/FSC

Date: December 11, 2020 – friday – Time: 2:00 pm

link to access virtual room: https://conferenciaweb.rnp.br/webconf/ppgfsc-ufsc

The Physics Graduate Program invites everyone to:

Defense of Doctoral Thesis

Marcelo Salvador

MAGNETIC PROPERTIES OF SYSTEMS OF SINGLE DOMAIN NANOPARTICLES

Defense Committee:

Prof. Dr. Lucas Nicolao – (president) – (UFSC/FSC)
Prof. Dr. Walther Schwarzacher – (external member) – University of Bristol
Prof. Dr. Álvaro de Almeida Caparica – (external member) – UFG
Prof. Dr. Alejandro Mendoza Coto – (local member) – UFSC/FSC
Prof. Dr. Rodrigo Pereira Rocha – (suplementary member) – UFSC/FSC

Date: December 9, 2020 – wednesday – Times: 10:00 am 

virtual room access link: https://conferenciaweb.rnp.br/webconf/ppgfsc-ufsc

THE PHYSICS GRADUATE PROGRAM invites everyone to the seminar:

Investigative In-Silico Design of Domed and Cylindrical Cage-Type Cyclophanes – A Computational Insight
Giovanni F. Caramori
Chemistry Department, Federal University of Santa Catarina

Abstract:

The role of functional groups in supramolecular systems determines its ability to recognize other molecules, as well as to rearrange its conformation into a specific shape.1,2,3 Cyclophanes are strained molecular cages that possess unusual chemical behavior, arising from its congested framework. Not only such constrained molecular frameworks are a noteworthy synthetic challenge target, but they are also known for being part of the “Hall of Fame” of molecules with ultra-short non-bonded contacts, and to be selective to determined guests. Cylindrophanes are fluoride selective hosts, which coordinate the anion through anion-π, H-bond, and ion-pair interactions. Both together are great examples that show how crucial such cyclophanes molecular framework is to be chemically investigated. The cyclindrophane unveiled the role of functional groups in the fluoride coordination. Structural modifications proposed to the functional groups in the cylindrophanes were mainly done to determine the importance of the anion-π interactions arising from the π-systems, and the strong short-range H-bond interactions from the bridges binding groups, to the guest stability. The results provided here make use of an avant-garde theoretical approach that elucidated unique structural and energetic aspects of the cage-type of cyclophanes, evaluating, in the light of Kohn-Sham Density Functional Theory (DFT), with dispersion corrections (BJ-D3), both,the influence of the π-systems, and the nature of the heteroatoms located at the bridges. Rationalization of the physical nature of the non-covalent interactions has becoming possible through the use of wave function, and electron density analyses such as Energy Decomposition Analysis (EDA), Natural Bond Orbitals (NBO), Quantum Atoms in Molecules (QTAIM). The role of cylindrophanes functional groups that coordinate the fluoride reveals that the guest stabilization is mainly dependent on the non-covalent interactions with the bridge binding group. The ability of the ligands to better interact with the anion inside the cavity was found to be modulated by the cyclophane π-systems, in that the short-range effects of the binding groups are found to be the strongest in the cylindrophane containing benzene, not the π-acidic arenic systems.
1J. Org. Chem. 2018, 83, 5114-5122
2ChemPhysChem 2020, 21, 1989-2005
3Dalton Trans. 2020, DOI:10.1039/D0DT03518A

Date: December 11, 2020 – (friday) –  Time: 10:15 a.m.

link to access the youtube channel: https://youtu.be/479D-CuDHo4

THE PHYSICS GRADUATE PROGRAM invites everyone to the seminar:

Triplet Harvesting in Organic Light Emitting Diodes

Fernando B. Dias

Department of Physics, Durham University, Durham DH1 3LE, UK.

Abstract:

In this talk we will discuss recente investigations on the development of organic materials with eficiente triplet harvesting properties. The photophysics of bi-metallic compounds showing eficiente room-temperature phosphorescence (RTP) and donor-acceptor compounds showing eficiente termal activated delayed fluorescence (TADF) will be discussed. These materials have enormous potential in diferente technological applications, including the development of materials for oxygen, and temperature sensing, bio-imaging, and in organic light emitting diodes (OLEDs). This tal kis aimed to a non-specialized audience, covering fundamental concepts in the photophysics of these materials, and also discussing techniques and methods that are currently used on their characterizations. I hope this talk to be an excelent opportunity for someone that is starting to work in this field to ask all these buming questions we all have when entering a new area of research.

Date: November 27, 2020 – (friday) – Time: 10:15 a.m.

link to access the youtube channel: https://youtu.be/CU6Hb5epklE

The Physics Graduate Program invites everyone to:

Defence of M.Sc. dissertation

William Renan Basso Bassoli

PRODUCTION AND PROCESSING OF Fe(1+x)Ni(1-x) NANOSTRUCTURED ALLOYS

Defense Commitee

Prof. Dr. Valderes Drago – (president) – UFSC/FSC
Prof. Dr. Aloisio Nelmo Klein – (external member) – UFSC/EMC
Profª. Drª. Cristiani Campos Plá Cid – (local member) – UFSC/FSC
Profª. Drª. Deise Schafer – (local member) – UFSC/FSC

Date: November 27, 2020 – friday – Time: 9:00 am 

virtual room access link: https://conferenciaweb.rnp.br/webconf/ppgfsc-ufsc

THE PHYSICS GRADUATE PROGRAM invites everyone to the seminar:

Quantum Information using Nonlinear Graphene Plasmonics

Prof. Dr. Lee Rozema

Universidade de Viena

Abstract:

Although linear optical quantum technologies are one of the more promising routes to achieve feasible quantum technologies, in part due to the robustness and mobility of single photons, the creation of a two-qubit logic gate remains a challenge. In this talk, I will review our theoretical proposal to implement a universal quantum Zeno “square-root-of-swap” gate by encoding qubits in graphene surface plasmons. This gate does not require any cryogenic or vacuum technology, and has a footprint of a few hundred nanometers, suggesting that graphene plasmonics offers a new route towards scalable quantum technologies. I will first focus on the physics behind the Zeno gate, and then introduce the promising platform of nonlinear graphene plasmonics, showing how it could be used for quantum computing. Finally, I will present our recent experimental work demonstrating plasmon-mediated optical nonlinearities: a first step towards our long-term goal of single-photon level nonlinearities.

Date: November 13, 2020 – (friday) – Time: 10:15 a.m.

link to access the youtube channel: https://youtu.be/bhDnyO2verc

THE PHYSICS GRADUATE PROGRAM invites everyone to the seminar:

RAMSES II – RAMan Search for Extragalactic Symbiotic Stars

PhD. Denise R. Gonçalves

Observatório do Valongo – UFRJ (Brazil)

Abstract:

Abstract: Symbiotics are binary systems of evolved stars that show the most energetic stellar explosions after supernovae. Constituting probable channels to Type Ia SNe, they are important to understand the relation between the SN rate in a galaxy and the number of symbiotic systems at present-time. Therefore, it is very relevant to make a census of symbiotic systems in nearby galaxies. Such a census was never carried out in dwarf galaxies. In the Galaxy many symbiotic systems possess the O VI Raman scattering line at 6830A. This line allowed the discovery of a few extragalactic symbiotic systems recently, in NGC 6822, NGC 185 and NGC 205, among others. Our ongoing RAMSES II project is aimed at searching for symbiotics in the nearby dwarf galaxies, via deep narrow-band imaging that allows to detect the O VI Raman scattered feature. This detection per se implies the existence of symbiotic systems. As a follow up of this first step, we will use optical plus IR spectroscopy to completely characterize the systems, in order to better link them with the scenario of SNe Ia progenitors. In this talk I will describe the RAMSES II project and discuss its first results.

Date: November 6, 2020 – (friday) –  Time: 10:15 a.m.

link to access the youtube channel: https://youtu.be/2g7k2Tmgf9o

The Physics Graduate Program invites everyone to:

Defence of M.Sc. dissertation

Katia Slodkowski Clerici

MEASURES OF CHEMICAL ABUNDANCES FROM STACKED SPECTRA OF GALAXIES

Defense Commitee

Profª. Drª. Natalia Vale Asari – (president) – UFSC/FSC
Prof. Dr. Tiago Vecchi Ricci – (external member) – UFFS/Cerro Largo
Prof. Dr. Daniel Ruschel Dutra – (local member) – UFSC/FSC

Date: November 5, 2020 – thursday – Time: 10:00 am 

virtual room access link: https://conferenciaweb.rnp.br/webconf/ppgfsc-ufsc

THE PHYSICS GRADUATE PROGRAM invites everyone to the seminar:

Detectando não-classicalidade com modelos causais

Prof. Dr. Rafael Chaves
IIP/UFRN

Abstract:

Apesar de seu sucesso inabalável, é comum escutarmos que a teoria quântica é estranha, contraintuitiva e até mesmo paradoxal. Roger Penrose, o mais recente ganhador do prêmio Nobel de Física, disse certa vez: “A mecânica quântica não faz o menor sentido”. De fato, conceitos como dualidade onda-partícula, emaranhamento e não-localidade quântica, parecem estar em claro desacordo com nossa intuição. Seria possível definir matematicamente essa contraintuição/não-classicalidade? Neste seminário discutiremos como a teoria da causalidade nos oferece um arcabouço especialmente adequado para responder em afirmativo a esta pergunta. Aplicaremos este formalismo em exemplos paradigmáticos, tal como o experimento de fenda dupla e o experimento de Bell, com resultados surpreendentes. Ao final, exploraremos mais a fundo a relação entre causa e efeito e correlações quânticas em um teste de importância fundamental no campo da inferência causal.

Date: October 30, 2020 – (friday) – Time: 10:15 a.m.

link to access the youtube channel: https://youtu.be/sSV64V7BsXA

The Physics Graduate Program invites everyone to:

Qualifying Examination for Doctoral Thesis

Marcos Vinicios Barp

ESPALHAMENTO DE PÓSITRONS POR SISTEMAS DE CAMADA ABERTA

Defense Committee:

Prof. Dr. Felipe Arretche – (president) – UFSC/FSC
Prof. Dr. Pawel Klimas – (local member) – UFSC/FSC
Prof. Dr. Ivan Helmuth Bechtold – (local member) – UFSC/FSC
Prof. Dr. Lucio Sartori Farenzena – (local member) – UFSC/FSC

Date: October 30, 2020 – friday – Time: 3:00 pm – Place: ConferênciaWeb da Rede Nacional de Pesquisa

link to access virtual room: https://conferenciaweb.rnp.br/webconf/ppgfsc-ufsc