Condensed Matter Seminars

Mapping the Calogero model onto the Anyon model

Speaker: 
Stéphane Ouvry, Université Paris Sud
Event Date and Time: 
Thu, 2018-09-27 14:00 - 15:00
Location: 
AMPL 311

I will first give a review of the thermodynamics of the anyon model and the Lowest Landau Level (LLL) anyon model (i.e. anyons coupled to a
strong  external magnetic field), in  relation to that of the Calogero model and Haldane fractional statistics. Then  I will construct  explicitly an
$N$-body kernel which  maps Calogero eigenstates onto anyonic eigenstates (arXiv: 1805.09899).
 

Exploring Quantum Magnetic Fluctuations in Low Dimensional Correlated Electron Systems

Speaker: 
Bill Gannon, from the University of Northwestern
Event Date and Time: 
Tue, 2018-05-29 11:00 - 12:00
Location: 
AMPL 311

Quantum magnetic fluctuations are one of the key concepts in modern condensed matter physics, and is a thread that ties together a vast array of topics, from the coherence of unconventional superconductivity to the entangled disorder of quantum spin liquids to name just two examples. In this talk, I will discuss why it is essential to understand quantum magnetic fluctuations in materials that host them and how we can use inelastic neutron scattering to probe these important phenomena.

Hierarchical Nanostructures from the Self-Assembly of Functional Soft Materials

Speaker: 
Zachary M. Hudson, Department of Chemistry, University of British Columbia, Canada
Event Date and Time: 
Thu, 2018-04-12 14:00 - 15:00
Location: 
AMPEL 311

While methods for molecular synthesis are now highly advanced, the preparation of nanoscale objects of controlled size, shape and structural organization remains a key objective in the field of nanotechnology.

Controlling real and virtual photons: from quantum forces to space propulsion

Speaker: 
Jeremy N. Munday, University of Maryland, College Park, MD
Event Date and Time: 
Thu, 2018-04-19 14:00 - 15:00
Location: 
AMPEL 311

Optoelectronic devices are used to detect and manipulate light for communications, sensing, solar power generation, etc. However, even in the dark (i.e. when no photons are present), there exist quantum fluctuations of electromagnetic fields (sometimes called virtual photons) that give rise to measurable effects. One such phenomenon is a force between two charge-neutral objects, known as the Casimir effect.

Optical tuning of electronic valleys

Speaker: 
Nuh Gedik from the Massachusetts Institute of Technology
Event Date and Time: 
Thu, 2018-03-29 14:00 - 15:00
Location: 
AMPEL 311

The recently discovered monolayer transition metal dichalcogenides (TMDs) are 2D crystalline semiconductors with unique spin-valley properties. They have a pair of valleys that, by time-reversal symmetry, are energetically degenerate. Lifting the valley degeneracy in these materials is of great interest because it would allow for valley specific band engineering. In this talk, I will show that off resonant, circularly polarized light can be used to lift the valley degeneracy by means of the optical Stark effect.

Customized low temperature measurements, studying Spin Qubits and Monopoles in Spin Ice

Speaker: 
Jan Kycia from the University of Waterloo
Event Date and Time: 
Thu, 2018-04-05 14:00 - 15:00
Location: 
AMPEL 311

Non-Equilibrium dynamics in conventional and unconventional superconductors (CANCELLED)

Speaker: 
Benedikt Fauseweh, Max Planck Institute for Solid State Research
Event Date and Time: 
Thu, 2018-03-22 14:00 - 15:00
Location: 
AMPEL 311

Due to perosnal reasons Benedikt Fauseweh will unfortunately be unable to join us for this CM-Seminar.

We hope to be able to re-schedule a visit for him at SBQMI at a later date. Thank you for your comprehension.

 

 

Status of the Search for Majorana Fermions in Semiconductor Nanowires

Speaker: 
Sergey Frolov, University of Pittsburgh
Event Date and Time: 
Thu, 2018-03-15 14:00 - 15:00
Location: 
AMPEL 311

Tunneling spectroscopy measurements on one-dimensional superconducting hybrid materials have revealed signatures of Majorana fermions which are the edge states of a bulk topological superconducting phase. We couple strong spin-orbit semiconductor InSb nanowires to conventional superconductors (NbTiN, Al) to obtain additional signatures of Majorana fermions and to explore the  topological phase transition. A potent alternative explanation for many of the recent experimental Majorana reports is that a non-topological Andreev state localizes near the end of a nanowire.

Exploring Novel Quantum States and Manipulating Different Quantum Degrees of Freedom in Two-Dimensional Crystals, Heterostructures and Nano-Metamaterials

Speaker: 
Nai-Chang Yeh, Department of Physics and Kavli Nanoscience Institute California Institute of Technology
Event Date and Time: 
Thu, 2018-02-15 14:00 - 15:00
Location: 
AMPEL 311

Recent advances in nanofabrication technology and in the development of two-dimensional (2D) crystals and heterostructures/interfaces of novel materials have enabled new possibilities to explore novel quantum states and manipulate different quantum degrees of freedom (e.g., spin, valley, symmetry, topology, etc.) in materials.

The interaction of magnetism and superconductivity, and the development of superconducting spintronics

Speaker: 
Mark Blamire, Department of Materials Science, University of Cambridge, UK
Event Date and Time: 
Thu, 2018-05-17 16:00 - 17:00
Location: 
AMPL 311

The discovery in 2010, using superconductor / ferromagnet / superconductor Josephson junctions, that it is possible to controllably create triplet Cooper pairs in which the electrons have parallel spins created the field of superconducting spin electronics (superspintronics) [1]. However, even if triplet pairing implies that supercurrents can carry spin, this is not in itself sufficient to create functioning superspintronic devices.  In parallel, a variety of other interactions between singlet superconductivity and magnetism have been actively explored.

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