Leena Aggarwal, Indian Institute of Science Education and Research, Mohali
Friday, May 26, 2017 - 10:30am
Allen Hall 321

In this talk, I am going to present some of the work that I have done during my PhD. In the first part I will mostly focus on building a low-temperature Andreev reflection spectroscopy probe (which is basically a simpler version of an STM). In the second part, I will briefly talk about the observation of a new phase of matter, tip-induced superconductivity (TISC), that emerges only under mesoscopic metallic point contacts on topologically non-trivial semimetals like a 3-D Dirac semimetal Cd3As2, and a Weyl semimetal, TaAs and comment on the possible mechanism that might lead to the emergence of such a surprising phase of matter. All these experiments were done using our home-built low-temperature probe.
If time permits, I will also talk about some experiments that we did using various scanning probe based microscopic techniques, e.g., piezo-response force microscopy (PFM) and ferroelectric lithography. I will show how certain “artifacts” can limit the application of PFM in the investigation of ferroelectric materials, and how, under certain circumstances, such “artifacts” can actually turn out to be useful.

References:
[1] L. Aggarwal, A. Gaurav, G. S. Thakur, Z. Haque, A. K. Ganguli & G. Sheet, Unconventional Superconductivity at Mesoscopic Point-contacts on the 3-Dimensional Dirac Semi-metal Cd3As2.” Nature Materials 15, 32 (2016).
[2] L. Aggarwal, S. Gayen, S. Das, R. Kumar, V. Sϋß, C. Shekhar, C. Felser & G....

May29
2:00pm
Summer Lectures: Phenomenology of Condensates and Superconductors
David Snoke will be giving six lectures at 2 PM on Mondays, May 29, June 5, June 19, June 26, July 3, and July 10, in G-10 Allen Hall. The basic phenomenology of condensates and superconductors, such as the Gross-Pitaevskii equation, quantized vorticity, the Meissner effect, Josephson junctions, SQUID’s, and so on will be covered. Students who have taken first-year graduate quantum mechanics should have no trouble with the material.
Summer 2017 Lectures Condensates Superconductors
David Snoke
University of Pittsburgh
Jun07
4:00pm
Polaron-Plasmon Superconductivity in Strontium Titanate
Strontium titanate is a bulk insulator that becomes superconducting at remarkably low carrier densities. Even more enigmatic properties become apparent at the strontium titanate/lanthanum aluminate (STO/LAO) interface and it is important to disentangle the effects of reduced dimensionality from the poorly-understood pairing mechanism. Recent experiments measuring the surface photoemission spectrum[1] and bulk tunneling spectrum[1] have found a cross-over, as a function of carrier density, from a polaronic regime with substantial spectral weight associated with strongly..
Summer 2017 Seminar Complex oxides Superconductivity
Alex Edelman
University of Chicago
More Calendars

Condensed Matter Physics Seminars

Physics Colloquia

Pitt Chemistry Seminar Series

CMU Chemistry Seminar Series

Pitt Engineering Seminar Series

CMU Engineering Seminar Series

Materials Supergroup