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Upcoming Condensed Matter and Biological Physics Seminars

CM

Imaging currents in two-dimensional quantum materials - by Katja Nowack

Feb 24, 2017, 11:00 AM-12:00 PM

Rooms 202/204

Host: Britton Plourde | Contact: Tyler Engstrom, taengstr@syr.edu

Magnetic imaging is uniquely suited to the non-invasive imaging of current densities, particularly in two-dimensional devices. In this talk, I will showcase this approach by discussing measurements on HgTe quantum well devices in the quantum spin Hall (QSH) regime. In a nutshell, we scan a superconducting quantum interference device (SQUID) to obtain maps of the magnetic field produced by the current flowing in a device. From the magnetic image we reconstruct a two-dimensional current distribution with a spatial resolution of several microns. This allows us to directly visualize that most of the current is carried by the edges of the quantum well devices when tuned into their insulating gaps - a key feature of the QSH state. I will discuss routes towards improving the spatial resolution of the current images to sub-micron length scales through a combination of improved image reconstruction and smaller sensor sizes and outline opportunities for current imaging in a range of materials including graphene and magnetically doped topological insulators.

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TBD - by Chih-Kuan Tung

Mar 24, 2017, 11:00 AM-12:00 PM

Rooms 202/204

Host: Lisa Manning | Contact: Tyler Engstrom, taengstr@syr.edu

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TBD - by Irmgard Bischofberger

Mar 31, 2017, 11:00 AM-12:00 PM

Rooms 202/204

Host: Joseph Paulsen | Contact: Tyler Engstrom, taengstr@syr.edu

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TBD - by Paul Janmey

Apr 7, 2017, 11:00 AM-12:00 PM

Rooms 202/204

Host: Jen Schwarz | Contact: Tyler Engstrom, taengstr@syr.edu

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TBD - by Daniel Sussman

Apr 14, 2017, 11:00 AM-12:00 PM

Rooms 202/204

Host: Jen Schwarz | Contact: Tyler Engstrom, taengstr@syr.edu

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TBD - by Arshad Kudrolli

Apr 21, 2017, 11:00 AM-12:00 PM

Rooms 202/204

Host: Joseph Paulsen | Contact: Tyler Engstrom, taengstr@syr.edu

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TBD - by Madhav Mani

Apr 28, 2017, 11:00 AM-12:00 PM

Rooms 202/204

Host: Lisa Manning | Contact: Tyler Engstrom, taengstr@syr.edu

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TBD - by Pankaj Mehta

May 5, 2017, 11:00 AM-12:00 PM

Rooms 202/204

Host: Lisa Manning | Contact: Tyler Engstrom, taengstr@syr.edu