(The talk will be given in English)

Speaker:  Dr. Anatoly Khina

School of Electrical Engineering, Tel Aviv University

 011 hall, Electrical Engineering-Kitot Building 

Monday, November 28^th, 2022

15:00 - 16:00

The Information Velocity of Packet-Erasure Links

Abstract

What is the maximal speed—the information velocity—at which information can propagate reliably in a network through a cascade of links? 

Information theory tells us what is the maximal rate of reliable communications through a small number of such links when delay is not important. However, if we want to communicate in real time, answering this question becomes much more challenging. In fact, even for the simple case of transmitting a single bit over a tandem of links, where each flips its input independently (across time & links), an answer was given only very recently.

In this talk, I will present some recent results for this problem for packet-based links with ACK signals. In particular, I will derive the information velocity for a causally arriving stream of packets, and determine the arrive-failure exponential decay rate below the information velocity.

No prior knowledge of information theory or queueing theory will be assumed.

Joint work with Elad Domanovitz & Tal Philosof.

Short Bio

Anatoly Khina is a faculty member in the School of Electrical Engineering, Tel Aviv University, Tel Aviv, Israel, from which he holds B.Sc. (summa cum laude, 2006), M.Sc. (summa cum laude, 2010), and Ph.D. (2016) degrees, all in Electrical Engineering. Parallel to his studies, he worked as an engineer in various roles focused on algorithms, software and hardware R&D. He was a Postdoctoral Scholar in the Department of Electrical Engineering, California Institute of Technology, Pasadena, CA, USA, from 2015 to 2018, and a Research Fellow at the Simons Institute for the Theory of Computing, University of California, Berkeley, Berkeley, CA, USA, during the spring of 2018. His research interests include information theory, communications, statistics, control theory, and signal processing.

He is a recipient of the Fulbright, Rothschild and Marie Skłodowska-Curie Postdoctoral Fellowships; Clore Scholarship; Trotsky Award; Weinstein Prize in signal processing; Intel award for Ph.D. research; and the first prize for outstanding research work in the field of communication technologies from the Advanced Communication Center's Feder Family Award program.

השתתפות בסמינר תיתן קרדיט שמיעה = עפ"י רישום שם מלא + מספר ת.ז. בטופס הנוכחות שיועבר באולם במהלך הסמינר

LMI Seminar

Magnetic Dipole Light-Matter Interactions in 2D Hybrid Organic/Inorganic Perovskites:

What Metamaterials Can Teach us About Real Materials

Prof. Jon Schuller

Electrical and Computer Engineering

University of California, Santa Barbara

Monday December  19^th,  2022

13:00-14:00

Light refreshments and drinks will be served at 12:30

Auditorium 011, Engineering Classroom Building,  Faculty of Engineering, Tel-Aviv University

Abstract:

The optical properties of materials are universally described within the electric dipole (ED) approximation—atomic-scale optical frequency light-matter interactions are assumed to arise solely from electric dipoles interacting with the electric field component of light. In fact, this inability of matter to interact with the magnetic-field component of light led to the advent of metamaterials and metasurfaces. In this talk, I describe my group’s recent discovery of atomic-scale optical magnetism in 2D Layered Hybrid Organic/Inorganic Pervoskites (2D HOIPs). First, I detail our use of momentum-resolved optical spectroscopy to demonstrate magnetic dipole (MD) light emission originating from self-trapped excitons [1,2]. I conclude by showing that 2D HOIPs are the only known materials to exhibit non-unity optical frequency magnetic permeabilities [3]. 
1] DeCrescent, R.A., Venkatesan, N.R., Dahlman, C.J., Kennard, R.M., Zhang, X., Li, W., Du, X., Chabinyc, M.L., Zia, R. and Schuller, J.A., 2020. Bright magnetic dipole radiation from two-dimensional lead-halide perovskites. Science advances, 6(6), p.eaay4900.

[2] DeCrescent, R.A., Du, X., Kennard, R.M., Venkatesan, N.R., Dahlman, C.J., Chabinyc, M.L. and Schuller, J.A., 2020. Even-Parity Self-Trapped Excitons Lead to Magnetic Dipole Radiation in Two-Dimensional Lead Halide Perovskites. ACS nano, 14(7), pp.8958-8968.

[3] DeCrescent, R.A., Kennard, R.M., Chabinyc, M.L. and Schuller, J.A., 2021. Optical-Frequency Magnetic Polarizability in a Layered Semiconductor. Physical Review Letters, 127(17), p.173604

Bio:

Jon A. Schuller graduated from UCSB with a B.S. degree in physics before completing a Ph.D. in Applied Physics at Stanford University. Jon joined the electrical and computer engineering department at UC Santa Barbara in 2012, and is currently a Full Professor. Jon’s research interests include reconfigurable photonics, semiconductor metasurfaces, and advanced spectroscopy of nanomaterials. He is the recipient of an AFOSR Young Investigator Award and NSF CAREER award