Exciton Manipulation in 2D TMDC Heterostructures
The Graphene Center at Chalmers (GCC) will organize a monthly GCC seminar on the recent advances in the field of graphene and 2D materials. Before the seminar (12-13 o'clock) there will be a light pizza snack in front of Kollektorn, which offers the possibility for (2D material) researchers at Chalmers to meet on a regular basis and to talk to the invited speaker.
Welcome to attend!
The first speaker is: Andras Kis, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
The discovery of graphene marked the start of research in 2D electronic materials which was expanded in new directions with MoS2 and other layered semiconducting materials. They have a wide range of promising potential applications, including those in digital electronics, optoelectronics and flexible devices. New opportunities are enabled by the band structure of transition metal dichalcogenides (TMDCs) with valence band edges at different locations in the momentum space which could be harnessed to build devices with operation relying on the valley degree of freedom for valleytronics and next-generation photonics. Long-lived interlayer excitons in van der Waals heterostructures based on TMDCs have recently emerged as a promising platform for valleytronics, allowing control over exciton diffusion length, energy and polarisation. I will show here how by using MoS2/WSe2 van der Waals heterostructures, we can realise transistor action, switching, confinement and control over diffusion length at room temperature in a reconfigurable potential landscape. Long-range moiré potentials in MoSe2/WSe2 heterostructures, on the other hand, offer the way to control both the polarisation and the wavelength of emitted light, allowing us to realize a tuneable polarisation switch.
The seminars will be on a monthly basis and will take place every last Monday in the month. Preliminary list of all the speakers:
26 November: Alessandro Tredicucci, University of Pisa, Italy
28 January: Claudia Backes, University of Heidelberg, Germany
25 February: Christopher Voisin, Paris, France
25 March: Annick Loiseau, France
29 April: Christoph Stampfer, Aachen, Germany
27 May: Wang Yao, Hong Kong
Kollektorn, lecture room,
22 October, 2018, 13:00
22 October, 2018, 14:00