[LA-SiGMA] Reminder - LASiGMA Seminar Today - Dr. Jiang Wei, 3:30pm at Louisiana State University

[shelley lee]

Dear All,

 

As a reminder, Dr. Jiang Wei of Tulane University will be giving a seminar
today, at 3:30pm in 1008B at the Digital Media Center at the Louisiana State
University. The title of his talk is "Nanostructure engineering: probing
phase transition and unexpected hydrogen storage in single-crystal vanadium
dioxide micro/nanobeam."

 

Abstract:

Many strongly correlated electronic materials have a domain structure that
greatly influences the bulk properties and obscures the fundamental
properties of the homogeneous material. Nanoscale samples, on the other
hand, can be smaller than the characteristic domain size, thus making it
possible to explore these fundamental properties in detail. Here, I will
describe some new aspects of the metal-insulator transition, studied in
single domain vanadium dioxide nanobeams, including supercooling of the
metallic phase by 50C, the new activation energy of insulating phase
consistent with the optical gap, and a connection between the
metal-insulator transition and the equilibrium carrier density in the
insulating phase. Our devices also provide a nanomechanical method for
determining the transition temperature, enable measurements on individual
metal-insulator interphase walls to be made, and allow general
investigations of phase transitions in quasi-onedimensional geometries. As a
direct application of such scheme, we discovered that vanadium dioxide
nanobeam can be reversibly intercalated with atomic hydrogen, which
stabilizes the strongly correlated metallic phase down to cryogenic
temperature. The maximum hydrogenation can reach HVO2. 

 

Biography:

Dr. Jiang Wei received his PhD (physics) from University of Washington at
Seattle in 2010. After that he was awarded Attwell-Welch Fellowship working
with Dr. Douglas Natelson as a postdoctoral researcher in Smalley Institute
of Rice University. In 2012, He joined the Department of Physic and
Engineering Physics at Tulane University as a tenure-tracked professor. His
current research focuses on electron transport and micro-spectroscopy study
on nanostructured strongly correlated materials and low dimensional
semiconducting materials.

 

Please note, due to technical difficulties this seminar will ONLY be
available via abobe connect. Please click on the link provided:
<http://connect.lsu.edu/la-sigma/> http://connect.lsu.edu/la-sigma/

 

UNO - Liberal Arts Building 234

LATech - PML 1015, Center for Instructional Technology, at the Wyly Tower

 

Please see attached flyer and let me know if you have any questions.

 

Regards,

Shelley Lee

Project Coordinator

225-578-0465

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