Events Calendar

31 Jan
Pitt/CMU Special Colloquium: Shubhayu Chatterje (Berkeley)
Event Type

Lectures, Symposia, Etc.

Topic

Research

Target Audience

Undergraduate Students, Faculty, Graduate Students, Postdocs, Residents & Fellows

Tags

physics colloquia, CMU, Pitt-CMU

University Unit
Department of Physics and Astronomy
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Pitt/CMU Special Colloquium: Shubhayu Chatterje (Berkeley)

This is a past event.

Skyrmion pairing: a topological route to superconductivity

Abstract: Atomically thin Van der Waals materials have emerged as a highly versatile platform to advance our understanding of quantum matter driven by strong electron correlations. Recent experimental breakthroughs in stabilizing few-layered graphene structures with a “magic” relative twist between layers has led to the discovery of a wide variety of correlated states ranging from magnetism to superconductivity. Despite compelling experimental evidence for unconventional superconductivity, the glue which binds electrons into Cooper pairs remains a mystery. In this talk I will propose a novel resolution: the Cooper pairs are composed of electrically charged topological spin textures called “skyrmions,” rather than electrons. First proposed by Tony Skyrme to model baryons in particle physics, I will explain how their topological properties can give rise to superconductivity in an electronic model with purely repulsive interactions, and without recourse to phonons which are conventionally responsible for pairing.

Dial-In Information

Virtual Event.

Department members, see email for access.
Non-department members, contact paugrad@pitt.edu for access or to be added to the weekly newsletter.

Monday, January 31 at 3:35 p.m.

Virtual Event

Pitt/CMU Special Colloquium: Shubhayu Chatterje (Berkeley)

Skyrmion pairing: a topological route to superconductivity

Abstract: Atomically thin Van der Waals materials have emerged as a highly versatile platform to advance our understanding of quantum matter driven by strong electron correlations. Recent experimental breakthroughs in stabilizing few-layered graphene structures with a “magic” relative twist between layers has led to the discovery of a wide variety of correlated states ranging from magnetism to superconductivity. Despite compelling experimental evidence for unconventional superconductivity, the glue which binds electrons into Cooper pairs remains a mystery. In this talk I will propose a novel resolution: the Cooper pairs are composed of electrically charged topological spin textures called “skyrmions,” rather than electrons. First proposed by Tony Skyrme to model baryons in particle physics, I will explain how their topological properties can give rise to superconductivity in an electronic model with purely repulsive interactions, and without recourse to phonons which are conventionally responsible for pairing.

Dial-In Information

Virtual Event.

Department members, see email for access.
Non-department members, contact paugrad@pitt.edu for access or to be added to the weekly newsletter.

Monday, January 31 at 3:35 p.m.

Virtual Event

Topic

Research

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