Fall 2018

September 21, 2018 (Friday) 4:00-5:00p.m. Small Hall 111
Speaker: Jay D. Sau, University of Maryland
Host: E. Rossi
Title: Search for the new exotic quantum particle: Non-Abelian Majorana zero modes at semiconductor-superconductor interfaces
Abstract: Majorana zero modes are fermion-like excitations that were originally proposed in particle physics by Ettore Majorana and are characterized as being their own anti-particle. In condensed matter systems Majorana zero modes occur as fractionalized excitations with topologically protected degeneracy associated with such excitations. For over a decade the only candidate systems for observing Majorana zero modes were the non-Abelian  fractional quantum Hall state and chiral p-wave superconductors. In this talk, I will discuss a recent set of proposals for realizing Majorana zero modes in a large class of spin-orbit coupled, time-reversal symmetry broken superconducting systems. The simplicity of this class of systems has resulted in several experimental attempts, which have successfully observed preliminary evidence for the Majorana zero modes in the form of zero-bias conductance peaks and the fractional Josephson effect. Following this I will discuss future possibilities in terms of modifications to the experiments to help confirm the presence of Majorana zero modes through more dramatic signatures.

September 28, 2018 (Friday) 4:00-5:00p.m. Small Hall 111
Speaker: Danielle Speller, Yale
Host: C. Carone
Title: 
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October 5, 2018 (Friday) 4:00-5:00p.m. Small Hall 111
Speaker:
Gail McLaughlin, North Carolina State
Host:
M. Sher
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October 12, 2018 (Friday) 4:00-5:00p.m. Small Hall 111
Speaker: Andrey Antipov, Microsoft Station Q
Host: E. Rossi
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October 26, 2018 (Friday) 4:00-5:00p.m. Small Hall 111
Speaker: Tim Tait, UC Irvine
Host: M. Sher
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November 2, 2018 (Friday) 4:00-5:00p.m. Small Hall 111
Speaker: Prof. Fukuyama
Host: S. Sen
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November 9, 2018 (Friday) 4:00-5:00p.m. Small Hall 111
Speaker: P. Vahle, William & Mary Physics
Host: M. Kordosky
Title: New results from accelerator neutrino oscillation experiments
Abstract: Neutrino oscillations provide the first hints at physics beyond the standard model of particle physics.  Current and future neutrino experiments aim to further refine our understanding of neutrino mixing and reveal the remaining unknowns in the process.  Precision measurements in long-baseline accelerator experiments could help answer profound questions about the origin and evolution of our universe, including the assymetry of matter over antimatter.  The NOvA experiment at Fermilab uses a beam of neutrinos and two detectors separated by an 810 km baseline to observe muon neutrino disappearance and electron neutrino appearance.  These measurements have the potential to resolve the ordering of the neutrino masses, called the hierarchy, determine whether the mixing angle theta_23 is maximal, and if not in which octant it lies, and perhaps even hint at the violation of CP in the neutrino sector.  In this talk, I'll describe the current status of accelerator oscillation experiments seeking to answer these questions, and in particular present new results from the NOvA experiment.
November 16, 2018 (Friday) 4:00-5:00p.m. Small Hall 111
Speaker: Javad Shabani, NYU
Host: E. Rossi
Title: 
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