Article
Multidisciplinary Sciences
Bin-Bin Chen, Yuan Da Liao, Ziyu Chen, Oskar Vafek, Jian Kang, Wei Li, Zi Yang Meng
Summary: This study investigates the correlated electron phenomena in magic-angle twisted bilayer graphene, proposing a Mott-Hubbard perspective and identifying a quantum phase transition in the lattice model. The results not only clarify the mechanism of the quantum anomalous Hall state, but also provide an example of the topological Mott insulator in the strong coupling limit.
NATURE COMMUNICATIONS
(2021)
Article
Multidisciplinary Sciences
Peter Rickhaus, Folkert K. de Vries, Jihang Zhu, Elias Portoles, Giulia Zheng, Michele Masseroni, Annika Kurzmann, Takashi Taniguchi, Kenji Watanabe, Allan H. MacDonald, Thomas Ihn, Klaus Ensslin
Summary: This study discovered a correlated electron-hole state in double-bilayer graphene twisted to 2.37 degrees, where moire states retain much of their isolated bilayer character. This allows the generation of an energetic overlap between narrow isolated electron and hole bands with good nesting properties, leading to the formation of ordered states with reconstructed Fermi surfaces consistent with a density-wave state that can be tuned without introducing chemical dopants.
Article
Chemistry, Physical
Nathanael P. Kazmierczak, Madeline Van Winkle, Colin Ophus, Karen C. Bustillo, Stephen Carr, Hamish G. Brown, Jim Ciston, Takashi Taniguchi, Kenji Watanabe, D. Kwabena Bediako
Summary: Twisted bilayer graphene exhibits two-regime reconstruction mechanics based on twist angle, with applied heterostrain accumulating anisotropically in saddle-point regions to generate distinctive striped strain phases. Nanoscale spatial fluctuations in twist angle and uniaxial heterostrain were statistically evaluated, revealing the prevalence of short-range disorder in moire heterostructures. This study provides insights into the twist-angle-dependent electronic behavior and structural relaxation, disorder, and strain in moire materials.
Article
Chemistry, Multidisciplinary
Bixuan Li, Juntian Wei, Chunqiao Jin, Kunpeng Si, Lingjia Meng, Xingguo Wang, Yangyu Jia, Qianqian He, Peng Zhang, Jinliang Wang, Yongji Gong
Summary: In this study, an intercalation strategy using organic molecules was developed to fabricate high-quality and diverse twisted bilayer graphene (tBLG). By weakening the interlayer interaction and inducing slide or rotation of the topmost graphene layer, the proportion of tBLGs in the resulting dtBLG reached up to 84.4% for twist angles ranging from 0 degrees to 30 degrees, surpassing previous methods. The twist angle distribution was found to be non-uniform, concentrating in the ranges of 0-10 degrees and 20-30 degrees. This facile and rapid intercalation-based methodology provides a practical solution for studying angle-dependent physics and advancing the utilization of twisted two-dimensional materials.
Article
Nanoscience & Nanotechnology
Elias Portoles, Shuichi Iwakiri, Giulia Zheng, Peter Rickhaus, Takashi Taniguchi, Kenji Watanabe, Thomas Ihn, Klaus Ensslin, Folkert K. de Vries
Summary: In this study, a superconducting quantum interference device (SQUID) has been constructed in magic-angle twisted bilayer graphene (MATBG) with control over the superconducting phase difference through a magnetic field. The observation of magneto-oscillations of the critical current demonstrates the long-range coherence of superconducting charge carriers in the material, with potential applications in various devices.
NATURE NANOTECHNOLOGY
(2022)
Article
Multidisciplinary Sciences
Joe Finney, Aaron L. Sharpe, Eli J. Fox, Connie L. Hsueh, Daniel E. Parker, Matthew Yankowitz, Shaowen Chen, Kenji Watanabe, Takashi Taniguchi, Cory R. Dean, Ashvin Vishwanath, M. A. Kastner, David Goldhaber-Gordon
Summary: We present transport measurements of bilayer graphene with a 1.38 degrees interlayer twist. Although we do not observe correlated insulating states or band reorganization, we do observe several highly unusual behaviors in magnetotransport, including large and quadratic magnetoresistance for a large range of densities around half filling of the moire bands, as well as the splitting and bending of magnetoresistance minima corresponding to gaps between Landau levels as a function of density and field. These features appear to be a generic class of experimental manifestations of Hofstadter's butterfly and may provide insight into the emergent states of twisted bilayer graphene.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Multidisciplinary Sciences
Yu Saito, Fangyuan Yang, Jingyuan Ge, Xiaoxue Liu, Takashi Taniguchi, Kenji Watanabe, J. I. A. Li, Erez Berg, Andrea F. Young
Summary: The study explores the finite-temperature dynamics of spin and valley isospins in magic-angle twisted bilayer graphene, revealing a resistivity peak at high temperatures near a superlattice filling factor of -1, suggesting a Pomeranchuk-type mechanism. The data indicate the presence of a finite-field magnetic phase transition and a small isospin stiffness in the system.
Editorial Material
Chemistry, Physical
Wei Yang, Guangyu Zhang
Summary: By stacking few-layer WSe2 in proximity to twisted double bilayer graphene, researchers have solid evidence of superconductivity.
Article
Multidisciplinary Sciences
Yuan Hou, Zhaohe Dai, Shuai Zhang, Shizhe Feng, Guorui Wang, Luqi Liu, Zhiping Xu, Qunyang Li, Zhong Zhang
Summary: This study demonstrates that nanopockets in vdW materials can coalesce spontaneously into larger spaces which can be easily cleaned through mechanical methods, and that bilayer graphene interfaces exhibit excellent self-renewal phenomena in terms of moire patterns recovery after motion of contaminants.
NATURE COMMUNICATIONS
(2021)
Editorial Material
Chemistry, Multidisciplinary
Kanudha Sharda
Summary: The study describes a scalable method to synthesize twisted bilayer graphene, resulting in growth over the largest lateral surface areas reported so far, which has attracted significant interest in the field.
Article
Materials Science, Multidisciplinary
Frank Schindler, Oskar Vafek, B. Andrei Bernevig
Summary: The strong-coupling phase diagram of magic-angle twisted bilayer graphene predicts exact one-particle charge +/- 1 gapped excitations above the ferromagnetic ground states. In this study, the trion bound state is identified as the lowest charge +1 overall excitation under certain conditions.
Article
Multidisciplinary Sciences
Myungchul Oh, Kevin P. Nuckolls, Dillon Wong, Ryan L. Lee, Xiaomeng Liu, Kenji Watanabe, Takashi Taniguchi, Ali Yazdani
Summary: Recent studies on magic-angle twisted bilayer graphene (MATBG) have shown that the superconductivity in MATBG may not be described by the conventional BCS theory, but rather resembles a non-BCS mechanism due to the large density of states in its flat bands. This suggests that the pairing mechanism in MATBG may be unconventional and different from that of conventional superconductors.
Article
Engineering, Mechanical
Tawfiqur Rakib, Pascal Pochet, Elif Ertekin, Harley T. Johnson
Summary: We observe a helical dislocation network accompanied by large out-of-plane deformation in twisted bilayer graphene (tBLG). By atomistic calculations, we demonstrate two distinct out-of-plane deformation modes, a breathing mode with small deformation and a bending mode with significantly larger corrugation. The out-of-plane deformation is caused by inhomogeneous interlayer coupling resulting from the periodic stacking order of the tBLG moire superlattice.
EXTREME MECHANICS LETTERS
(2023)
Article
Physics, Multidisciplinary
Dumitru Calugaru, Nicolas Regnault, Myungchul Oh, Kevin P. Nuckolls, Dillon Wong, Ryan L. Lee, Ali Yazdani, Oskar Vafek, B. Andrei Bernevig
Summary: This article analytically computes the scanning tunneling microscopy (STM) signatures of integer-filled correlated ground states of the magic angle twisted bilayer graphene (TBG) narrow bands and assesses the possibility of Kekule distortion (KD). The results show that coupling the two opposite graphene valleys does not always result in KD.
PHYSICAL REVIEW LETTERS
(2022)
Article
Physics, Multidisciplinary
Minhao He, Yuhao Li, Jiaqi Cai, Yang Liu, K. Watanabe, T. Taniguchi, Xiaodong Xu, Matthew Yankowitz
Summary: The study reveals that spontaneous symmetry breaking plays a crucial role in the correlated insulating and metallic states in twisted double bilayer graphene, which can be tuned by both the twist angle and an external electric field. The metallic states exhibit abrupt drops in resistivity as temperature decreases, suggesting that spontaneous symmetry breaking is the origin of the abrupt resistivity drops, while nonlinear transport seems to be due to Joule heating. These findings imply that similar mechanisms may be relevant across a broader class of semiconducting flat band van der Waals heterostructures.
Article
Chemistry, Physical
L. Dellieu, E. Lawaree, N. Reckinger, C. Didembourg, J. -J. Letesson, M. Sarrazin, O. Deparis, J. -Y. Matroule, J. -F. Deparis
Article
Chemistry, Multidisciplinary
Michael Lobet, Michael Sarrazin, Francesca Cecchet, Nicolas Reckinger, Alexandru Vlad, Jean-Francois Colomer, Dan Lis
Article
Materials Science, Multidisciplinary
Louis Dellieu, Olivier Deparis, Jerome Muller, Branko Kolaric, Michael Sarrazin
Article
Astronomy & Astrophysics
Michael Sarrazin, Guillaume Pignol, Jacob Lamblin, Fabrice Petit, Guy Terwagne, Valery V. Nesvizhevsky
Article
Physics, Multidisciplinary
Louis Dellieu, Olivier Deparis, Jerome Muller, Michael Sarrazin
PHYSICAL REVIEW LETTERS
(2015)
Article
Astronomy & Astrophysics
Michael Sarrazin, Guillaume Pignol, Jacob Lamblin, Jonhathan Pinon, Olivier Meplan, Guy Terwagne, Paul-Louis Debarsy, Fabrice Petit, Valery V. Nesvizhevsky
Article
Physics, Nuclear
Coraline Stasser, Michael Sarrazin
INTERNATIONAL JOURNAL OF MODERN PHYSICS A
(2019)
Article
Physics, Nuclear
Michael Sarrazin, Coraline Stasser
INTERNATIONAL JOURNAL OF MODERN PHYSICS A
(2020)
Article
Physics, Particles & Fields
Coraline Stasser, Guy Terwagne, Jacob Lamblin, Olivier Meplan, Guillaume Pignol, Bernard Coupe, Silva Kalcheva, Steven Van Dyck, Michael Sarrazin
Summary: MURMUR is a new experiment designed to constrain neutron-hidden neutron transitions in braneworld scenarios or mirror matter models, with the aim of enhancing detection efficiency and using regenerating materials. The experiment at the BR2 reactor has provided a new limit on the neutron swapping probability, improving upon previous experiments despite lower hidden neutron generation efficiency.
EUROPEAN PHYSICAL JOURNAL C
(2021)
Article
Physics, Nuclear
Coraline Stasser, Michael Sarrazin
INTERNATIONAL JOURNAL OF MODERN PHYSICS A
(2020)
Article
Physics, Applied
Michael Sarrazin, Ismael Septembre, Anthony Hendrickx, Nicolas Reckinger, Louis Dellieu, Guillaume Fleury, Christian Seassal, Radoslaw Mazurczyk, Sebastien Faniel, Sabrina Devouge, Michel Voue, Olivier Deparis
JOURNAL OF APPLIED PHYSICS
(2020)
Article
Physics, Multidisciplinary
H. Almazan, L. Bernard, A. Blanchet, A. Bonhomme, C. Buck, P. del Amo Sanchez, I. El Atmani, L. Labit, J. Lamblin, A. Letourneau, D. Lhuillier, M. Licciardi, M. Lindner, T. Materna, O. Meplan, H. Pessard, G. Pignol, J. -s. Real, J. -s. Ricol, C. Roca, R. Rogly, T. Salagnac, M. Sarrazin, V. Savu, S. Schoppmann, T. Soldner, A. Stutz, M. Vialat
Summary: This study reported a new experimental constraint on the probability of neutron conversion into a hidden neutron, setting a limit of p < 3.1 x 10-11 at a 95% confidence level. This highlights the potential of short-baseline neutrino experiments as competitive means to search for hidden neutrons.
PHYSICAL REVIEW LETTERS
(2022)
Proceedings Paper
Materials Science, Multidisciplinary
Louis Dellieu, Garin Cael, Michel Louette, Aline Herman, Olivier Deparis, Michael Sarrazin
MATERIALS TODAY-PROCEEDINGS
(2017)
Proceedings Paper
Engineering, Electrical & Electronic
M. Lobet, M. Sarrazin
2016 10TH INTERNATIONAL CONGRESS ON ADVANCED ELECTROMAGNETIC MATERIALS IN MICROWAVES AND OPTICS (METAMATERIALS)
(2016)
Proceedings Paper
Engineering, Electrical & Electronic
Louis Dellieu, Olivier Deparis, Branko Kolaric, Michael Sarrazin
2015 IEEE NANOTECHNOLOGY MATERIALS AND DEVICES CONFERENCE (NMDC)
(2015)
