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“ I am sure my fellow-scientists will agree with me if I say that whatever we were able to achieve in our later years had its origin in the experiences of our youth and in the hopes and wishes which were formed before and during our time as students. ”
- Felix Bloch
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Physics Conference Room, SB B326
Coffee starts at 12:00 PM and talk starts at 12:15 PM
Sep '19
Arkady Plotnitsky  -  Monday, September 16, 2019
ABSTRACT: Bohr never explained what he specifically meant, apart from the fact that complementarity reflects the fundamental difference between quantum physics and classical physics, based on the classical concepts of causality and determinism, closely connected to each other. This talk will introduce the concept of “quantum causality,” which divorces the idea of causality from determinism and explains why one may indeed be see complementarity in this way. This concept, however, is more general and allows one to offer a new perspective on the nature of quantum phenomena and the role of temporality and the arrow of time there, also in connection with quantum information theory, where similar conceptions of causality have been introduced in recent years in the work of C. Brukner, L. Hardy, and G. M. D’Ariano.
Sep '19
Oct '19
Paul Bourgade  -  Monday, October 7, 2019
ABSTRACT: I will survey properties of eigenstates of large random matrices, both in the Hermitian and non-Hermitian settings. In the Hermitian case, in the past few years universality of eigenvectors statistics (including delocalization) has been established, including for some models with short-range interactions. In the non-Hermitian case, our knowledge is much more limited so we will only consider the "integrable" Ginibre ensemble, exhibiting new statistics for the eigenvectors' overlaps.
Oct '19
Volker Sorger  -  Monday, October 21, 2019
ABSTRACT: Photonic technologies are at the forefront of the ongoing 4th industrial revolution of digitalization supporting applications such as virtual reality, autonomous vehicles, and electronic warfare. The development of integrated photonics in recent years enabled functional devices and circuits through miniaturization. However, fundamental challenges such as the weak light-matter integration have limited silicon and III-V-based devices to millimeter-scale footprints demanding about a million photons-per-bit.Overcoming these challenges, in the first part of this talk I will show how nanoscale photonics together with heterogeneous integration of emerging materials into foundry-based photonic chips enables strong nonlinearity, which we use to demonstrate attojoule and compact optoelectronics. Here I will discuss our recent devices demonstrating ITO-based MZI modulators, 2D-material excitonic photodetectors, and exotic epsilon-near-zero modes empowering record-efficient phase shifters for applications in data-comm, LiDAR, and photonic neural networks (NN). Further, I will show that the usually parasitic Kramers-Kronig relations of altering the optical index can be synergistically exploited delivering new modulator operations.

With Moore’s law and Dennard scaling now being limited by fundamental physics, the trend in processor heterogeneity suggests the possibility for special-purpose photonic processors such as NNs or RF-signal & image filtering. Here unique opportunities exist, for example, given by algorithmic parallelism of analog computing enabling non-iterative O(1) processors, thus opening prospects for distributed nonvan Neumann architectures. In the second part of this talk, I will share our latest work on analog photonic processors to include a) a feed-forward fully-connected NN, b) mirror symmetry perception via coincidence detection of spiking NNs, c) a Fourier-optics based convolutional processor with 1 PMAC/s throughputs at nanosecond-short delays for real-time processing, d) a photonic residue arithmetic adder, and e) mesh-based reconfigurable photonic & metatronic PDE solvers. In summary, heterogeneous photonics connects the worlds of electronics and optics, thus enabling new classes of efficient optoelectronics and analog processors by employing the distinctive properties of light.
Oct '19
Martin Bojowald  -  Monday, October 28, 2019
ABSTRACT: The big bang is often presented as the beginning of the universe. However, this statement, based on general relativity, follows from an extrapolation of the theory beyond its range of validity because it implies that the density and temperature of matter are infinite at the big bang.  Modern attempts to amend the theory by quantum space-time effects have led to alternative scenarios in which the universe may bounce back after a phase of collapse before the big bang. The physics involved, combining ultra-high density with abstract space-time properties, has not been constrained yet by observational tests, but it is subject to strong conceptual consistency conditions. This talk presents a possible physical picture of the big bang, based on several unexpected properties of space and time in quantum physics.
Nov '19
US/Middle East Conference on Photonics  -  Monday, November 4, 2019
ASRC - The Graduate Center, CUNY
PDFDownload PDF locationASRC Conference Room talk time9:00 am
ABSTRACT: This conference seeks to strengthen engagement between U.S., European, and Middle Eastern scientists by providing a forum for discussion of cutting edge photonics research.

Conference Outline

The conference will take place from Monday-Wednesday, November 4-6 at the Advanced Science Research Center (ASRC) on the campus of City College. Scientific sessions with invited talks will be held over the course of all three days.

On the first night of the conference (Monday, November 4), there will be a reception, early-career scientist symposium, and panel at The Graduate Center, CUNY:

Photonics 3.0: A Worldwide Quest for the Next Technology Revolution

6:30 p.m.

Participants: Nader Engheta (University of Pennsylvania), Mordechai Segev (Technion), and Federico Capasso (Harvard University).
Moderator: Andrea Alù (ASRC/The Graduate Center, CUNY)

Topics covered at the conference include:

› Metamaterials
› Topological insulators
› Biophotonics
› Plasmonics
› Nanooptics
› Integrated photonics
› Quantum optics
› Microwave photonics
› Random media
› Sensing
› Imaging
› Nonlinear optics
› Ultrafast spectroscopy
› Non-Hermitian photonics
Nov '19
Morrel Cohen  -  Monday, November 11, 2019
Looking back at seven decades in condensed matter physics
Rutgers University (Physics and Astronomy) and Princeton University (Chemistry and Chemical Biology)
ABSTRACT: I started research in solid state physics in 1950. I have witnessed it evolve into contemporary condensed matter physics over the ensuing seven decades. This talk focusses on several of the key events in the first three of those decades, the ‘50s, ‘60s, and ‘70s, that were fundamental to the emergence of many of the currently exciting areas active today. Being a theorist, I’ll emphasize the theoretical advances. Among those that I’ll of necessity touch on briefly are the introduction of topological reasoning, the growing role of spin-orbit coupling, explaining superconductivity, the discovery of disorder-induced localization, and the evolution of powerful electronic structure computation methods. Looking backward, 1950 was a time of great opportunity. Looking forward, 2019 is a time of even greater opportunity. Condensed matter physics has provided an excellent illustration of Vannevar Bush’s 1945 thesis “Science the Endless Frontier”.
Nov '19
Gabriele Grosso  -  Monday, November 18, 2019
Dec '19
Amir Ghetmiri  -  Monday, December 2, 2019
Si-based GeSn devices for mid-infrared optoelectronics
University of Arkansas at Pine Bluff
Dec '19
Mary Lanzerotti  -  Wednesday, December 4, 2019
PDFDownload PDF locationSB B326 coffee time12:00 pm talk time12:15 pm
ABSTRACT: This talk presents observations of the bursting of thick liquid films of molten steel following illumination of a thin vertical steel plate by a 1075-nm continuous-wave 1000W Ytterbium fiber. Molten steel formed in the illuminated region persists as a molten disk before a hole forms. Gravity is responsible for the formation of a dimple in the upper part of the molten disk and a bulge in the lower part. Images of the initial hole captured by a high-speed digital camera at room temperature conditions show that the hole enlargement is quite sudden, like a soap film popping. Following this, a single drop of molten forms and falls under the influence of gravity below the height of the laser beam, leaving behind a hole in the plate. Images of the initial hole captured by a high-speed digital camera show that the hole forms first in the top portion of the molten disk, not in the center.

The molten steel is modeled as liquid contained within a hoop with size of the final hole. 3D images produced by Surface Evolver, an interactive program for modelling liquid surfaces, indicate the presence of a dimple within the molten region near the location of first appearance of the hole, and a bulge in the molten region near the lower portion for a liquid with density and surface tension taking on values near the melting point of iron.