The Physics Graduate Program invites everyone to:

Qualifying Examination for Doctoral Thesis

 Ariel Werle

 Análise Simultânea de Espectros Ópticos e Fotometria Ultravioleta com o STARLIGHT

Defense Committee:

 Prof. Dr. Roberto Cid Fernandes Junior – (president) – UFSC/FSC

Prof. Dr. Reinaldo Ramos de Carvalho – (local member) – INPE

Prof. Dr. Abilio Mateus Junior – (local member) – UFSC/FSC

Profª. Drª. Natalia Vale Asari – (local member) – UFSC/FSC

Dr. André Luiz de Amorim – (supplementary member) – UFSC/FSC

Date: 15/March/2017 – wednesday – Time: 2:00 pm – Place: Sala 114 – Sala de Reuniões do Departamento de Física

 THE PHYSICS GRADUATE PROGRAM invites everyone to the seminar: 

  Memristors: a primer and perspectives 

Prof. Dr. Gilberto Medeiros

UFMG

 Abstract:

Memristors are one class of devices that cannot be described or emulated by association of resistors, capacitors and inductors. A pinched hysteresis is usually the fingerprint of memristive behaviour [1,2]. Beyond simple modelling presented in the early 70s [1,2], significant experimental progress has been achieved, to the point where now there are several companies and research teams working with these devices in a number of applications ranging from neuromorphic computing [3,4] to non-volatile memories [5]. Here I will discuss the anatomy of conductive channels in memristors, by means of structural and chemical characterization afterproper identification through pressure modulated conductance experiments [6]. Subsequently, the upper limits of switching speeds of these devices will be discussed [7], as well as our modelling results [8]. Finally, complementing the modelling picture I will conclude showing our latest results on noise characteristics of these intriguing devices [9].

References

[1] L. O. Chua, “Memristor – missing circuit element”. IEEE Trans. Circuit Theory CT-18, 507-519 (1971).

[2] L. O. Chua, & S. M. Kang, “Memristive devices and systems”. Proceedings of the IEEE 64,209-223 (1976).

[3] M. Prezioso, et al. “Training and operation of an integrated neuromorphic network basedon metal-oxide memristors”, Nature 521, 61-64 (2015).

[4] J.J. Yang, D.B. Strukov & D.R. Stewart, “Memristive devices for computing”, Nature Nanotech. 8, 13-24 (2013).

[5] for example, http://www.crossbar-inc.com/

[6] F. Miao et al., “Anatomy of a Nanoscale Conduction Channel Reveals the Mechanism of a High-Performance Memristor”, Adv. Mater. 23, 5633-5640 (2011).

[7] A. C. Torrezan, J. P. Strachan, G. Medeiros-Ribeiro, & R.S. Williams, “Sub-nanosecondswitching of a tantalum oxide memristor”, Nanotechnology 22, 485203 (2011).

[8] J.P. Strachan, et al. “State Dynamics and Modeling of Tantalum Oxide Memristors”, IEEETransactions on Electron Devices 60, 2194-2202 (2013).

[9] W. Yi, et al., “Quantized Conductance coincides with State Instability and Excess Noise inTantalum Oxide Memristors”, Nature Communications, in press.

Date: 17/March/2017 – (friday) – Place: Sala 212 – Auditório do Departamento de Física- Time: 10h15min

RESULT OF THE SELECTION FOR HIRING OF FOREIGN VISITING PROFESSOR AT THE GRADUATE PROBRAM OF PHYSICS 

On the March 8^th, 2017, at 9:00am, in the Meeting Room of the Coordination of the Graduate Program in Physics, the Committee of the Selective Process for hiring of foreign visiting professor, referring to EDITAL N^o.39/DDP/ PRODEGESP/2016, formed through the ordinance no.08/PPGFSC/2017, of FEBRUARY 16th, 2017, in order to establish the final result of the selection process for hiring of foreign visiting professor in the scope of the Graduate Program of Physics. Based on the analysis of the documentation submitted by the candidates, the evaluation was carried out in accordance with the norms expressed in the mentioned EDITAL, giving a score of 10 (ten) for the highest score achieved and the scores of the other candidates calculated proportionally from their score obtained. The candidate with a final score equal to or greater than 7 (seven) was considered approved. Below is the result:

Final Result

The resources regarding the final result must be sent to the e-mail until 5:00 pm on March 11, 2017