Events Archive

Condensed Matter Seminar

Condensed Matter Seminar, Piers Coleman, Rutgers, "SmB6: Strange insulator at the brink of superconductivity?"

Mon, May 22, 2017, 1:15 pm

SmB6, an ultra-narrow gap insulator discovered more than 50 years ago, poses a paradox.  On the one hand, current theory and some experiments indicate that SmB6 is likely a topological insulator.

Special CM Seminar, Ahmed Omran, Harvard, "Quantum dynamics of strongly interacting atom arrays""

Wed, May 17, 2017, 1:30 pm

The realization and control of large-scale quantum systems is an exciting frontier of modern physical science. Using a novel cold atom platform, we trap single neutral atoms in an array of optical tweezers, and use real-time feedback to prepare defect-free chains of tens of atoms in one dimension with a high fidelity and repetition rate.

Condensed Matter Seminar, Sagar Vijay, MIT, "Fracton Topological Orders"

Mon, May 15, 2017, 1:15 pm

Fracton topological phases represent a new kind of three-dimensional topological order that is characterized by immobile, point-like topological excitations, and sub-extensive topological degeneracy.  Apart from providing an intriguing alternative to Bose or Fermi statistics in three dimensions, these phases are of interest as possibly robust...

Special Condensed Matter Seminar, G. Baskaran, Perimeter, "Bismuth - an Element of Surprise !"

Wed, Apr 26, 2017, 1:30 pm

Elemental semi metals, Bi, As, Sb, alpha-Sn and Graphehe which straddle an insulator and a metal are fascinating.
Bismuth, a member in this group has been investigated for more than a century, resulting in discovery of some well known effects in solid state physics. New phenomena have appeared in recent times.

CM Seminar, Zoran Habzibabic, Cambridge U., UK, "Quantum gas in a box"

Mon, Apr 17, 2017, 1:15 pm

For the past two decades ultracold Bose and Fermi atomic gases have been used with great success to study fundamental many-body physics.

Special Condensed Matter Seminar, Michael Gullans, NIST, "Designing Synthetic Quantum Matter using Interacting Photons"

Thu, Apr 13, 2017, 11:00 pm

The phases of matter we often encounter in nature occupy a small fraction of the total available states allowed by quantum mechanics.  Quantum information science (QIS) seeks to harness the seemingly inaccessible many-body states as a resource for computation, communication, and measurement.  At the same time, QIS raises new challenges for...

Condensed Matter Seminar, Mark Rudner, Bokr Institite, "Chiral plasmons without magnetic field"

Mon, Apr 10, 2017, 1:15 pm

In electronic systems, chirality is an interesting and useful property that expresses the system's ability to discriminate between forward and backward propagation along certain directions.  Edge states in the quantum Hall effect provide a classic example.  Recently, materials exhibiting chirality in the absence of an applied magnetic field...

Spec. Condensed Matter Seminar, Yakir Aharonov, Chapman Univ. "Novel properties of pre- and-post selected quantum systems"

Special Seminar: Dillon Wong, UC-Berkeley: "Imaging Relativistic Fermions in Simple 2D Potentials in Graphene”

Tue, Dec 13, 2016, 12:00 pm to 1:00 pm
Most physicists are familiar with how nonrelativistic quantum mechanics governs the behavior of particles in a Coulomb potential or a simple harmonic oscillator potential. But what happens when the particles become highly relativistic? Such questions used to lie mainly in the domain of high and intermediate energy physics.

Condensed Matter Seminar, Andrew Jordan, U of Rochester, "Continuously watched quantum systems - a stochastic path integral approach"

Mon, Dec 12, 2016, 1:15 pm to 2:15 pm
Recent theoretical and experimental progress in continuously monitored quantum systems has permitted the real-time tracking of the quantum state during the measurement process.

Condensed Matter Seminar, Andrea Liu, U. Penn, "Jamming: A tale of two rigidities"

Mon, Nov 21, 2016, 1:15 pm to 2:15 pm
When we first learn the physics of solids, we are taught the theory of perfect crystals. Only later do we learn that in the real world, all solids are imperfect. The perfect crystal is invaluable because we can describe real solids by perturbing around this extreme limit by adding defects.

CM Video Seminar, Brian Swingle, Harvard, "Measuring Quantum Information Scrambling"

Mon, Nov 14, 2016, 1:15 pm to 2:30 pm
Out-of-time-order correlation functions are of theoretical interest for diagnosing the scrambling of quantum information in black holes and strongly interacting quantum systems generally. I will describe a general protocol for measuring them which requires an echo-type sequence in which the sign of a many-body Hamiltonian is reversed.

Special CM Seminar, Dominik Zumbuhl, U. of Basel, "Edge state spectroscopy with a GaAs quantum wire"

Condensed Matter Seminar, Erik Nielsen, Sandia National Laboratories, "Silicon qubit device modeling and qubit characterization"

Tue, Nov 8, 2016, 11:00 am to 12:00 pm
Research in quantum computing is a still-growing field, fueled by interest in both it’s powerful applications and connection to fundamental science.  Qubits, the building blocks of future quantum computers, must both manipulate and protect the quantum information they hold – a task fraught with challenges.

CM Video Seminar, Andy Mackenzie, Max Planck, "Delafossite metals: ultra-high conductivity on two-dimensional triangular lattices"

Mon, Nov 7, 2016, 1:15 pm to 2:15 pm
The delafossites are a series of layered compounds with triangular lattices similar to that of NaCoO2 but with a different stacking sequence along the c axis. They are host to intriguing magnetic insulators and semimetals, as well as metals such as PdCoO2, PtCoO2, PdCrO2 and PdRhO2. The properties of these metals are remarkable.

Special CM Seminar, Arbel Haim, Weizmann, "Current aspects of topological superconductivity"

Wed, Oct 19, 2016, 1:30 pm to 3:00 pm
Abstract: Recent experiments have provided mounting evidence for the existence of Majorana bound states (MBSs) in condensed-matter systems. Until the long-term goal of braiding MBSs is achieved, one is prompted to ask: what is the next step in the study of topological superconductivity and MBSs? In my talk I will discuss two topics relating to...

CM Video Seminar, Andy Lucas, Harvard, "Fluid dynamics of electrons in graphene"

Mon, Oct 17, 2016, 1:15 pm to 2:30 pm
Although hydrodynamics is believed to be a universal limit for many interacting quantum systems, observing this regime is hard in ordinary metals. Thanks to recent developments in materials physics, graphene is a material where we should hope to observe multiple interesting hydrodynamic regimes.

Special CM Seminar, Victor Albert, Yale, "Drainage solutions for quantum systems "

Thu, Oct 13, 2016, 1:30 pm to 3:00 pm
Lindbladians, one of the simplest extensions of Hamiltonian-based quantum mechanics, are used to describe “drainage” (i.e., decay) and decoherence of a quantum system induced by the system's environment.

Condensed Matter Seminar, Nuh Gedik, MIT, "Optical manipulation of electronic bands using Floquet-Bloch States"

Mon, Oct 10, 2016, 1:15 pm to 2:30 pm
The coherent optical manipulation of solids is emerging as a promising way to engineer novel quantum states of matter. The strong time-periodic potential of intense laser light was predicted to generate hybrid photon–electron states named Floquet–Bloch states. In this talk, I will report on first experimental observation of these states in...

Condensed Matter Seminar, Chandra Varma, UCR, "Quantum Critical Fluctuations Leading to Strange Metals and Superconductors in 2D Metallic ..."

Mon, Oct 3, 2016, 1:15 pm to 2:30 pm
Models for metallic anti-ferromagnets map to the dissipative XY model as do XY ferromagnets, the superconductor-insulator transition, and the model forloop-current order in Cuprates. The spectral function of the quantum-critical fuctuations for this model in 2D for a range of parameters is determined by