CM Seminar - Doping a Mott Insulator and Unconventional Superconductivity in a Triangular Adatom Layer on a Silicon Surface

Event Date:
2020-10-22T14:00:00
2020-10-22T15:00:00
Event Location:
https://ubc.zoom.us/j/65784122083?pwd=U09vVXJMRzNLaTY3bmVXNEFJZ1k3UT09
Meeting ID: 657 8412 2083
Passcode: 113399
Speaker:
Steve Johnston, Professor at University of Tennessee, Knoxville
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Intended Audience:
Public
Event Information:

Abstract: The physics of doped Mott insulators is at the heart of some of the most exotic physical phenomena in materials research. The adsorption of a one-third monolayer of Sn atoms on a Si(111) surface produces a triangular surface lattice with half-filled dangling bond orbitals. In this talk, I will show how modulation hole doping of these dangling bonds unveils clear hallmarks of Mott physics [1], including a spectral weight transfer and the formation of dispersive quasiparticles at the Fermi level. I will also discuss the recent observation of superconductivity [2] in the most heavily hole-doped monolayers and evidence for an unconventional d+id chiral order parameter. These observations are remarkably similar to those made in complex oxide materials, including high-temperature superconductors, but highly extraordinary within the realm of conventional sp-bonded semiconductor materials. 

Add to Calendar 2020-10-22T14:00:00 2020-10-22T15:00:00 CM Seminar - Doping a Mott Insulator and Unconventional Superconductivity in a Triangular Adatom Layer on a Silicon Surface Event Information: Abstract: The physics of doped Mott insulators is at the heart of some of the most exotic physical phenomena in materials research. The adsorption of a one-third monolayer of Sn atoms on a Si(111) surface produces a triangular surface lattice with half-filled dangling bond orbitals. In this talk, I will show how modulation hole doping of these dangling bonds unveils clear hallmarks of Mott physics [1], including a spectral weight transfer and the formation of dispersive quasiparticles at the Fermi level. I will also discuss the recent observation of superconductivity [2] in the most heavily hole-doped monolayers and evidence for an unconventional d+id chiral order parameter. These observations are remarkably similar to those made in complex oxide materials, including high-temperature superconductors, but highly extraordinary within the realm of conventional sp-bonded semiconductor materials.  Event Location: https://ubc.zoom.us/j/65784122083?pwd=U09vVXJMRzNLaTY3bmVXNEFJZ1k3UT09 Meeting ID: 657 8412 2083 Passcode: 113399