February 8
@
12:20 PM
–
1:20 PM
Materials Science Seminar Series presents Dr. Aaron Bostwick on Thursday, February 8, from 12:20 to 1:20 p.m. The seminar is hosted by Professor Paul Evans and Dan Rhodes and will be held in MS&E building room 265. Dr. Bostwick will be discussing Angle-resolved photoemission spectroscopy of 2D materials.
Abstract
Angle-resolved photoemission spectroscopy (ARPES) is the premier technique for the determination of the electronic bandstructure of solids, and has found wide application for many classes of materials, such as oxides, semiconductors, metals, and low-dimensional materials and surfaces. Among the important topics it addresses are the underlying many-body interactions that determine the ground and excited state functionalities of all materials.
MAESTRO, the Microscopic and Electronic Structure Observatory, is a synchrotron-based user facility for the ARPES measurements of in situ and ex situ prepared materials, including oxides, 2D van der Waals material, semiconductors, metals, and surfaces. With a combination of three ARPES microscopes with complementary spatial/energy/momentum resolutions, and in situ sample preparation (molecular beam epitaxy, pulsed laser deposition, and micro-mechanical sample transfer), we are able to examine the relationship between electron structure and topology with unprecedented spatial resolution. More gently we have added the capability to apply electric fields, currents, strain and femtosecond laser pulses to the samples in situ, enabling study of the electronic structure away from the ground state.
In this talk I will give an introduction to the ARPES technique, the MAESTRO facility and share some our recent work on the bandstructure and many-body interactions in 2D heterostructures of chalcogenides, graphene, and boron nitride and light induced metastable phases in 1T-TaS2.
Bio
Dr. Aaron Bostwick is a staff scientist at the Advanced Light Source synchrotron, at the Lawrence Berkeley National Laboratory (LBNL) in Berkeley, California, where he serves as leader of the MAESTRO beamline. Dr. Bostwick received his B.A. in physics from Carleton College in 1997, and his Ph.D. in physics from the University of Washington 2004. His research interests are primarily focused on the electronic structure and many-body physics of 2D materials.
Materials Science Seminar Series – Speaker Dr. Aaron Bostwick