Forum DQMP: Van der Waals interfaces as artificial semiconductors (Evgeniy Ponomarev) / The Up to University project at Physiscope (Margherita Boselli)

26.06.2018 13:00 – 14:00

Van der Waals interfaces as artificial semiconductors
Evgeniy Ponomarev (group of Prof. Morpurgo)

Recent technical progress is demonstrating the possibility to stack together virtually any
combination of atomically thin crystals of van der Waals bonded compounds to form new types
of heterostructures and interfaces. As a result, there is the need to understand at a quantitative
level how the interfacial properties are determined by the properties of the constituent 2D
materials. We address this problem by studying the transport and opto-electronic response of
two different interfaces based on transition metal dichalcogenide monolayers, namely
WSe2/MoSe2 and WSe2/MoS2. By exploiting the spectroscopic capabilities of ionic liquid gated
transistors, we show how the conduction and valence bands of the individual monolayers
determine the bands of the interface, and we establish quantitatively the energetic alignment of
the bands in the different materials, as well as the magnitude of the interfacial band gap. The
results presented here show how van der Waals interfaces of two distinct 2D semiconducting
materials truly behave as artificial semiconductors.


The Up to University project at Physiscope
Margherita Boselli (group of Prof. Triscone)

Up to University (Up2U) is a 3-year EU-funded project started in January 2017 by a consortium
of European companies, research laboratories, and universities which aims to fill the gap
between high schools and higher education. The objective is to make tools and technology
commonly used in academia available to secondary school students.
Up2Universe is a platform developed by this project to simplify access, sharing and usage of
educational content among students, teachers and scientists.
The CERN-IT department is part of the Up2U consortium and, in summer 2017 it involved the
Physiscope in a pilot experiment. The goal of this test was to put the UptoUniverse pilot service
in practice by connecting it to an established educational program: Physiscope. A high-school
student in summer internship at CERN had the opportunity to use the Up2U scientific and
multimedia tools to extend the hands-on activities done at Physiscope.
In this presentation, after an introduction about the Physiscope, we will describe in details the
Up2U program, the results of this preliminary test, and we will discuss the possible integration
of Up2U services in some Physiscope activities.

Lieu

Bâtiment: Ecole de Physique

Auditoire Stückelberg

Organisé par

Département de physique de la matière quantique

Intervenant-e-s

Evgeniy Ponomarev, group of Prof. Morpurgo
Margherita Boselli , group of Prof. Triscone

entrée libre

Classement

Catégorie: Forum

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