Quantum-dot assisted spectroscopy of degeneracy-lifted Landau levels in graphene

Itai Keren, Tom Dvir, Ayelet Zalic, Amir Iluz, David LeBoeuf, Kenji Watanabe, Takashi Taniguchi and Hadar Steinberg ()
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Itai Keren: The Hebrew University
Tom Dvir: The Hebrew University
Ayelet Zalic: The Hebrew University
Amir Iluz: The Hebrew University
David LeBoeuf: Centre National de la Recherche Scientifique, EMFL, Université Grenoble Alpes, INSA Toulouse, Université Toulouse Paul Sabatier
Kenji Watanabe: National Institute for Material Science
Takashi Taniguchi: National Institute for Material Science
Hadar Steinberg: The Hebrew University

Nature Communications, 2020, vol. 11, issue 1, 1-9

Abstract: Abstract Energy spectroscopy of strongly interacting phases requires probes which minimize screening while retaining spectral resolution and local sensitivity. Here, we demonstrate that such probes can be realized using atomic sized quantum dots bound to defects in hexagonal Boron Nitride tunnel barriers, placed at nanometric distance from graphene. With dot energies capacitively tuned by a planar graphite electrode, dot-assisted tunneling becomes highly sensitive to the graphene excitation spectrum. The spectra track the onset of degeneracy lifting with magnetic field at the ground state, and at unoccupied excited states, revealing symmetry-broken gaps which develop steeply with magnetic field - corresponding to Landé g factors as high as 160. Measured up to B = 33 T, spectra exhibit a primary energy split between spin-polarized excited states, and a secondary spin-dependent valley-split. Our results show that defect dots probe the spectra while minimizing local screening, and are thus exceptionally sensitive to interacting states.

Date: 2020
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DOI: 10.1038/s41467-020-17225-1

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