OctopusPY: Tool for Calculating Effective Mass from Octopus DFT Bandstructures
16 Aug 2021 | | Contributor(s):: Olivia M. Pavlic, Austin D. Fatt, Gregory T. Forcherio, Timothy A. Morgan, Jonathan Schuster
OctopusPY is a Python package supporting manipulation and analytic processing of electronic band structure data generated by the density functional theory (DFT) software Octopus. In particular, this package imports Octopus-calculated band structure for a given material and...
Quantum Turbulence in Trapped Bose-Einstein Condensate and Applications
09 Jul 2021 | | Contributor(s):: Vanderlei Salvador Bagnato
Observing the high moment component in the distribution allows us to verify its dependence by determining whether it is a non-thermal state. We detected in our experiment regions of excitation, where exponential (rather than Gaussian) dependence reveals the presence of non-thermalizing states.
Nonlinear Quantum Electrodynamics in Dirac Materials
29 Apr 2021 | | Contributor(s):: Yuli Lyanda-Geller
We show that similar nonlinear effects arise in Dirac materials at much lower fields, the magnitude of the effects is significant, and they can be observed in laboratory experiments. We predict and calculate the nonlinear electromagnetic effects and discuss compounds where the nonlinear...
Rydberg Polaritons: Driven-Dissipative Dynamics at Strong-Interaction Limit
28 Oct 2020 | | Contributor(s):: Hadiseh Alaeian
In this seminar, I will talk about the first- and second-order quantum dissipative phase transitions of a three-modecavity with a Hubbard interaction. In both types, there is a mean-field (MF) limit-cycle phase where the local U(1)-symmetry and the time-translational symmetry (TTS) of the...
Probabilistic Computing: From Materials and Devices to Circuits and Systems
07 Sep 2020 | | Contributor(s):: Kerem Yunus Camsari
In this talk, I will describe one such path based on the concept of probabilistic or p-bits that can be scalably built with present-day technology used in magnetic memory devices.
Exploring Synthetic Quantum Materials in Superconducting Circuits
30 Apr 2020 |
Superconducting circuits have emerged as a competitive platform for quantum computation, satisfying the challenges of controllability, long coherence and strong interactions. I will show our recent experiments to apply this toolbox to the exploration of strongly correlated quantum materials made...
Spatial Complexity in Correlated Electronic Systems
08 Jan 2020 | | Contributor(s):: Erica W. Carlson
I will discuss how understanding the formation of these patterns is vital to our understanding of electronic properties and to our eventual technological control of quantum matter. We have defined new paradigms for interpreting and understanding nanoscale electronic textures observed at the...
Covalent Defects of Carbon Nanotubes: New Class of High Purity, Indistinguishable Quantum Light Sources
02 Jan 2020 | | Contributor(s):: Han Htoon
Finally, I will report our most recent Hong-Ou-Mandel quantum optic experiment performed on quantum defects coupled to plasmonic cavities. We were able to realize indistinguishable single photon generation by exploiting the Purcell enhancement of the radiative decay rate of individual...
Many-body Expedition from Semiconductors to Atomic BECs
11 Dec 2019 | | Contributor(s):: Mackillo Kira
Specifically, I will overview how methods of semiconductor quantum optics relate to phenomena in strongly interacting Bose gas. This expedition focuses on the first unitary BEC experiment which demonstrated that a surprisingly large BEC fraction survived a quench from weak to unitary...
A ‘Coherent’ View of (some) Quantum Materials by Soft Resonant Elastic X-Ray Scattering
26 Sep 2019 | | Contributor(s):: Claudio Mazzoli
Electronic properties of quantum materials inherently depend on their time and space correlations. In my talk I will present some relevant cases investigated by coherent x-ray scattering in soft elastic regime.
Discovery of Spin-Vortex-Crystal Magnetic Order in Ni- and Co- Doped CaKFe4As4
20 Jun 2019 | | Contributor(s):: Paul C. Canfield
The discovery of CaFe2As2 in 2008 revealed the extreme member of the AEFe2As2 family AE = Ba, Sr, Ca. CaFe2As2 has the smallest c-lattice parameter, manifests a strongly coupled, first-order, structural/magnetic phase transition and can be coaxed into a collapsed tetragonal phase transition,...
After receiving his Ph.D. in Theoretical Physics at the Swiss Federal Institute of Technology, Gerardo Ortiz continued his career in the US, first, as a postdoctoral fellow at the University of...
Aharonov-Bohm Interference of Fractional Quantum Hall Edge Modes
20 Jun 2019 | | Contributor(s):: Michael J. Manfra
The braiding statistics of certain fractional quantum Hall states can be probed via interferometry of their edge states. Practical difficulties – including loss of phase coherence – make this a challenging task. We demonstrate the operation of a small Fabry-Perot interferometer in...
Topological Materials as Platforms for New Particles and Electromagnetic Responses
06 Jun 2019 | | Contributor(s):: Joel Moore
We then turn to how topological Weyl and Dirac semimetals can show unique electromagnetic responses; we argue that in linear response the main observable effect solves an old problem via the orbital moment of Bloch electrons, and how in nonlinear optics there should be a new quantized effect,...
Spin-Helical Particles: an Enabling Platform for Quantum Matter and Quantum Technologies
05 Jun 2019 | | Contributor(s):: Yong P. Chen
Spin is one of the most fundamental quantum properties of particles. In this talk I will describe our experimental studies of “spin-helical” particles (analogous to neutrinos with spin locked to the momentum, but for electrons and atoms) as a powerful platform to realize novel...
Looking for Fossils of the Big Bang in Molecular Spectra
05 Jun 2019 | | Contributor(s):: Eric A. Cornell
I will talk about precision measurement. We will see that the humble two-atom molecule should be thought of as an ultrahigh electric-field laboratory.
International Symposium of Quantum Science & Technology
01 Jun 2019 | | Contributor(s):: Yong P. Chen (organizer)
This symposium will review the current status and important recent international developments in quantum science and technology, and will help chart future directions for this hot-button topic.
Peculiar Corners of Hilbert Space where Strange States Lie
01 Jun 2019 | | Contributor(s):: Chris H Greene
This talk will summarize some of the peculiar states that have been found, which relate in some cases to Efimov physics, and in other cases to ultra-long-range Rydberg molecules, sometimes referred to as ‘trilobite’ or ‘butterfly’ molecules and their ghosts.
Suppression of Exciton Condensation in Copper-Doped TiSe2
24 May 2019 | | Contributor(s):: Melinda S. Rak
This work establishes M-EELS as a versatile technique for studying a new class of macroscopic quantum condensates in condensed matter.