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Cavity Quantum Atom Optics: From Laser Cooled Atoms to Active Nano-Photonics
08 Feb 2018 | Online Presentations | Contributor(s): Mahdi Hosseini
In this talk I present results from the MIT experiment demonstrating coherent manipulation of atomic and optical states based on cQED light-atom interactions. Moreover, I present our ongoing effort at Purdue to realize similar quantum phenomena at the single photon level using chip-scale...
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Wide and Ultra-Wide Bandgap Semiconductors for Optoelectronics and Electronics
06 Nov 2017 | Online Presentations | Contributor(s): Hongping Zhao
In this talk, novel heterostructures using closely-lattice matched GaN/ZnGeN2 will be presented with two examples: (i) a novel type-II quantum well design based on InGaN/ZnGeN2 heterostructures for high efficiency light emitter devices; and (ii) a coupled quantum well design based on GaN/ZnGeN2...
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Spin Wave, Skyrmion, and Spin-Orbit Torque Devices
27 Nov 2017 | Online Presentations | Contributor(s): Hyunsoo Yang
Nonreciprocity in spin waves is of great interest in both fundamental science and applications because it offers an extra knob to control the flow of waves for the technological fields of logics and switch applications. We show a high nonreciprocity in spin waves from Ta/Py bilayer systems with...
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Bimetric Theory of Fractional Quantum Hall States
29 Nov 2017 | Online Presentations | Contributor(s): Andrey Gromov
In this talk, I will motivate and describe the recently developed bimetric theory of fractional quantum Hall states. This effective theory includes the Chern-Simons theory that describes the topological properties of the fractional quantum Hall states and an action a la bimetric gravity that...
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Ultrafast Microscopy of Energy and Charge Transport
21 Dec 2017 | Online Presentations | Contributor(s): Libai Huang
In my talk, I will focus on our recent progress on visualization of exciton and charge transport in solar cell materials.
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Understanding and Optimizing Exploratory Hydrothermal Reactions
22 Jan 2018 | Online Presentations | Contributor(s): Alex Norquist
In this work, an alternative approach that uses machine-learning algorithms trained on reaction data to predict reaction outcomes for the crystallization of templated vanadium selenites is demonstrated. Archived ‘dark’ reactions, both failed and successful attempts at hydrothermal...
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Scaling Down the Laws of Thermodynamics
30 Apr 2018 | Online Presentations | Contributor(s): Christopher Jarzynski
Thermodynamics provides a robust conceptual framework and set of laws that govern the exchange of energy and matter. Although these laws were originally articulated for macroscopic objects, nanoscale systems often exhibit “thermodynamic-like” behavior – biomolecular motors...
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Diffraction-Free Space-Time Wave Packets
30 Apr 2018 | Online Presentations | Contributor(s): Hasan Esat Kondakci
In this talk, I will discuss a novel family of diffraction-free ultrafast light pulses that are localized both in time and one transverse dimension. Such pulses, dubbed space-time wave packets, are a result of ‘classically-entangled’ spatio-temporal spectra corresponding to more...
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A Lightning Introduction to Non-equilibrium Statistical Physics
30 Apr 2018 | Online Presentations | Contributor(s): Christopher Jarzynski
A brief and birds eye introduction to non-equilibrium statistical physics. This tutorial is organized around the 1st and 2nd laws of thermodynamics. It begins with brief review how the 1st and 2nd laws apply to macroscopic systems in the context of old fashion 19th century thermodynamics with...
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Q-systems: Discrete Integrability and Cluster Algebras
14 May 2018 | Online Presentations | Contributor(s): Rinat Kedem
I’ll introduce a family of remarkable recursion relations, originally found in the context of the Bethe ansatz of generalized Heisenberg modules and quantum groups. I will reconsider this system as a discrete integrable system in its own right, and show some of the remarkable properties...
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Quantum Effects in Electromagnetics and Computational Electromagnetics
20 Jun 2018 | Online Presentations | Contributor(s): Weng Cho Chew
In this talk, we begin by discussing quantum effects related to electromagnetics, such as spontaneous emission, Casimir force, quantum transport in devices, and quantum dissipations. Many of these effects have strong bearing on the future of quantum technology development. ...
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From Driven Systems to Topological Quantum Machines: 2d Floquet and Topological Energy Pumping
21 Jun 2018 | Online Presentations | Contributor(s): Gil Refael
In my talk I will show how applying multiple periodic drives to a quantum system could increase its dimensionality, and may even realize a multidimensional topological phases for zero-dimensional systems. Particularly, a spin-1/2 particle, driven by two elliptically-polarized light beams could...
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Novel III-Nitrides Materials for Infrared Optoelectronics: Growth, Structure and Properties
26 Sep 2018 | Online Presentations | Contributor(s): Oana Malis
I will describe our recent work to understand, model, and control the fundamental mechanisms of light absorption and electrical transport in nitride nanostructures. Special attention is given to the relationship between growth, structure, and optical properties in lattice-matched AlInN/GaN and...
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Coherence Transfer in Manifolds of Molecular Rotational Levels: Strong Field Effects in the Microwave Region
01 Oct 2018 | Online Presentations | Contributor(s): Timothy S. Zwier
This talk will describe experiments that uncover and then seek to understand the physics behind the off-resonant coherences that are thereby produced.
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Indirect Dissociative Recombination of Light Ions
29 Oct 2018 | Online Presentations | Contributor(s): Roman Čurík
Dissociative recombination (DR) is a process is which a free electron with a positive kinetic energy is captured by a molecular ion while breaking one or several chemical bonds,e− + AB+ → A + B .This is a very efficient chemical process, but is rarely described in chemical textbooks....
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DFT Studies of Spin Orbit Coupling in Spintronics Materials
29 Oct 2018 | Online Presentations | Contributor(s): Ruqian Wu
In this talk, I will discuss how to effectively imprint the exchange and spin orbit coupling (SOC) of adatoms and newly discovered van der Waals (vdW) two-dimensional (2D) magnetic materials into graphene and topological materials to realize the quantum spin Hall effect or the...
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Quantum Hall Transitions: Exact Results, Conjectures, and Numerical Tests
07 Nov 2018 | Online Presentations | Contributor(s): Ilya Gruzberg
In this talk I will review a number of recent results, analytical as well as numerical, on critical behavior near the integer quantum Hall transition and its cousins in other symmetry classes. The results include exact properties of the multifractal spectrum of critical wave functions obtained...
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Topological Superconductivity and Majorana Bound State in Fe-based Superconductors
12 Nov 2018 | Online Presentations | Contributor(s): Hong Ding
In this talk I will report our recent discoveries of topological superconductivity and Majorana bound state in Fe-based superconductor Fe(Te, Se). We have obtained convincing ARPES evidence of superconducting topological surface state of Fe(Te, Se) single crystal with Tc ~ 14.5K. By using...
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Data-Driven Discovery of Governing Equations of Physical Systems
16 Jan 2019 | Online Presentations | Contributor(s): J. Nathan Kutz
We introduce a number of data-driven strategies for discovering nonlinear multiscale dynamical systems and their embeddings from data. We consider two canonical cases: (i) systems for which we have full measurements of the governing variables, and (ii) systems for which we have incomplete...
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Superfluids of Light: Bose-Einstein Condensation of Polaritons
04 Feb 2019 | Online Presentations | Contributor(s): David W. Snoke
In this talk I will review some of this past work and present recent results, including oscillation of a polariton condensate in a one-dimensional ring trap, and polariton drag, in which electrons directly push photons in a wire.