Vibrational Properties of h-BN and h-BN-Graphene Heterostructures Probed by Inelastic Electron Tunneling Spectroscopy
Suyong Jung,Minkyu Park,Jaesung Park,Tae-Young Jeong,Tae-Young Jeong,Ho-Jong Kim,Ho-Jong Kim,Kenji Watanabe,Takashi Taniguchi,Dong Han Ha,Chanyong Hwang,Yong-Sung Kim +11 more
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TLDR
Equipped with an external back gate, this work can also detect high-order coupling phenomena between phonons and plasmons, demonstrating that h-BN-based tunneling device is a wonderful playground for investigating electron-phonon couplings in low-dimensional systems.Abstract:
Inelastic electron tunneling spectroscopy is a powerful technique for investigating lattice dynamics of nanoscale systems including graphene and small molecules, but establishing a stable tunnel junction is considered as a major hurdle in expanding the scope of tunneling experiments. Hexagonal boron nitride is a pivotal component in two-dimensional Van der Waals heterostructures as a high-quality insulating material due to its large energy gap and chemical-mechanical stability. Here we present planar graphene/h-BN-heterostructure tunneling devices utilizing thin h-BN as a tunneling insulator. With much improved h-BN-tunneling-junction stability, we are able to probe all possible phonon modes of h-BN and graphite/graphene at Γ and K high symmetry points by inelastic tunneling spectroscopy. Additionally, we observe that low-frequency out-of-plane vibrations of h-BN and graphene lattices are significantly modified at heterostructure interfaces. Equipped with an external back gate, we can also detect high-order coupling phenomena between phonons and plasmons, demonstrating that h-BN-based tunneling device is a wonderful playground for investigating electron-phonon couplings in low-dimensional systems.read more
Citations
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Probing magnetism in 2D van der Waals crystalline insulators via electron tunneling.
Dahlia R. Klein,David MacNeill,Jose L. Lado,David Soriano,Efrén Navarro-Moratalla,Kenji Watanabe,Takashi Taniguchi,Soham Manni,Soham Manni,Soham Manni,Paul C. Canfield,Paul C. Canfield,Joaquín Fernández-Rossier,Pablo Jarillo-Herrero +13 more
TL;DR: Tuning through the layered magnetic insulator CrI3 as a function of temperature and applied magnetic field is reported, electrically detect the magnetic ground state and interlayer coupling and observe a field-induced metamagnetic transition.
Journal ArticleDOI
Electrical properties and applications of graphene, hexagonal boron nitride (h-BN), and graphene/h-BN heterostructures
TL;DR: Two-dimensional hexagonal boron nitride (h-BN) has similar lattice structure to graphene and has a lattice mismatch with graphene of less than 1.7%. At the same time, h-BN has an atomic level of flat surface, B atoms and N atoms saturated into the bond, which was considered the highest among the insulating substrates as discussed by the authors.
Journal ArticleDOI
Magnon-assisted tunnelling in van der Waals heterostructures based on CrBr3
Davit Ghazaryan,Mark Greenaway,Zihao Wang,V. H. Guarochico-Moreira,V. H. Guarochico-Moreira,Ivan J. Vera-Marun,Jun Yin,Yuanxun Liao,Sergey V. Morozov,Oleg Kristanovski,Alexander I. Lichtenstein,Mikhail I. Katsnelson,Freddie Withers,Artem Mishchenko,Laurence Eaves,Laurence Eaves,Andre K. Geim,Kostya S. Novoselov,Abhishek Kumar Misra,Abhishek Kumar Misra +19 more
TL;DR: In this article, the authors studied tunnelling through thin ferromagnetic chromium tribromide (CrBr3) barriers that are sandwiched between graphene electrodes, which could allow two-dimensional spintronic devices to be developed.
Journal ArticleDOI
Spectroscopic studies of atomic defects and bandgap renormalization in semiconducting monolayer transition metal dichalcogenides
Tae Young Jeong,Tae Young Jeong,Hakseong Kim,Sang-Jun Choi,Kenji Watanabe,Takashi Taniguchi,Ki-Ju Yee,Yong-Sung Kim,Suyong Jung +8 more
TL;DR: The authors locate the mid-gap states originating from single chalcogen-atom vacancies in four representative semiconducting monolayer films, and analyse their implications for the semiconductor properties of atomically thin TMDs through electron tunneling and optical spectroscopy measurements.
Journal ArticleDOI
Probing magnetism in 2D van der Waals crystalline insulators via electron tunneling
Dahlia R. Klein,David MacNeill,Jose L. Lado,David Soriano,Efrén Navarro-Moratalla,Kenji Watanabe,Takashi Taniguchi,Soham Manni,Soham Manni,Soham Manni,Paul C. Canfield,Paul C. Canfield,Joaquín Fernández-Rossier,Pablo Jarillo-Herrero +13 more
TL;DR: In this paper, the authors report tunneling through the layered magnetic insulator CrI3 as a function of temperature and applied magnetic field and electrically detect the magnetic ground state and interlayer coupling and observe a field-induced metamagnetic transition.
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