Condensed Matter Seminars

Circuit Quantum Electrodynamics with a Spin-Orbit Qubit

Speaker: 
Jason Petta
Event Date and Time: 
Mon, 2012-05-07 14:00 - 15:00
Location: 
Hennings 318
Local Contact: 
Joshua Folk
Intended Audience: 
Graduate

Circuit quantum electrodynamics studies the interactions between the microwave field of a cavity and an artificial atom. We develop a circuit quantum electrodynamics architecture for spin qubits by coupling an InAs nanowire double quantum dot to a high quality factor superconducting cavity. A charge trapped in the double quantum dot interacts with the electric field of the cavity, resulting in a large vacuum Rabi frequency of ~ 35 MHz.

Intrinsic, anomalous Hall effect in a chiral multiorbital superconductor

Speaker: 
Edward Taylor (McMaster University)
Event Date and Time: 
Wed, 2012-05-09 13:00 - 14:00
Location: 
Henn 318
Local Contact: 
Jean-Sébastien Bernier
Intended Audience: 
Graduate

 

Signatures of Majorana fermions in hybrid superconductor-semiconductor nanowire devices

Speaker: 
Sergey Frolov
Event Date and Time: 
Thu, 2012-04-19 14:00 - 15:00
Location: 
Hennings 318
Local Contact: 
Joshua Folk
Intended Audience: 
Graduate

Majorana fermions are particles identical to their own antiparticles, first introduced by Majorana as hypothetical elementary particles. Subsequently they were predicted in topological superconductors as quasiparticles of zero energy and zero charge. We have implemented a recipe for Majoranas that has four simple ingredients: 1) one-dimensional wires 2) spin-orbit interaction 3) superconductivity and 4) magnetic field. I will present electrical measurements on nanowires grown from indium antimonide, a material with strong spin-orbit interaction.

Signatures of Majorana Fermions in Hybrid Superconductor-Topological Insulator Devices

Speaker: 
James Williams
Event Date and Time: 
Wed, 2012-03-28 14:00 - 15:15
Location: 
AMPEL 311
Local Contact: 
Joshua Folk
Intended Audience: 
Graduate

 

Isotropic Landau Levels of Relativistic and Non-Relativistic Fermions in 3D Flat Space

Speaker: 
Congjun Wu -- University of California, San Diego
Event Date and Time: 
Mon, 2012-03-19 14:00 - 15:00
Location: 
Hennings 318
Local Contact: 
Jean-Sébastien
Intended Audience: 
Graduate


The study of topological electron states started with the 2D quantum Hall effect in the external magnetic fields which arises from the Landau level quantization of the cyclotron motion of electrons. However, the usual LLs crucially relies on the planar structure, and it is not obvious to identify its 3D counterpart. On the other hand, the current study of 3D topological insulators is largely confined to lattice systems with Bloch-wave bands.

Is there a future for ferromagnetic semiconductors?

Speaker: 
Margaret Dobrowolska-Furdyna
Event Date and Time: 
Thu, 2012-04-12 14:00 - 15:00
Location: 
Hennings 318
Local Contact: 
Mona Berciu
Intended Audience: 
Graduate
GaMnAs is a ferromagnetic semiconductor which is considered to be an ideal candidate for spintronic applications. However, the bottleneck is that its highest critical temperature so far achieved is about 200 K.

Dissipative and quasi-thermal effects at long times after a quantum quench

Speaker: 
Aditi Mitra (NYU)
Event Date and Time: 
Fri, 2012-03-16 13:00 - 14:00
Location: 
Hennings 318
Local Contact: 
Jean-Sébastien Bernier, Fei Zhou
Intended Audience: 
Graduate

How an interacting many-particle system prepared in an initial state which is far from equilibrium evolves in time, and how it thermalizes if at all, is an important and open question which is also of experimental relevance. In this talk I will consider a system of interacting bosons that are initially out of equilibrium due to an interaction quench.

A view of electron-phonon coupling in the high-Tc cuprates and its interplay with the Coulomb interactions

Speaker: 
Steven Johnston (Leibniz Institute, Dresden)
Event Date and Time: 
Mon, 2012-03-12 12:00
Location: 
Hennings 318
Local Contact: 
Mona Berciu
Intended Audience: 
Graduate

A large number of viewpoints exist regarding the nature of the electron-phonon (e-ph) interaction in the high-Tc cuprates, covering the spectrum from primary pairing mediator in polaronic scenarios all the way to playing a negligible role. Recently this issue has been prominent in the context of a set of low-energy renormalizations observed in the electronic structure of the cuprates by various spectroscopies - such as angle-resolved photoemission spectroscopy - where the e-ph interaction has been proposed as a possible interpretation.

A Typology for Quantum Hall Liquids

Speaker: 
Boris Spivak (University of Washington)
Event Date and Time: 
Fri, 2012-02-17 14:00 - 15:00
Location: 
Hennings 318
Local Contact: 
Joshua Folk
Intended Audience: 
Graduate

The Pfaffian phase of electrons in the proximity of a half-filled Landau level is understood to be a p+ip superconductor of composite fermions. We consider the properties of this paired quantum Hall phase when the pairing scale is small, i.e. in the weak-coupling, BCS, limit, where the coherence length is much larger than the charge screening length. We find that, as in a Type I superconductor, the vortices attract so that, upon varying the magnetic field from its magic value at nu = 5/2, the system exhibits a Coulomb frustrated phase separation.

Effect of Strain and Dimensionality on the Properties of Manganites

Speaker: 
Carolina Adamo (Dep't of Materials Science and Eng., Cornell Universityi)
Event Date and Time: 
Thu, 2012-02-09 14:00 - 15:00
Location: 
Hennings 318
Local Contact: 
Andrea Damascelli
Intended Audience: 
Graduate

Strain and dimensional confinement can be used to tune magnetic and ferroelectric properties or enhance device performance. In epitaxial films, the different lattice spacing of an underlying substrate can be used to impose a biaxial strain. We have studied the effect of the substrate-induced biaxial strain on the electrical conductivity and magnetic properties of manganite compounds. Epitaxial (001) La0.7Sr0.3MnO3 thin films have been grown by reactive molecular-beam epitaxy (MBE) on single crystalline substrates, varying the substrate-induced biaxial strain from −2.3% to +3.2%.

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