Quantum Hall effect in graphene: Interface makes a difference

This video describes the physical process of interfacial charge order driven band reconstruction of Dirac fermion in a monolayer graphene, and hence the modification of the quantum Hall effect in the system.

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Quantum Hall edge states are known to be an ingredient for realizing quantum excitation states such as Majorana fermions when coupled to superconductivity – a route toward quantum computation. However, quantum Hall often requires extreme experimental conditions of very low temperature and high magnetic fields, which hold it back from practical applications. We discovered a new van der Waal hybrid system in which an unusually robust quantum Hall phase is realized, due to the coupling between graphene and an interfacial charge order in CrOCl.

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