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Portal > Offres > Offre UMR9001-REBRIB-004 - Postdoc sur la supraconductivite dans le graphene twistee (H/F)

Postdoc valley currents in graphene (H/F)

This offer is available in the following languages:
Français - Anglais

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General information

Reference : UMR9001-REBRIB-004
Workplace : PALAISEAU
Date of publication : Monday, July 27, 2020
Type of Contract : FTC Scientist
Contract Period : 24 months
Expected date of employment : 1 September 2020
Proportion of work : Full time
Remuneration : between 2695 and 3841 E bruts per month depending on experience
Desired level of education : PhD
Experience required : Indifferent

Missions

The first isolation of graphene, one atom thick layer of carbon atoms arrange in hexagons, in 2005 attracted a lot of attention given its remarkable characteristics: high carriers mobility, ambipolar behavior, great mechanical strength. Not long after this, other 2D layered materials were found to have also remarkable characteristics and host a large number of phenomena of condensed matter physics. A great technological achievement of our days is the stack of these 2D layers to form van der Waals (vdW) heterostructures [Nat. Nanotech 5, 722] and therefore combine the properties of each material to design materials with new properties [Nature 499, 419].
Contrary to conventional 2D materials, grown by molecular beam epitaxy, the layered vdW structures can be make of any combination of 2D materials, given that there are not restrictions of lattice parameter. Other degree of freedom of these heterostructures is the relative angular alignment between its layers, which can dramatically alter its fundamental properties. A remarkable example of this, predicted for certain vdW heterostructures, is the emergence of phases of matter where charge carriers flow without dissipation. In heterostructures of graphene crystallographically aligned with boron nitride (insulator isomorph to graphene), such a phase has been predicted. However, due to the scarcity of experimental tools to control the layer alignment the observations available remain inconclusive [Science 346, 448; Science adv. 4, eaaq0194].
During this postdoctoral appointment we propose to use a new technique to control the angular alignment between layers in a vdW heterostructure [Science 361, 690] to investigate the generation and control of electrical signals related to this phases of matter in graphene.

Activities

The successful candidates will participate actively in sample fabrication (assembly of vdW heterostructures, angular control of layers using an AFM, micro and nanofabrication processes) and electronic transport measurements at low temperatures.

Skills

- PhD in Physics or equivalent
- Experience in low temperature measurements
- Experience with micro and nano fabrication techniques for 2D materials is a bonus
- Good communication skills in English (written and spoken).

Work Context

C2N is located in the Saclay Plateaux in the south of Paris. The work will be done in the group PHYNANO, which specializes in physics and technology of nanostructures from fundamental to applications.

Constraints and risks

NA

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