EE Student Information

The Department of Electrical Engineering supports Black Lives Matter. Read more.

• • • • •

EE Student Information, Spring & Summer Quarters 19-20: FAQs and Updated EE Course List.

Updates will be posted on this page, as well as emailed to the EE student mail list.

Please see Stanford University Health Alerts for course and travel updates.

As always, use your best judgement and consider your own and others' well-being at all times.

AP483 & AMO Seminar presents "A glimpse into the dark world of excitons in 2D semiconductors Via time--resolved µ-ARPES"

Topic: 
A glimpse into the dark world of excitons in 2D semiconductors Via time--resolved µ-ARPES
Monday, October 28, 2019 - 4:00pm
Venue: 
Spilker 232
Speaker: 
Keshav Dani (Okinawa Institute of Science and Technology; Stanford Visiting Scholar)
Abstract / Description: 

About a decade ago, the discovery of monolayers of transition metal dichalcogenides opened a new frontier in the study of optically excited states in semiconductors, and related opto-electronic technologies. These materials exhibit a plethora of robust excitonic states, such as bright excitons at the K & K' valleys, momentum- and spin-forbidden dark excitons, and hot excitons. Optics-based experiments have revealed much about the bright excitonic states, but they remain largely unable to access their valley character, their scattering channels into other valleys within the Brilloin Zone, and the nature of the dark states in these valleys. Angle-Resolved Photoemission Spectroscopy (ARPES) based techniques would be ideal to access the valley character, and momentum-resolved scattering channels of photoexcited states in 2D semiconductors. But these are very challenging experiments to perform on the typically-available, micron-scale, 2D semiconductors. In today's talk, I will discuss the challenges involved, and progress made in my lab to date towards this aim. Any maybe – if time permits – we will end with an entertaining peek into the 'quantum psychology of dark excitons'!


 

AP 483 Optics and Electronics Seminar

Prof. Olav Solgaard, Organizer Fall 2019

 

AMO Seminar Sub-Series first Monday of each month)

Monica Schleier-Smith, Organizer Fall 2019

 

Bio:

Keshav Dani is currently an Associate Professor at the Okinawa Institute of Science and Technology (OIST), Graduate University in Okinawa, Japan. He joined OIST in Nov. 2011 as a tenure-track Assistant Professor after completing a Director's Postdoctoral Fellowship at the Center for Integrated Nanotechnologies at Los Alamos National Laboratory. Keshav graduated from UC Berkeley in 2006 with a PhD in Physics, where he explored the nonlinear optical response of the quantum Hall system under the supervision of Daniel Chemla at LBNL. Prior to his PhD, he obtained a BS from Caltech in Mathematics with a senior thesis in Quantum Information Theory under John Preskill and Hideo Mabuchi. His current research interests lie in the use of ultrafast techniques to study electron dynamics of two-dimensional materials and energy materials, develop optoelectronic applications in the terahertz regimes, and pursue interdisciplinary projects with OIST colleagues in neuroscience and art conservation.