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[Audio] Purdue University Physics Seminars

by Joseph M. Cychosz

A collection of seminars present in either Purdue University Department of Physics' General Colloquia or Condensed Matter Seminar Series.

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Episodes

  1. Josephson Detection of Multiband Effects in Superconductors

    In this talk focus be given to the modification of conventional Josephson effects due to the loss of time reversal symmetry found to exist in proximity-induced Josephson junction of SnTe nanowires.

  2. Engineering Rashba Spin-Orbit Coupling for a Bose-Einstien Condensate

    I will describe our engineered Rashba spin-orbit coupling for a cold atomic gas giving non-trivial topology, without the underlying crystalline structure that conventionally yields integer Chern numbers.

  3. Portrait of a Black Hole & Beyond

    Dr. Bouman, who was part of the Event Horizon Telescope team that captured the first photograph of a black hole, will talk about the challenges of the project.

  4. Putting Maxwell’s Demon to Work on Cooling Atoms and Efficient Isotope Separation

    We are developing new approaches to the control of atomic motion, realizing the historic thought experiment of Maxwell’s demon exactly as envisioned by Maxwell in 1871. This toolbox of new methods is an alternative to laser cooling and evaporative cooling of atoms, with much better...

  5. The Eötvös Paradox: The Enduring Significance of Eötvös' Most Famous Experiment

    Here we summarize the key elements of this "Eötvös paradox," and suggest some possible paths to a resolution. Along the way we also discuss the close relationship between Eötvös and Einstein, and consider how their respective contributions may have been influenced...

  6. Search for Non-Newtonian Gravity with Optically-Levitated Microspheres

    The universal law of gravity has undergone stringent tests for a long time over a significant range of length scale, from an atomic scale to a planetary scale. Of particular interest is the short distance regime, where modifications to Newtonian gravity may arise from axion-like particles and…

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  7. Toward a Thinking Microscope: Deep Learning-Enabled Computational Microscopy and Sensing

    In this presentation, I will provide an overview of some of our recent work on the use of deep neural networks in advancing computational microscopy and sensing systems, also covering their biomedical applications.

  8. Suppression of Exciton Condensation in Copper-Doped TiSe2

    This work establishes M-EELS as a versatile technique for studying a new class of macroscopic quantum condensates in condensed matter.

  9. Soft Electronic and Microfluidic Systems for the Skin

    This talk describes the key ideas, and presents some of the most recent device examples, including wireless, skin-like electronic 'tattoos' for continuous monitoring of vital signs in neonatal intensive care, microfluidic/electronic platforms that can capture, store and perform...

  10. Nanoscale NMR Studies of Topological Insulators, Crystalline Insulators and Dirac Semimetals

    In this talk, we will review recent advances in experimental techniques to study the electronic and magnetic properties of such topological materials. Among the novel techniques, we shall discuss radioactive ion beam spectroscopy and nuclear magnetic resonance. Our group has...

  11. High-Precision Physics and Chemistry with Cold Molecules

    We show how a combination of optical-clock style molecular spectroscopy and modern quantum chemistry shed light on quantum mechanical aspects of basic chemical reactions and advance table-top fundamental physics in new directions.

  12. From Pseudogaps to Pair-Density Waves in Cuprate Superconductors

    I will present a fresh analysis of a large range of experimental characterizations, making the case for two pseudogaps: (1) a large pseudogap resulting from the competition between the energy of superexchange-coupled local Cu moments and the kinetic energy of doped holes; (2) a small pseudogap...

  13. Manipulating Strongly Interacting Individual Quanta: Photon Molecules and 51 Atomic Qubits

    I will discuss two applications: By coherently coupling light to Rydberg excitations in a dense atomic medium, we have realized a highly nonlinear optical medium where the interactions between individual photons are so strong that two photons can even form a bound state.

  14. Signatures of Nontrivial Topology in Weyl Semimetals and Fe-Based Superconductors

    In this talk I will outline our recent efforts to reveal non-trivial topology with nonlinear optics and tunneling spectroscopy. First I will focus on our efforts to use nonlinear optics to measure the Berry connection in the Weyl semimetal TaAs. Specifically using new FIB fabricated mesoscopic...

  15. The Life and Death of Turbulence

    In this presentation, I propose that turbulence is most fruitfully regarded as a problem in non-equilibrium statistical mechanics, and will show that this perspective explains turbulent drag behavior measured over 80 years, and makes predictions that have been experimentally tested in 2D...

  16. Superfluids of Light: Bose-Einstein Condensation of Polaritons

    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.

  17. Data-Driven Discovery of Governing Equations of Physical Systems

    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...

  18. Topological Superconductivity and Majorana Bound State in Fe-based Superconductors

    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...

  19. Quantum Hall Transitions: Exact Results, Conjectures, and Numerical Tests

    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...

  20. Indirect Dissociative Recombination of Light Ions

    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. It is...

  21. DFT Studies of Spin Orbit Coupling in Spintronics Materials

    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...

  22. Coherence Transfer in Manifolds of Molecular Rotational Levels: Strong Field Effects in the Microwave Region

    This talk will describe experiments that uncover and then seek to understand the physics behind the off-resonant coherences that are thereby produced.

  23. Novel III-Nitrides Materials for Infrared Optoelectronics: Growth, Structure and Properties

    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...

  24. From Driven Systems to Topological Quantum Machines: 2d Floquet and Topological Energy Pumping

    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...

  25. Quantum Effects in Electromagnetics and Computational Electromagnetics

    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. ...

  26. Q-systems: Discrete Integrability and Cluster Algebras

    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...

  27. Diffraction-Free Space-Time Wave Packets

    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...

  28. A Lightning Introduction to Non-equilibrium Statistical Physics

    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...

  29. Scaling Down the Laws of Thermodynamics

    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...

  30. Cavity Quantum Atom Optics: From Laser Cooled Atoms to Active Nano-Photonics

    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...

  31. Understanding and Optimizing Exploratory Hydrothermal Reactions

    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...

  32. Ultrafast Microscopy of Energy and Charge Transport

    In my talk, I will focus on our recent progress on visualization of exciton and charge transport in solar cell materials.

  33. Bimetric Theory of Fractional Quantum Hall States

    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...

  34. Spin Wave, Skyrmion, and Spin-Orbit Torque Devices

    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...

  35. Wide and Ultra-Wide Bandgap Semiconductors for Optoelectronics and Electronics

    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...

  36. Magnetic Ordering on the Surface of a Topological Crystalline Insulator

    Topological crystalline insulators (TCI's) are a class of materials which can support non-trivial band topology protected by crystalline symmetry. Using analytic and numerical methods, we study the effect of bulk magnetic impurities on a model of (Sn,Pb)Te alloys which are believed to be TCI’s in...

  37. Quantum Optical Simulation of Complex Physical Hamiltonians

    The rapidly expanding research activity on quantum computing is ultimately an outgrowth of the profound Feynman’s observation that only quantum systems are capable to efficiently simulate other quantum systems. The goal of quantum simulation is therefore to find simple quantum systems...

  38. The Hunt for Non-Abelian Statistics

    Search for non-Abelian statistics is driven both by the quest for a deeper understanding of nature and by prospects to eliminate the sensitivity of conventional quantum bits to the environment, opening a path for fault-tolerant quantum computing. The transformation of non-Abelions upon…

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  39. Novel Vertically Aligned Nanocomposite (VAN) Designes: Oxide-Oxide Systems and Beyound

    The talk focuses on a set of hybrid materials in vertically aligned nanocomposite form with unique functionalities for device applications, including magnetoresistance materials, multiferroics, exchange bias, metamaterials for plasmonics and photonics, high density magnetic storage, high...

  40. Forces That Govern Life: On the Way to Understanding Intermolecular Interactions

    This talk will overview our recent work on the Effective Fragment Potential (EFP) method. EFP is a model potential designed for describing non-covalent interactions. The absence of fitted parameters and a natural partitioning of the interaction energy into Coulomb, polarization, dispersion, and...

  41. Systems and Software for Quantum Computing

    In this talk, we define some of the system-level challenges facing the development of quantum computing systems as well as software-based approaches that can be used to overcome them. Following a brief overview of the state of the art, we present recent advances in the modeling and simulation of...

  42. Weakly Ionized Plasmas for Reconfigurable RF Systems

    The presentation discusses properties of ionized gases (plasmas), such as those used in fluorescent lights, from the standpoint of their potential application to tunable and reconfigurable radio-frequency (RF) electronics: antennas, resonators, filters, etc. Plasmas have important advantages in...

  43. How 10 Years of Education Research Invalidated 40 Years of My Assumptions -- a personal conversion

    I shall describe an on-campus pedagogy that helps students to become more expert. Then I’ll describe how research, development, online learning and MOOCs might be combined to spread better learning universally.

  44. Topological Spintronics: from the Haldane Phase to Spin Devices

    e provide a perspective on the recent emergence of “topological spintronics,” which relies on the existence of helical Dirac electrons in condensed matter. Spin‐ and angle‐resolved photoemission spectroscopy shows how the spin texture of these electronic states can be engineered using quantum...

  45. Photonic Structures with Topological Robustness: from Classical to Quantum

    In this talk, I demonstrate how similar physics can be observed for photons; specifically, how various quantum Hall Hamiltonians can be simulated in an optical platform. I report on the first observation of topological photonic edge state using silicon-on-insulator technology and our recent...

  46. Optical Hyperspace: Light in Metamaterials with Hyperbolic Dispersion

    The composites with opposite signs of the dielectric permittivity in two orthogonal directions, known as the hyperbolic metamaterials, represent a new "universality class" of optical media, with the light behavior which is qualitatively different from that in either metals or dielectrics....

  47. The Epithelial-Mesenchymal Transition Its role in metastasis? Can Theory Help Cancer Biology?

    In order to spread from the primary tumor to distant sites, cancer cells must undergo a coordinated change in their phenotypic properties referred to as the "epithelial-to-mesenchymal" transition. We have studied the nonlinear genetic circuits that are responsible for this cellular…

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  48. Quantum Measurement Backaction: From Atoms to Optomechanics

    The act of measurement has profound consequences on a quantum system. As such, the evolution of a quantum system can be influenced and even controlled through the continuous measurement of its properties. I will describe our studies on such measurement-induced dynamics in systems ranging from...

  49. Tailoring Biomass to Fit the Biofuels Pipeline

    Second-generation biofuels will be derived from lignocellulosic biomass using biological catalysts to convert the carbon in plant cell wall polysaccharides to ethanol or other biofuels. The Center for Direct Catalytic Conversion of Biomass to Biofuels (C3Bio) is a DOE-funded Energy Frontier...

  50. Prospects for Using Magnetic Insulators in Spintronics

    This presentation consists of two parts, which together will provide some perspective on the future of using magnetic insulators in spintronics. The first part will touch on the feasibility of using magnetic insulators, in particular, Y3Fe5O12 and BaFe12O19, to produce pure spin currents into...

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ABOUT THIS SHOW

A collection of seminars present in either Purdue University Department of Physics' General Colloquia or Condensed Matter Seminar Series.

HOSTED BY

Joseph M. Cychosz

Produced by nanoHUB.org

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[Audio] Purdue University Physics Seminars currently has 75 episodes available on PodParley. New episodes are automatically indexed when they're published to the podcast feed.

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A collection of seminars present in either Purdue University Department of Physics' General Colloquia or Condensed Matter Seminar Series.

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[Audio] Purdue University Physics Seminars has 75 episodes. Check the episode list to see recent publication dates and frequency.

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[Audio] Purdue University Physics Seminars is created and hosted by Joseph M. Cychosz.
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