Nanoscale control of phonon excitations in graphene
Hyo Won Kim,Wonhee Ko,JiYeon Ku,Insu Jeon,Donggyu Kim,Hyeokshin Kwon,Youngtek Oh,Seunghwa Ryu,Young Kuk,Sungwoo Hwang,Hwansoo Suh +10 more
TLDR
In this paper, the local phonon properties of graphene can be controlled at the nanoscale by tuning the interaction strength between graphene and an underlying Pt substrate, and the reduced interaction due to embedded Ar atoms facilitates electron-phonon excitations, further influencing phononassisted inelastic electron tunnelling.Abstract:
Phonons, which are collective excitations in a lattice of atoms or molecules, play a major role in determining various physical properties of condensed matter, such as thermal and electrical conductivities. In particular, phonons in graphene interact strongly with electrons; however, unlike in usual metals, these interactions between phonons and massless Dirac fermions appear to mirror the rather complicated physics of those between light and relativistic electrons. Therefore, a fundamental understanding of the underlying physics through systematic studies of phonon interactions and excitations in graphene is crucial for realising graphene-based devices. In this study, we demonstrate that the local phonon properties of graphene can be controlled at the nanoscale by tuning the interaction strength between graphene and an underlying Pt substrate. Using scanning probe methods, we determine that the reduced interaction due to embedded Ar atoms facilitates electron-phonon excitations, further influencing phonon-assisted inelastic electron tunnelling.read more
Citations
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Self-Powered Piezoionic Strain Sensor toward the Monitoring of Human Activities
TL;DR: A flexible wearable piezoionic strain sensor based on the ionic polymer membrane sandwiched between two conductive electrodes is developed and succeeded in monitoring the diverse human activities ranging from complex large scale multidimensional motions to subtle signals.
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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
TL;DR: 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.
Journal ArticleDOI
Nanobubbles at GPa Pressure under Graphene
Giovanni Zamborlini,Mighfar Imam,Laerte L. Patera,Laerte L. Patera,Tevfik Onur Menteş,N. Stojić,Cristina Africh,Alessandro Sala,Nadia Binggeli,Giovanni Comelli,Giovanni Comelli,Andrea Locatelli +11 more
TL;DR: Ab initio calculations show that Ar nanobubbles are subject to pressures reaching tens of GPa, their formation being driven by minimization of the energy cost of film distortion and loss of adhesion.
Journal ArticleDOI
Strain-tuning of the electronic, optical, and vibrational properties of two-dimensional crystals
TL;DR: Strain has been extensively studied in the literature for the purpose of tuning the properties of 2D materials and their properties on demand, among which the application of mechanical stresses, allowed by the incredible mechanical robustness and flexibility of these atomically thin materials, has been pursued as discussed by the authors.
Journal ArticleDOI
Heat transport in low-dimensional materials: A review and perspective
Zhi Ping Xu,Zhi Ping Xu +1 more
TL;DR: In this paper, the authors summarize recent progress in the understanding of heat transport process in low-dimensional materials, with focus on the roles of defects, disorder, interfaces, and the quantum-mechanical effect.
References
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