THE PHYSICS GRADUATE PROGRAM invites everyone to the seminar:

Atomic entangling operations assisted by multiphoton states

Dr. Juan Mauricio Torres Gonzalez
IFUAP/IF – México

Abstract:

We propose and theoretically investigate the implementation of entangling operations on two two-level atoms using cavity-QED scenarios. The atoms interact with optical cavities and their state is postselected in a noninvasive way by measuring the optical field after the interaction. We show that the resulting quantum operation can be exploited to implement quatum information protocols such as entanglement purification and a Bell state measurement. In contrast with previous purifications schemes, a fidelity larger than one half with respect to any Bell state is not a necessary condition.

Date: May 24, 2019 – (friday) – Place: Sala 212 – Auditório do Departamento de Física – Time: 10:15 a.m.

The Graduate Program in Physics of  Federal University of  Santa Catarina – PPGFSC/UFSC, Florianópolis, announces the vacancy of 1 (one) postdoctoral scholarship from the (Programa Nacional de Pós-doutorado da Coordenação de Aperfeiçoamento de Pessoal de Nível Superior  – PNPD/CAPES), to the period of 2 (two) years, it can be renewed annually at a maximum of 60 months.

The monthly amount of the scholarship is R$ 4.100.00 (four thousand one hundred reais) beyond the values destined to assets.

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THE PHYSICS GRADUATE PROGRAM invites everyone to the seminar:

Osciladores Óticos: passado, presente e futuro

Renné Luiz Câmara Medeiros De Araujo
UFSC/FSC

Abstract:

Osciladores Óticos são dispositivos capazes de gerar ondas luminosas coerentes. Incluem-se aí, por exemplo, os lasers e os Osciladores Paramétricos Óticos (OPOs), principais temas deste seminário.
O laser nasceu na década de 1960 para revolucionar nossa capacidade de sondar a interação da luz com a matéria. Ainda na mesma década, surgiu o primeiro OPO, um tipo de fonte luminosa versátil de comprimento de onda sintonizável. Hoje, o laser e o OPO são ferramentas básicas de pesquisa e a presença do laser em diversas tecnologias cotidianas é notória. O OPO, por sua vez, com suas características não-clássicas, é usado para melhorar a precisão detectores de ondas gravitacionais e compõe arquiteturas de comunicação e computação quânticas.
Neste seminário, contarei um pouco desta história, ressaltando as propriedades quânticas da luz e apontando a direção em que caminham as pesquisas atuais na área.

Date: May 17, 2019 – (friday) – Place: Sala 212 – Auditório do Departamento de Física – Time: 10:15 a.m.

THE PHYSICS GRADUATE PROGRAM invites everyone to the seminar:

From Transistors to Switchable Memories: Development of Memristors for Data Processing
Miguel Henrique Boratto
Pós-doutorando – UFSC/FSC

Abstract:

The evolution of data-processing is dynamic and keeps changing the way we live nowadays. The device that immensely contributed for this advance, since the 1950s, is the transistor, the key of the evolution of electronic components. The great improvement of these devices has allowed the fabrication of small size and high-speed data-processing electronic equipment, such as the smartphones, million times faster than old computer machines. The commercial Random-Access Memory (RAM) is volatile, fabricated with a series of transistors and capacitors. A certain performance saturation has been achieved in these memories due to its volatile characteristic but also caused by the low performance of data transfer between the RAM and processing and storage units. A way to overcome such inertia is changing and exploring new architectures and materials such as the memristor, a non-volatile resistive switchable memory, that presents a simpler architecture with the necessary characteristics to substitute the transistor in data processing and storages [1,2]. The use of memristors may eliminate the use of three units (RAM, permanent storage, and processing) by doing all work simultaneously, avoiding the loss of processing speed caused by the transfer of data between units.
In this seminar, I will present a brief history of transistor and the differences between RAM and storage units. An emphasis will be given on the characteristics of memristors, as well as some state-of-the-art results obtained so far in the literature.
[1] M.H. Boratto, et al, Applied Surface Science, 410, 278-281, 2017. Doi: http://dx.doi.org/10.1016/j.apsusc.2017.03.132
[2] J.J.Yang et al, Nature Nanotechnology, 8, 13-24, 2013. Doi: 10.1038/NNANO.2012.240

Date: May 10, 2019 – (friday) – Place: Sala 212 – Auditório do Departamento de Física – Time: 10:15 a.m.

The Physics Graduate Program invites everyone to:

Defense of Doctoral Thesis

Bruna Fernanda Baggio

SCANNING TUNNELING MICROSCOPY OF COBALT PORPHYRINS ON CU2N INSULATING MONOLAYER ON Cu(100)

Defense Committee:

Prof. Dr. André Avelino Pasa – (president) – (UFSC/FSC)
Dr. Maximiliano Delany Martins – (external member) – CDTN
Dr. Vinicius Claudio Zoldan – (external member) – CEITEC
Prof. Dr. Wagner Figueiredo – (membro titular) – UFSC/FSC
Drª. Deise Schafer – (local member) – UFSC/FSC

Date: May 6, 2019 – monday – Times: 10:00 am – Place: Sala 114 – Sala de reunião do Departamento de Física

THE PHYSICS GRADUATE PROGRAM invites everyone to the seminar:

A New Experimental-3D Physical Modeling Approach Predicting Favorable Biomaterial-Cell Interactions
Rodney Marcelo do Nascimento
Pós-doutorando – UFSC/FSC

Abstract:

Despite several decades of research on biomedical implant materials, the identification of predictive and robust in vitro characteristics of cell support ability and viabilities—as indicators of biocompatibility and future implant-tissue integration—remain elusive. This study addresses the phenomenology of cell implant interfaces based on experimental, theoretical and numerical analysis of cell response to functionalized bioceramic coatings of commercial titanium implants, cp-Ti. A variable spectrum of coatings having differing surface wettabilities, with optimized solid tension values, was obtained. Measured values were modeled and correlated to cell support ability and viabilities. The contributions of different physico-chemical aspects to cell viability were decoupled resulting in the identification of the polar component of the surface free energy as a significant and major cell-substrate effector. Furthermore, our results and the suggested model establish the thermodynamic interfacial free energy as an omnipotent measure that can be fully correlated to the morphology of an individual cell under numerical simulation matching empirical observations. Collectively, the 3D physical modeling reported herein can offer a new generic theoretical framework, using implementable mathematical simulation, towards the objective of rational biomaterial design that can improve next generation metal and ceramic implants.

Date: May 3, 2019 – (friday) – Place: Sala 212 – Auditório do Departamento de Física – Time: 10:15 a.m.

The Physics Graduate Program invites everyone to:

Defense of Doctoral Thesis

Graziéle Bortolini

MÉTODO DE DINÂMICA MOLECULAR NÃO-ADIABÁTICA BASEADO EM EHRENFEST E HÜCKEL ESTENDIDO

Defense Committee:

Prof. Dr. Robson da Silva Oliboni – (president) – (UFPel)
Dr. Alberto Torres Riera Junior – (external member) – IFT
Prof. Dr. Germano Heinzelmann – (local member) – UFSC/FSC
Prof. Dr. Bernardo de Souza – (membro titular) – UFSC/QMC

Date: May 3, 2019 – friday – Times: 2:00 pm – Place: Auditório do Departamento de Química

The Graduate Program in Physics of UFSC makes public the admission process’s notice to the Master and PhD programs entrance at the semester 2019/2.

Registration will be made up April 25, 2019 until 5 pm on May 30, 2019, The PPGFSC regards the grade of the Brazilian Unified Exam of Physics Graduate Courses (Exame Unificado de Pós-Graduações em Física – EUF) to the entrance at the master and PhD programs.

Click here to access the admission process website of the PPGFSC/UFSC

THE PHYSICS GRADUATE PROGRAM invites everyone to the seminar:

VVV-WIT-07: outra estrela da Tabby ou um objeto de Mamajek?
Roberto Kalbush Saito
UFSC/FSC

Abstract:

Muitas, se não a maioria das estrelas, apresentam variações temporais de brilho. O estudo dessas variações nos ajuda na compreensão da estrutura interna das estrelas e dependendo da escala de tempo e perfil dessas variações estas são classificadas dentro das diversas classes de estrelas variáveis existentes.
VVV-(What Is This?)-07 é uma estrela variável única recentemente descoberta entre as quase 1 bilhão de estrelas observadas pelo projeto VISTA Variables in the Vía Láctea (VVV) na região central da Galáxia. A VVV-WIT-07 apresenta uma sequência recorrente porém não periódica de perdas de brilho ao longo dos anos 2010-2018, com um possível eclipse profundo em julho de 2012 quando o brilho do objeto diminuiu em cerca 80%, o que não é esperado para uma estrela.
As variações de brilho de VVV-WIT-07 são similares àquelas vistas na estrela J1407 (o objeto de Mamajek), onde acredita-se que uma estrela pré-sequência principal é eclipsada por um planeta com anéis muito maiores e densos que os de Saturno ou, alternativamente, à estrela KIC 8462852 (a estrela de Tabby), onde as variações de brilho poderiam estar associadas à presença de anéis irregulares de poeira, planetesimais, ou mesmo uma nuvem de cometas ao redor da estrela.
Neste seminário apresentaremos nossa análise de VVV-WIT-07 baseada em dados do projeto VVV e VVV eXtended (VVVX), e complementada com dados de arquivo e observações espectroscópicas de seguimento. Cenários alternativos, nenhum dos quais totalmente consistente com os dados disponíveis, também serão apresentados.

Date: April 26, 2019 – (tuesday) – Place: Sala 212 – Auditório do Departamento de Física – Time: 10:15 a.m.

THE PHYSICS GRADUATE PROGRAM invites everyone to the seminar:

The ideal Hydrodynamic Limit and its extensions
Prof. Giorgio Torrieri
UNICAMP

Abstract:

We use effective field theory techniques to extend the ideal hydrodynamic limit to systems which, while strongly coupled and instantly thermalizing, exhibit characteristics which are usually not captured by transport theory. We concentrate on systems with non-negligible polarization as well as systems whose microscopic degrees of freedom exhibit non-Abelian gauge symmetry.

Date: April 17, 2019 – (wednesday) – Place: Sala 114 – Sala de reuniões do Departamento de Física – Time: 3:00 p.m.