Condensed Matter Seminars

Aspects of Ising-nematic quantum critical point

Speaker: 
Ipsita Mandal
Event Date and Time: 
Wed, 2016-05-25 14:00 - 15:00
Location: 
henn 304
Local Contact: 
Marcel Franz
Intended Audience: 
Graduate
We devise a renormalization group analysis for quantum field theories with Fermi surface to study scaling behaviour of non-Fermi liquid states in a controlled approximation. The non-Fermi liquid fixed points are identified from a Fermi surface in (m+1) spatial dimensions, while the co-dimension of Fermi surface is also extended to a generic value. We also study superconducting instability in such systems as a function of dimension and co-dimension of the Fermi surface.

TBA

Speaker: 
Peter Abbamonte, University of Illinois
Event Date and Time: 
Thu, 2016-05-26 11:00 - 12:00
Location: 
AMPEL 311
Local Contact: 
George Sawatzky
Intended Audience: 
Graduate

SEMINAR CANCELLED

Speaker: 
Alexander Weber-Bargioni, Molecular Foundry LBNL
Event Date and Time: 
Tue, 2016-05-17 14:30 - 15:30
Location: 
AMPEL 311
Local Contact: 
Sarah Burke
Intended Audience: 
Graduate

Electronic and Optoelectronic processes in matter are governed by the electronic structure and are well understood for most bulk material systems. Even individual nano building blocks made from these materials are reasonably well characterized. However, the effect of defects and specifically hierarchically ordered defects in quantum confined material systems on the electronic properties or the effect of order in heterogeneous nano building block assemblies on the resulting optoelectronic properties are largely uncharted territory.

Quantum criticality in heavy fermion metals

Speaker: 
Emilian Marius Nica, Department of Physics and Astronomy & Rice Center for Quantum Materials, Rice University
Event Date and Time: 
Thu, 2016-05-12 14:00 - 15:00
Location: 
Hennings 318
Local Contact: 
Marcel Franz
Intended Audience: 
Graduate

Heavy fermion systems provide a prototype-setting for the study of strongly-correlated electrons. Experiments on heavy-fermion metals such as CeCu6-xAux, YbRh2Si2, and CeRhIn5 have generated a great deal of interest in the general context of magnetic quantum phase transitions and associated non-Fermi liquid behaviors.

Transform & Diagonalize (T&D) approaches to electronic structure with applications to molecular spectroscopy

Speaker: 
Marcel Nooijen, Department of Chemistry, University of Waterloo
Event Date and Time: 
Fri, 2016-05-13 14:00 - 15:30
Location: 
Hennings 318
Local Contact: 
John Sous
Intended Audience: 
Graduate

One of the remaining open challenges for quantum chemistry concerns the routine calculation of molecular systems that require a multireference description, and the simulation of their spectroscopic properties. Notoriously are molecules containing one or more transition metal atoms. I will describe a recent coupled cluster approach that enables the calculation of a large number of electronic states

Tunable Electronic and Magnetic Properties of Rare-Earth Nickelate Heterostructures

Speaker: 
Matthias Hepting, MPI-FKF Stuttgart
Event Date and Time: 
Tue, 2016-04-05 13:30 - 14:30
Location: 
AMPEL 311
Local Contact: 
George Sawatzky
Intended Audience: 
Graduate

The rich phase diagram of transition metal oxides (TMO) such as rare-earth nickelates RNiO3

Entropy-Stabilized Oxides

Speaker: 
Jon-Paul Maria, North Carolina State University

Event Date and Time: 
Thu, 2016-03-24 14:00 - 15:00
Location: 
Hennings 318
Local Contact: 
George Sawatzky
Intended Audience: 
Graduate

The hunt for, and discovery of, new phases of matter is among the most exciting activities Materials Research. The excitement originates from the possibility of active property engineering and advanced technology opportunities that serve societal needs. As a community, we have been looking for a long time, and given the finite number of practical elements and their stable combinations, it is not clear how many are left to find especially if we limit ourselves to conventional tactics.

Transient Dynamics of d-Wave Superconductors after a Sudden Excitation

Speaker: 
Francesco Peronaci, International School for Advanced Studies (SISSA), Trieste, Italy
Event Date and Time: 
Thu, 2016-04-21 14:00 - 15:00
Location: 
Hennings 318
Local Contact: 
Ilya Elfimov
Intended Audience: 
Graduate

Motivated by recent ultrafast pump-probe experiments on high-temperature superconductors, we discuss the transient dynamics of a d-wave BCS model after a quantum quench of the interaction parameter. We find that the existence of gap nodes, with the associated nodal quasiparticles, introduces a decay channel which makes the dynamics much faster than in the conventional s-wave model.

Relaxation and thermalization in many-body systems coupled to different bosonic degrees of freedom

Speaker: 
J. Bonča, University of Ljubljana
Event Date and Time: 
Thu, 2016-04-07 14:00 - 15:00
Location: 
Hennings 318
Local Contact: 
Mona Berciu
Intended Audience: 
Graduate

In the first part I will briefly overview a fundamental study of the relaxation dynamics of a single hole in the two dimensional t-J model initially excited by a strong quench. Taking fully into account quantum effects we may follow the time-evolution of the system from a highly excited state until it reaches a steady state. Relaxation occurs on the time- scale of 10 f s due to inelastic scattering of a photo-excited carrier on spin excitations [1,2]. This mechanism can explain a finite raise of the scattering rate observed in ultrafast pump-probe experiments on cuprates [2].

In-situ Investigation of Growth and Superconductivity of Single-Layer FeSe Films on SrTiO3

Speaker: 
Jianfeng Ge (Shanghai Jiao Tong University)
Event Date and Time: 
Mon, 2016-03-07 14:00 - 15:00
Location: 
Ampel 311
Superconductivity with critical temperature above boiling point of nitrogen or even room temperature has been a pursuing goal of researchers ever since its discovery, because of its potential application in future electronic devices. Interface effects were found to induce superconductivity between insulating oxides, as well to enhance critical temperature of superconducting films, which matches the technology of device manufacturing perfectly.
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