Article
Multidisciplinary Sciences
Mir Mohammad Sadeghi, Yajie Huang, Chao Lian, Feliciano Giustino, Emanuel Tutuc, Allan H. MacDonald, Takashi Taniguchi, Kenji Watanabe, Li Shi
Summary: The peculiar electron-phonon interaction in graphene heterostructures enables ultrahigh mobility, electron hydrodynamics, superconductivity, and superfluidity. A peak in the Lorenz ratio near 60 kelvin and its decrease with increased mobility are observed in degenerate graphene, indicating an unusual behavior. This experimental observation, combined with ab initio calculations and analytical models, suggests that broken reflection symmetry in graphene heterostructures can relax the selection rule for electron coupling with flexural phonons, contributing to the increase of the Lorenz ratio at intermediate temperatures.
Article
Chemistry, Physical
Jiwon Jeon, Youngjae Kim, J. D. Lee
Summary: Pseudospin, a fundamental quantum number in graphene, can be changed by the rotation of phonons. By observing the phonon satellite accompanying the linearly pumped electron to the upper Dirac cone, we found that pseudospin exhibits rotation, nonzero angular momentum, and Berry curvature. We also identified the phonon responsible for pseudospin rotation as an elliptically polarized phonon, which can induce chiral phonon excitation without circularly polarized pumping.
Article
Physics, Multidisciplinary
Zhongwei Dai, Zhaoli Gao, Sergey S. Pershoguba, Nikhil Tiwale, Ashwanth Subramanian, Qicheng Zhang, Calley Eads, Samuel A. Tenney, Richard M. Osgood, Chang-Yong Nam, Jiadong Zang, A. T. Charlie Johnson, Jerzy T. Sadowski
Summary: The study presents experimental evidence of electronic and optical interlayer resonances in graphene van der Waals heterostructure interfaces. Using spectroscopic mode of a low-energy electron microscope (LEEM) and Raman spectroscopy, researchers found an increase in the interlayer spacing of 30 degrees twisted bilayer graphene and observed a unique type of Fano resonance around the D and G modes of the graphene lattice vibrations. This robust Fano resonance is a direct result of quantum confinement and the interplay between discrete phonon states and the excitonic continuum.
PHYSICAL REVIEW LETTERS
(2021)
Article
Chemistry, Physical
Stavros Katsiaounis, Nikos Delikoukos, Antonios Michail, John Parthenios, Konstantinos Papagelis
Summary: We studied the effects of electron-phonon and phonon-phonon interactions on the linewidth of the G phonon in both unintentionally and intentionally doped polycrystalline chemical vapor deposited (CVD) graphene samples using conventional and time-resolved Raman spectroscopy. We found that the lifetime of the G phonon decreased approximately by 14% with increasing doping, contrary to the anticipated reduction in G phonon linewidth due to a decrement in electron-phonon contribution from first principles calculations. The CVD samples exhibited a decrease of approximately 30% in the electron-phonon coupling constant compared to exfoliated graphene samples. Additionally, the contribution of phonon-defect scattering to the G band linewidth was significant in CVD graphene samples due to their lower crystal quality compared to exfoliated graphene.
Article
Physics, Multidisciplinary
Cheng Tan, Davoud Adinehloo, James Hone, Vasili Perebeinos
Summary: The weak acoustic phonon scattering in graphene monolayer leads to high mobilities even at room temperatures. We identify the dominant role of shear phonon mode scattering on the carrier mobility in AB-stacked graphene bilayer, which is absent in monolayer graphene. The surface polar phonon scattering from a boron nitride substrate contributes significantly to the measured mobilities at elevated temperatures.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Andrew T. Pierce, Yonglong Xie, Seung Hwan Lee, Patrick R. Forrester, Di S. Wei, Kenji Watanabe, Takashi Taniguchi, Bertrand Halperin, Amir Yacoby
Summary: The passage discusses the ferromagnetic phase observed in the quantum Hall effect and the study of related magnon excitations. By measuring the electron compressibility under the influence of magnons, a reduction in the gap of the quantum Hall state is revealed. The analysis suggests injected magnons bind with electrons and holes to form skyrmions, allowing the extraction of free magnon density, magnon chemical potential, and average skyrmion spin.
Article
Chemistry, Physical
Chenjing Quan, Xiao Xing, Tingyuan Jia, Zeyu Zhang, Chunwei Wang, Sihao Huang, Zhengzheng Liu, Juan Du, Yuxin Leng
Summary: The charge transfer process in two-dimensional graphene/transition metal dichalcogenides heterostructures was investigated. The study revealed the correlation between the hot phonon bottleneck effect in graphene and the charge transfer process. The existence of interlayer charge transfer in the heterostructure and its dependence on pump fluence were confirmed.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Physical
Chenjing Quan, Xiao Xing, Tingyuan Jia, Zeyu Zhang, Chunwei Wang, Sihao Huang, Zhengzheng Liu, Juan Du, Yuxin Leng
Summary: In this study, the hot carrier transport in graphene/transition metal dichalcogenides heterostructures was investigated using optical pump and terahertz probe spectroscopy. The results revealed the relationship between charge transfer and pump fluence, providing insights into the mechanism for further exploration of optoelectronic devices.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Marten Duvel, Marco Merboldt, Jan Philipp Bange, Hannah Strauch, Michael Stellbrink, Klaus Pierz, Hans Werner Schumacher, Davood Momeni, Daniel Steil, G. S. Matthijs Jansen, Sabine Steil, Dino Novko, Stefan Mathias, Marcel Reutzel
Summary: This study investigates far-from-equilibrium many-body interactions using photoelectron spectroscopy and finds remarkable transient renormalizations of the quasiparticle self-energy due to non-equilibrium conditions. These observations can be explained by ultrafast scatterings between nonequilibrium electrons and strongly coupled optical phonons.
Article
Chemistry, Multidisciplinary
Zachariah Hennighausen, Jisoo Moon, Kathleen M. McCreary, Connie H. Li, Olaf M. J. van 't Erve, Berend T. Jonker
Summary: The assembly of 2D materials in van der Waals heterostructures offers opportunities in materials design and synthesis. In this study, we report the formation of interlayer exciton-phonon bound states in Bi2Se3/WS2 heterostructures. These bound states appear as evenly separated peaks in the WS2 excitonic photoluminescence spectrum, corresponding to the energy of the A(1)((3)) surface phonon in Bi2Se3. Our work enhances understanding of interlayer van der Waals interactions and facilitates the development of technologies for spintronics, valleytronics, and quantum computing applications.
Article
Physics, Multidisciplinary
Wen-Yu Shan
Summary: This paper systematically investigates the phonon dichroism in proximitized graphene and finds that it vanishes in the absence of spin-orbit coupling. Linear and circular phonon dichroism occur in the presence of specific spin-orbit coupling and exchange coupling, which can be distinguished by the behavior of phonon absorption.
Article
Chemistry, Multidisciplinary
Levente Mathe, Zoltan Kovacs-Krausz, Ioan Botiz, Ioan Grosu, Khadija El Anouz, Abderrahim El Allati, Liviu P. P. Zarbo
Summary: We theoretically analyze the phonon-assisted tunneling transport in a quantum dot connected to a Majorana bound state in a topological superconducting nanowire. We investigate the behavior of the current through the dot under different experimentally relevant parameters and the influence of electron-phonon coupling. The presence of electron-phonon coupling affects the current behavior similarly to the renormalized gate voltage. At large bias voltages, the current presents a dip or a plateau, depending on the size of the dot-Majorana coupling. Our results reveal the complex physics of quantum dot devices used to study Majorana bound states.
Article
Materials Science, Multidisciplinary
X. Yang, A. Jena, F. Meng, S. Wen, J. Ma, X. Li, W. Li
Summary: In this study, the effect of electron-phonon interaction on the lattice thermal conductivity of graphene was investigated using first-principles calculations. It was found that the indirect coupling between flexural acoustic phonons and electrons has a significant impact on thermal conductivity in graphene, particularly due to the dominance of normal processes. Additionally, an unusual minimum thermal conductivity was observed at a specific charge carrier density in graphene.
MATERIALS TODAY PHYSICS
(2021)
Article
Multidisciplinary Sciences
Hongyun Zhang, Changhua Bao, Michael Schuler, Shaohua Zhou, Qian Li, Laipeng Luo, Wei Yao, Zhong Wang, Thomas P. Devereaux, Shuyun Zhou
Summary: In this study, high resolution TrARPES measurements were used to investigate Kekule-ordered graphene. By resolving the self-energy effect and its dynamic changes, the study reveals the role of specific phonon modes in the ultrafast relaxation dynamics of graphene.
NATIONAL SCIENCE REVIEW
(2022)
Article
Chemistry, Physical
X. Chen, M-L Lin, X. Cong, Y-C Leng, X. Zhang, P-H Tan
Summary: This study provides a deeper understanding of the intrinsic phonon anharmonicity of heavily-doped graphene through exploring the T-dependent Raman spectra based on FeCl3-based stage-1 graphite intercalation compound (GIC), revealing that the contribution of phonon anharmonicity to Γ(G) decreases as the Fermi level (E-F) approaches the Dirac point. The results also show that the T dependence of Delta omega(G) is almost independent on E-F and qualitatively agrees with the theoretical result of pristine graphene.
Article
Materials Science, Multidisciplinary
A. A. Shylau, S. M. Badalyan, F. M. Peeters, A. P. Jauho
Article
Physics, Multidisciplinary
V. L. Grigoryan, S. M. Badalyan
JOURNAL OF CONTEMPORARY PHYSICS-ARMENIAN ACADEMY OF SCIENCES
(2010)
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Materials Science, Multidisciplinary
S. M. Badalyan, A. Matos-Abiague, G. Vignale, J. Fabian
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Materials Science, Multidisciplinary
M. M. Glazov, M. A. Semina, S. M. Badalyan, G. Vignale
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Materials Science, Multidisciplinary
S. M. Badalyan, F. M. Peeters
Article
Materials Science, Multidisciplinary
S. M. Badalyan, F. M. Peeters
Article
Materials Science, Multidisciplinary
S. M. Badalyan, A. Matos-Abiague, J. Fabian, G. Vignale, F. M. Peeters
Article
Materials Science, Multidisciplinary
Kh Shakouri, S. M. Badalyan, F. M. Peeters
Article
Materials Science, Multidisciplinary
J. -J. Zhu, S. M. Badalyan, F. M. Peeters
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Materials Science, Multidisciplinary
S. H. Zhang, W. Xu, S. M. Badalyan, F. M. Peeters
Article
Materials Science, Multidisciplinary
S. H. Zhang, W. Xu, F. M. Peeters, S. M. Badalyan
Article
Physics, Multidisciplinary
S. M. Badalyan, J. Fabian
PHYSICAL REVIEW LETTERS
(2010)
Article
Physics, Multidisciplinary
J. Zhu, S. M. Badalyan, F. M. Peeters
PHYSICAL REVIEW LETTERS
(2012)
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Physics, Multidisciplinary
S. M. Badalyan, A. P. Jauho
PHYSICAL REVIEW RESEARCH
(2020)
