Seminário con Dra. Nara Rubiano da Silva- 3 de deciembre de 2021 (viernes) – 10:15 a.m.

30/11/2021 08:30

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

Structured light for computation and light conversion

Dra. Nara Rubiano da Silva

Pós-doutoranda – GIQSul – UFSC


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.

Fecha: 3 de deciembre de 2021 – (viernes) – Horário: 10:15 a.m.

Enlace acceso al canal de youtube:

Examen de Cualificación al Doctorado de Carline Biesdorf – 1 de diciembre de 2021 – Miércoles – 10:00 am

25/11/2021 15:58

El Programa de Posgrado en Física invita a todos para:

Examen de Cualificación al Doctorado

Carline Biesdorf




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

Prof. Dr. Marcelo Dallagnol Alloy – (miembro titular) – UFSC/Blumenau

Prof. Dr. Luiz Laércio Lopes – (miembro externo) – CEFET/MG

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

Prof. Dr. Tiago José Nunes da Silva – (miembro titular) – UFSC/FSC

Fecha: 1 de diciembre de 2021quarta-feira – Horario: 10:00 am – Lugar: a través de la plataforma Google Meet


 Enlace de acceso a la sala virtual:

Seminário con Arthur Alencastro Puls- 26 de noviembre de 2021 (viernes) – 10:15 a.m.

22/11/2021 19:25

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

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

Arthur Alencastro Puls

Research School of Astronomy and Astrophysics, Australian National University


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.

Fecha: 26 de noviembre de 2021 – (viernes) – Horário: 10:15 a.m.

Enlace acceso al canal de youtube:

Seminário con Prof. Dr. Raphael Ribeiro- 19 de noviembre de 2021 (viernes) – 10:15 a.m.

16/11/2021 12:55

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

Chemistry in optical microcavities: Spectral fluctuations and energy transport

Prof. Dr. Raphael Ribeiro

Department of Chemistry, Emory University – Atlanta, USA


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.

Fecha: 19 de noviembre de 2021 – (viernes) – Horário: 10:15 a.m.

Enlace acceso al canal de youtube:

Seminário con Prof. Dr. Emanuele Orgiu- 12 de noviembre de 2021 (viernes) – 10:15 a.m.

08/11/2021 15:42

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

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


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.

Fecha: 12 de noviembre de 2021 – (viernes) – Horário: 10:15 a.m.

Enlace acceso al canal de youtube:

Seminário con Prof. Dr. Lucas Chibebe Céleri- 5 de noviembre de 2021 (viernes) – 10:15 a.m.

01/11/2021 09:05

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

Gauge invariant quantum thermodynamics: consequences for the first law

Prof. Dr. Lucas Chibebe Céleri

Instituto de Física – UFG


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.

Fecha: 5 de noviembre de 2021 – (viernes) – Horário: 10:15 a.m.

Enlace acceso al canal de youtube:

Seminário con Dr. Rafael Bento Serpa- 29 de octubre de 2021 (viernes) – 10:15 a.m.

25/10/2021 15:52

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

Virtual-Slit Focusing in a Cycloidal Mass Spectrometer – A Proof of Concept

Dr. Rafael Bento Serpa

Postdoctoral Associate | Duke University Nanomaterials and Thin Films Lab


This work demonstrates a novel approach to mass spectrometry using the “virtual-slit” created by the small, spatial volume from which ions are generated by localized ionization techniques (e.g., laser ionization of particles and surfaces, and spark ionization). That is, the volume in which the ions are generated creates a localized source of ions in much the same way as a slit that allows only ions from a specific cross-sectional area to pass. As demonstrated in this work, the unique perfect focusing properties of a cycloidal mass analyzer can enable the localized ionization volume to function as a virtual slit. In this manuscript, we provide a proof-of-concept (POC) demonstration of a virtual-slit cycloidal mass spectrometer (VS-CyMaS) consisting of a cycloidal mass analyzer, a laser ionization source, and an ion array detector. The laser is used to ionize either bulk or thin-film samples of Cu, Ti, Ni, and Cr. Results indicate that the width of the peaks at the detector is the same as the laser spot size, validating the concept of virtual-slit focusing. Furthermore, the material ablated with each laser pulse for Ti and Cu is estimated at 60 and 140 fg, respectively, indicating that a very low detection limit is possible given the ability of the cycloidal mass analyzer to collect ions generated by laser ionization that have wide energy and angular dispersions.

Fecha: 29 de octubre de 2021 – (viernes) – Horário: 10:15 a.m.

Enlace acceso al canal de youtube:

(Português) Defesa de tese de Everton Botan – 29 de outubro de 2021 – sexta-feira – Horário: 9h30min

20/10/2021 12:28

Sustentación de Tesis

Everton Botan


Prof. Dr. Roberto Kalbusch Saito – (presidente) – UFSC/FSC

Prof. Dr. Jacques Raymond Daniel Lepine – (miembro externo) – IAG/USP

Prof. Dr. Helio Jaques Rocha-Pinto – (miembro externo) – Observatório do Valongo – UFRJ

Prof. Dr. Daniel Ruschel Dutra – (membro titular) – UFSC/FSC

Prof. Dr. Antônio Nemer Kanaan Neto – (miembro titular) – UFSC/FSC

Fecha: 29 de octubre de 2021 viernes – Horario: 9:30 am – Lugar: videoconferencia

Enlace de acceso a sala virtual:


Seminário con Dr. Omar Roldán- 22 de octubre de 2021 (viernes) – 10:15 a.m.

19/10/2021 11:28

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

Aberration and Doppler effect on the CMB: kinematical and intrinsic contributions

Dr. Omar Roldán

Pós-doutorando – UFRJ


The aberration and Doppler coupling effects of the Cosmic Microwave Background (CMB) were measured by the Planck satellite. The most straightforward interpretation leads to a direct detection of our peculiar velocity, consistent with the measurement of the well-known dipole. We show however, that in some cases a primordial dipolar potential can also produce such effects. But in addition it produces other signatures due to integrated terms which we will discuss in some detail. We also discuss how aberration measurements can be used to constraint some models which introduce super-horizon perturbations to explain the hemispherical asymmetry. This work has also been used to infer the Intrinsic Dipole. Finally we also discuss about CMB anisotropies at all orders and the non-linear Sachs-Wolfe formula.

Most of the seminar is based on the paper:
Other References:

Fecha: 22 de octubre de 2021 – (viernes) – Horário: 10:15 a.m.

Enlace acceso al canal de youtube:

Seminário con Prof. Dr. Luis Guilherme de Carvalho Rego- 15 de octubre de 2021 (viernes) – 10:15 a.m.

11/10/2021 18:24

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

Transporte eletrônico em nanoestruturas com quiralidade

Prof. Dr. Luis Guilherme de Carvalho Rego

Departamento de Física, UFSC


A quiralidade geométrica é facilmente percebida em uma figura cuja imagem no espelho não pode ser superposta com ela mesma. No entanto, o conceito de quiralidade dinâmica tem mais relevância, pois conecta o mundo observável com propriedades fundamentais da natureza. Neste trabalho (DOI:10.1021/acs.nanolett.1c02636) investigamos a propagação de elétrons em nanofios helicoidais e verificamos que a interação entre momento angular de spin e a quiralidade do nanofio, interligados pela interação spin-órbita, gera uma assimetria na direção de propagação das partículas. O efeito é induzido pela quebra de paridade, causada pela quiralidade da estrutura molecular do fio. Para realizar este estudo utilizamos um modelo microscópico que leva em consideração a interação spin-órbita no material. Os cálculos são aplicados a um novo material, uma cadeia dupla hélice totalmente inorgânica feita do material SnIP, que é um semicondutor com bandgap de ~ 1,9 eV. Por fim, consideramos a relação deste efeito com fenômenos associados, dentre eles: polarização de spin induzida por quiralidade (efeito CISS), propagação de carga em nanotubos de carbono, e atividade óptica em materiais quirais e metamateriais.

Fecha: 15 de octubre de 2021 – (viernes) – Horário: 10:15 a.m.

Enlace acceso al canal de youtube: 


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