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Physics Colloquium: "High Tc superconductivity in a single atomic layer of FeSe"

SpeakerJenny Hoffman, Harvard University
Date Feb 11, 2015
Time 4:00 pm  
Location 141 Loomis
Cost None
Sponsor Physics Department
Contact Stephanie Johansson
Phone 217-300-4241
Event type Seminar/Symposium
Views 21
Originating Calendar Physics - Colloquium

The remarkable discovery of superconductivity above 100K in a single atomic layer of FeSe (compared to the relatively mundane Tc=8K in bulk FeSe) prompts tremendous excitement and numerous pressing questions. What is the mechanism of the order-of-magnitude Tc enhancement in FeSe? What is the pairing symmetry? Could FeSe be a topological superconductor? What applications might one envision with such a 2D superconductor? Are there other interface superconductors just waiting to be discovered? I will review current experimental progress towards addressing these questions, then discuss our own growth (via molecular beam epitaxy) and imaging (via scanning tunneling microscopy) of single layer FeSe. We use quasiparticle interference to access the structure of filled and empty states, and to detect the emergence of a new electronic band slightly above the Fermi level. We use the amplitude of the scattering signal to explore the pairing symmetry.

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