Article
Chemistry, Multidisciplinary
Hanna Ulmefors, Josefin Nissa, Hudson Pace, Olov Wahlsten, Anders Gunnarsson, Daniel T. Simon, Magnus Berggren, Fredrik Hook
Summary: The study explores the formation of supported lipid bilayers (SLBs) on PEDOT:PSS/silica nanoparticle composite films and mesoporous silica films. Mesoporous silica thin film outperforms PEDOT:PSS/silica nanoparticle composite, successfully forming bilayers with high lateral mobility and low defect density even for the most complex native cell membranes.
Article
Nanoscience & Nanotechnology
Guilherme B. Berselli, Aurelien Gimenez, Alexandra O'Connor, Tia E. Keyes
Summary: A biomolecular photoactive device based on light-activated proton pump bR reconstituted into highly fluidic microcavity-supported lipid bilayers (MSLBs) has been developed, demonstrating efficient photoelectrical properties. The optimal conditions for a self-sustaining photoelectrical switch were determined, showing significant increase in transient current for lipid bilayers containing approximately 0.3 mol % bR with a measured photo-current of 250 nA/cm(2).
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Physical
Afshan Ardalan, Shahin Sowlati-Hashjin, Stephanie O. Uwumarenogie, Michael Fish, Joel Mitchell, Mikko Karttunen, Matthew D. Smith, Masoud Jelokhani-Niaraki
Summary: This study analyzed the tertiary and quaternary structures of UCP2, revealing its tetrameric functional form in lipid membranes and its asymmetry-inducing properties. Additionally, the asymmetric water density within the UCP2 monomer and its potential mode of transport were highlighted. The structurally similar AAC1, on the other hand, did not form tetramers, showing that tetramerization is not a universal feature among mitochondrial carriers.
JOURNAL OF PHYSICAL CHEMISTRY B
(2021)
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
Biochemical Research Methods
Siddhartha Banerjee, Yuri L. Lyubchenko
Summary: The article discusses the preparation of smooth, stable, and structurally homogeneous lipid bilayers without trapped vesicles, for probing the time-dependent early stages of aggregation of monomeric amyloid proteins. This methodology development allows for monitoring amyloid protein aggregation at low protein concentrations, and for studying the specific role of different lipids in aggregation kinetics and disease development mechanisms.
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
Biochemistry & Molecular Biology
Toshinori Motegi, Kingo Takiguchi, Yohko Tanaka-Takiguchi, Toshiki Itoh, Ryugo Tero
Summary: This study explored the size, distribution, and fluidity of microdomains in a lipid bilayer containing phosphatidylinositol (PI), showing that PI-derived submicron domains hindered lipid diffusion. Furthermore, the PI-derived microdomain acted as a scaffold for protein adsorption during the two-dimensional assembly of a membrane deformation protein.
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
Petar Tomic, Peter Rickhaus, Aitor Garcia-Ruiz, Giulia Zheng, Elias Portoles, Vladimir Fal'ko, Kenji Watanabe, Takashi Taniguchi, Klaus Ensslin, Thomas Ihn, Folkert K. de Vries
Summary: In this study, magnetotransport oscillations caused by scattering between minivalleys in twisted double bilayer graphene are investigated. An electron-phonon mechanism and valley conserving scattering are found to be likely mechanisms.
PHYSICAL REVIEW LETTERS
(2022)
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
Physics, Multidisciplinary
Carmen Rubio-Verdu, Simon Turkel, Yuan Song, Lennart Klebl, Rhine Samajdar, Mathias S. Scheurer, Jorn W. F. Venderbos, Kenji Watanabe, Takashi Taniguchi, Hector Ochoa, Lede Xian, Dante M. Kennes, Rafael M. Fernandes, Angel Rubio, Abhay N. Pasupathy
Summary: A study on twisted double bilayer graphene reveals the presence of three-fold rotational symmetry breaking, indicative of an interaction-driven electronic nematic phase that emerges from the normal metal state and is related to the scale of the moire lattice.
Article
Chemistry, Physical
Ruiheng Su, Manabendra Kuiri, Kenji Watanabe, Takashi Taniguchi, Joshua Folk
Summary: Identifying the essential components of superconductivity in graphene-based systems remains a critical problem in two-dimensional materials research. This field is connected to the mysteries that underpin investigations of unconventional superconductivity in condensed-matter physics. Here we report the discovery of superconductivity in twisted double bilayer graphene (TDBG) in proximity to WSe2, showing the correlation between a high density of states and the emergence of superconductivity in TDBG while revealing a possible role for isospin fluctuations in the pairing.
Article
Nanoscience & Nanotechnology
Zachary A. Manzer, Surajit Ghosh, Miranda L. Jacobs, Srinivasan Krishnan, Warren R. Zipfel, Miguel Pineros, Neha P. Kamat, Susan Daniel
Summary: This study introduces a new approach to integrate membrane proteins into hybrid-supported lipid bilayers using a cell-free expression system, allowing for the interface between cellular mimetic structures and analytical tools. Different methods are demonstrated to successfully integrate proteins into hybrid-supported lipid bilayers, leading to oriented protein assembly, with diblock copolymers facilitating protein mobility within the bilayers.
ACS APPLIED BIO MATERIALS
(2021)
Review
Cell Biology
Takaharu Sakuragi, Shigekazu Nagata
Summary: Cellular membranes are made up of lipid bilayers containing glycerophospholipids, sphingolipids, and cholesterol. These membranes serve as barriers and compartments for cells, with proteins embedded within them. Phospholipids are distributed asymmetrically in the membrane and can change location, playing roles in signaling and biological processes. The movement of phospholipids between the bilayers is mediated by proteins called flippases and scramblases. Defects in these proteins can lead to human diseases. This review examines the structure and physiological roles of flippases and scramblases, as well as the mechanisms and consequences of their dysfunction.
NATURE REVIEWS MOLECULAR CELL BIOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Minhao He, Jiaqi Cai, Ya-Hui Zhang, Yang Liu, Yuhao Li, Takashi Taniguchi, Kenji Watanabe, David H. Cobden, Matthew Yankowitz, Xiaodong Xu
Summary: Twisted double bilayer graphene has been studied as a platform for studying strongly correlated and topological states. In this research, a phase diagram representing these states as a function of parameters was constructed based on measurements of several devices. Symmetry-broken states were observed at a specific twist angle, including a Chern insulator state with band filling of 7/2 and an incipient state with filling of 11/3. An anomalous Hall effect was also observed at zero magnetic field in samples supporting the symmetry-broken states.