Condensed Matter Seminars

Orbital and magnetic excitations in the spin-chain compound TiPO4

Speaker: 
Jochen Geck, Institute of Structural Physics, TU Dresden, Germany
Event Date and Time: 
Thu, 2017-03-02 14:00 - 15:00
Location: 
Hennings 318
Local Contact: 
George Sawatzky

We present high-resolution resonant inelastic x-ray scattering data as well many-body quantum chemistry calculations for the spin-chain compound TiPO4. This combined approach allows identifying the d-level electron configuration of Ti in this material, which is found to be at odds with canonical local ligand-field theory. Specifically, we find the ground state to be composed of an admixture of z2 and zx orbitals, highly unusual for six-fold coordinated d-metal sites.

Mott Insulator versus Bose glass in nanostructured Josephson junction chains

Speaker: 
Timothy Duty, EQuS - ARC Centre for Engineered Quantum Systems and School of Physics, University of New South Wales
Event Date and Time: 
Thu, 2017-02-16 14:00 - 15:00
Location: 
Hennings 318
Local Contact: 
Doug Bonn
Intended Audience: 
Graduate
The low-temperature states of bosonic condensates exhibit fundamental quantum
effects at the macroscopic scale such as supercurrents. The combined effects of
interaction and disorder in these can have drastic consequences, leading to the
Mott insulator and Bose-Anderson glass. The latter is thought to describe helium-4
in porous media, cold atoms in disordered optical potentials, disordered magnetic
insulators, and thin superconducting films.

Dopants and Charge Carriers in Colloidal Quantum Dots

Speaker: 
Daniel R. Gamelin, Department of Chemistry, University of Washington
Event Date and Time: 
Thu, 2017-05-18 14:00 - 15:00
Location: 
Hennings 318
Local Contact: 
Curtis Berlinguette
Intended Audience: 
Graduate

The physical properties of inorganic crystalline materials can be dramatically transformed by controlled introduction of impurities or other defects, without which most semiconductor technologies including transistors, diodes, and solar cells would not be possible. The development and characterization of high-quality doped inorganic crystals has consequently been a perennial research frontier. This talk will describe some of our group's recent research into the development and characterization of doped semiconductor quantum dots as new forms of matter at this research frontier.

What can defect bound states tell us? A case study of superconducting LiFeAs

Speaker: 
Shun Chi, Department of Physics & Astronomy, UBC
Event Date and Time: 
Mon, 2017-02-06 13:00 - 14:00
Location: 
AMPEL 311
Local Contact: 
Doug Bonn
Intended Audience: 
Graduate

What can defect bound states tell us? A case study of superconducting LiFeAs

Electronic Structure of Metal Halide Perovskite Surfaces and Interfaces

Speaker: 
Antoine Kahn, Princeton University
Event Date and Time: 
Thu, 2017-01-19 14:00 - 15:00
Location: 
Hennings 318
Local Contact: 
Sarah Burke

The formidable promises of a recently “re-discovered” class of semiconductors, i.e. the organic/inorganic halide perovskites (HOIP) such as methylamonium lead tri-iodide (MAPbI3), and the rapid and steady rise in device performance achieved with these materials over the past six years, have triggered a flurry of research all over the world. This talk reviews our efforts to understand key interfaces of these materials relevant to optoelectronic devices.

Chiral spin liquids in SU(N) fermionic Mott insulators with artifical gauge fields

Speaker: 
Miklos Lajko, Ecole Polytechnique Federale de Lausanne
Event Date and Time: 
Fri, 2017-01-20 13:00 - 14:00
Location: 
Hennings 309
Local Contact: 
Ian Affleck

With the recent progress towards achieving SU(N) symmetry with ultracold fermionic atoms [1], the investigation of the effective SU(N) Heisenberg model on various one- and two-dimensional lattices has become a very active field of research. The appearance of chiral phases in these systems was first proposed by Hermele et al. [2] showing that chiral phases may stabilize in a special large-N limit with increasing number of particles per site.

Exploratory Synthesis and Property Investigation of Novel Functional and Superconducting Materials

Speaker: 
Nikolai Zhigadlo, Department of Chemistry and Biochemistry, University of Bern
Event Date and Time: 
Mon, 2017-01-16 14:00 - 15:00
Location: 
AMPEL 311
Local Contact: 
Doug Bonn

In this talk I will provide some new insights into the material exploratory synthesis and the crystal growth of various intermetallic and oxide compounds, including high-temperature copper-based superconductors, magnesium diboride, pyrochlores, ternary perovskite-based superconductors, Fe-based pnictides, and two-dimensional van der Waals semiconductors.  The availability of high-quality single crystals has proved crucial in investigating their intrinsic magnetic, electronic and thermodynamic properties as well as in the realistic assessment of their potential for applications.

Sliced Basis Set Approach to Quantum Chemistry with DMRG

Speaker: 
Miles Stoudenmire, UC Irvine
Event Date and Time: 
Thu, 2017-01-26 14:00 - 15:00
Location: 
Hennings 318
Local Contact: 
Ian Affleck

Though the density matrix renormalization group (DMRG) is a powerful technique for strongly correlated problems in quantum chemistry, it is not without drawbacks. I will describe a new method for applying DMRG to quasi-1d chemical systems combining a grid approximation of the continuum along one direction with a basis set approximation along the other two directions. Combined with techniques for compressing the long-range interactions, this setup allows DMRG to scale much better for chemistry applications, allowing us to tackle long chains of atoms with modest computing resources.

'Ultrafast Optical Control of Complex Quantum Materials

Speaker: 
Stefan Kaiser, 4th Physics Institute, University of Stuttgart and Max-Planck Institute for Solid State Research
Event Date and Time: 
Thu, 2017-01-12 14:00 - 15:00
Location: 
Hennings 318
Local Contact: 
Sarah Burke
Intended Audience: 
Graduate

It is well known fact that various phase transitions in condensed matter can by triggered by external parameters such as temperature, pressure, electric field or magnetic field. Finding systems that show phase transitions triggered by external stimulation of light became a particular interesting field of research.

Symmetries in anyon systems

Speaker: 
Fiona Burnell, School of Physics and Astronomy, University of Minnesota
Event Date and Time: 
Thu, 2017-01-05 14:00 - 15:00
Location: 
Hennings 318
Local Contact: 
Marcel Franz
Intended Audience: 
Graduate

The past decade has seen a number of advances in our understanding of how phases of matter can be distinguished by phenomena other than spontaneous symmetry breaking, notably through global topological properties, such as emergent quasiparticles with fractional statistics known as anyons, or symmetry-protected gapless boundary states.  A particularly rich set of possibilities comes from combining these two, and studying the different possible ways that unbroken symmetries can act on systems of anyons.  I will explore several ways that symmetry can act in anyon systems, and show how studying

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