Public Research Seminar by Microelectronics Thrust, Function Hub, HKUST (GZ) - Manipulation and transport of dipolar excitons in a van der Waals heterostructure

7:00pm - 8:00pm
ZOOM (Zoom ID: 921 9260 9799 Password: 382648)

Excitons are optically generated quasi-particles in solids which are composed of electron-hole pairs bounded by Coulomb interactions. Excitonic devices are potentially well suited to the development of a promising alternative to electronics with lower energy, efficient photon transformation and photonic coupling.

 

By staking two transition metal chalcogenides (TMDCs) monolayers on top of each other, the heterostructure with a type-II band alignment enables the formation of long-lived interlayer excitons (IXs). This gives rise to a sizable permanent out-of-plane electrical dipole moment, which makes IXs a promising platform to realize electrically controlled excitonic devices.

 

In the research seminar, Dr. Sun will show by applying local electric fields on IXs, one can realize valley-polarized excitonic transistors with switching action, confinement and control over diffusion length in a reconfigurable potential landscape. What’s more, by using spatially and temporally resolved photoluminescence imaging, one could make a movie for the motion of IXs and observe the effect of repulsive dipole-dipole interactions on their dynamics. The dipolar interactions combined with the electrical control of interlayer excitons opens up appealing new perspectives for excitonic devices.

Event Format
Speakers / Performers:
Dr. Zhe SUN
Harvard University

Dr. Sun completed the Ph.D. degree from ETH Zurich in 2018. He worked on spin-photon interface in InGaAs self-assembled quantum dots in Prof. Atac Imamoglu’s group. In 2019, he joined Prof. Andras Kis group at EPFL Lausanne. His research focused on exciton transport in two-dimensional materials. From 2022, funded by Swiss National Science Foundation, he moved Prof. Suyang Xu’s group at Harvard University and Prof. Qiong Ma’s group at Boston College to study topological and magnetic materials. His research interests lie broadly in quantum optics and condensed matter physics.

Language
English
Recommended For
Faculty and staff
PG students
UG students
Organizer
Function Hub, HKUST(GZ)
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