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Straintronic control of correlations in twisted van der Waals heterostructures

Objective

Correlations and topology are the cornerstones of modern condensed matter physics, and their coexistence is believed to lead to novel quantum electronic devices with built-in information protection.
In the landmark discoveries of previous years it has been found that in 2D materials placed on top of each other at a magic rotation angle, correlated phases appear. In contrast to high-Tc materials, in twisted van der Waals materials correlation effects are coupled with topology and thanks to their gate tuneability the exploration of their phase diagram takes only days instead of years. This has led to the discovery of a multitude of correlated phases including correlated insulators, orbital magnetic, non-conventional superconducting and ferroelectric phases, etc. Despite the immense interest, the understanding of their behaviour at the microscopic level is limited, which calls for further experiments and novel experimental tools.
In this project we will implement techniques that are radically new in this field: hydrostatic pressure and mechanical strain to uncover the ground state properties of twisted graphene and transition metal dichalcogenide heterostructures. Since the interlayer coupling plays the dominant role, changing the distance of the layers with hydrostatic pressure has a dramatic effect on the band structure and the correlated phases that emerge. The symmetries of the system can be deterministically broken by strain patterns applied in-situ. This very timely project will lead to several breakthroughs including a) revealing the ground state of twisted bilayer graphene at different filling factors from the large set of competing phases, b) in-situ engineering of the topology of these systems, or c) tuning quantum phase transition between non-Fermi liquid phases. The highly challenging research concept relies on my unique background in sample fabrication, quantum transport under strain and pressure, and studies on correlated and topological systems.

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Keywords

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Programme(s)

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Topic(s)

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Funding Scheme

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HORIZON-ERC - HORIZON ERC Grants

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Call for proposal

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(opens in new window) ERC-2022-COG

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Host institution

BUDAPESTI MUSZAKI ES GAZDASAGTUDOMANYI EGYETEM
Net EU contribution

Net EU financial contribution. The sum of money that the participant receives, deducted by the EU contribution to its linked third party. It considers the distribution of the EU financial contribution between direct beneficiaries of the project and other types of participants, like third-party participants.

€ 1 939 000,00
Address
MUEGYETEM RAKPART 3
1111 BUDAPEST
Hungary

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Region
Közép-Magyarország Budapest Budapest
Activity type
Higher or Secondary Education Establishments
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Total cost

The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.

€ 1 939 000,00

Beneficiaries (1)

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