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A Quantum Simulator to Emulate Molecular Structure

Brian Kiraly

Assistant Professor at the University of Nottingham

Event Details:

Wednesday, June 7, 2023
11:30am - 12:30pm PDT

Location

Stanford University
McCullough Building, Room 115
476 Lomita Mall
Stanford, CA 94305
United States

This event is open to:

Alumni/Friends
Faculty/Staff
General Public
Students

Abstract: With increasingly sophisticated experimental systems, such as optically trapped cold atoms, lithographically defined quantum dots, or artificially assembled molecules on surfaces, our ability to quantitatively simulate solid state systems has led to remarkable advances in our understanding of the ways in which structure, dimensionality, and various types of interactions produce complex quantum states of matter. In this talk, I will detail the experimental development of a new quantum simulator based on an electrostatically sculpted two-dimensional electron gas on the surface of the semiconductor indium antimonide. Manipulating individual cesium atoms on the semiconductor’s surface with atomic precision, we are able to create artificial atoms hosting zero-dimensional bound states resembling atomic orbitals. As these states reside within the bulk band gap of the indium antimonide, they are weakly coupled to the substrate. We then show that the artificial atoms exhibit long-range coupling, leading to the formation of clearly distinguished bonding-antibonding orbitals. Finally, creating artificial “molecules” from these individual “atoms,” we show that the atomic states exhibit multi-orbital character and hybridise in a fashion nearly identical to molecules in nature. The experimental work was conducted in the Scanning Probe Microscopy Department at Radboud University, in collaboration with the Theory of Condensed Matter and Theoretical Chemistry Departments at Radboud.

Bio: Brian Kiraly is an Assistant Professor at the University of Nottingham (UoN). His research focuses on the atomic-scale characterisation of layered and atomically thin materials using scanning tunnelling microscopy. He received his Ph.D, from Northwestern University working in the group of Prof. Mark Hersam and Dr. Nathan Guisinger, developing novel approaches for the synthesis of two-dimensional materials. He then went on to Radboud University in the Netherlands as a Marie Curie Individual Fellow, studying two-dimensional transition metal chalcogenides. He then received a Dutch Veni Fellowship to study magnetic atoms on the surface of layered materials. His current work involves the synthesis and characterisation of magnetic monolayer materials and constructing artificial lattices on layered and non-layered crystals for quantum simulation, machine learning in materio, and atomic logic.

 

ZOOM: https://stanford.zoom.us/j/91315174347?pwd=S2c1YUd0dldldVNwVWNxNWZZaHZj…

 

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