AI Article Synopsis
- The study focuses on the electronic transport properties of dual-gated twisted-bilayer graphene, highlighting unique behaviors due to the close proximity of layers.
- Researchers find that each graphene layer contributes independently to magnetoresistance, and they can control the filling factors of these layers separately through dual gates.
- An insulating state is observed at zero filling factor, explained by the interaction of counterpropagating edge states, especially under large displacement fields.
Article Abstract
We investigate electronic transport in dual-gated twisted-bilayer graphene. Despite the subnanometer proximity between the layers, we identify independent contributions to the magnetoresistance from the graphene Landau level spectrum of each layer. We demonstrate that the filling factor of each layer can be independently controlled via the dual gates, which we use to induce Landau level crossings between the layers. By analyzing the gate dependence of the Landau level crossings, we characterize the finite interlayer screening and extract the capacitance between the atomically spaced layers. At zero filling factor, we observe an insulating state at large displacement fields, which can be explained by the presence of counterpropagating edge states with interlayer coupling.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1103/PhysRevLett.108.076601 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Time-Reversal Symmetry Breaking Superconductivity in HfRhGe: A Noncentrosymmetric Weyl Semimetal.
Adv Mater
December 2024
Department of Physics, Indian Institute of Science Education and Research Bhopal, Bhopal, Madhya Pradesh, 462066, India.
Weyl semimetals are a novel class of topological materials with unique electronic structures and distinct properties. HfRhGe stands out as a noncentrosymmetric Weyl semimetal with unconventional superconducting characteristics. Using muon-spin rotation and relaxation (µSR) spectroscopy and thermodynamic measurements, a fully gapped superconducting state is identified in HfRhGe that breaks time-reversal symmetry at the superconducting transition.
View Article and Find Full Text PDFChiral Light-Matter Interactions with Thermal Magnetoplasmons in Graphene Nanodisks.
Nano Lett
December 2024
Instituto de Química Física Blas Cabrera (IQF), CSIC, 28006 Madrid, Spain.
We investigate the emergence of self-hybridized thermal magnetoplasmons in doped graphene nanodisks at finite temperatures upon being subjected to an external magnetic field. Using a semianalytical approach, which fully describes the eigenmodes and polarizability of the graphene nanodisks, we show that the hybridization originates from the coupling of transitions between thermally populated Landau levels and localized magnetoplasmon resonances of the nanodisks. Owing to their origin, these modes combine the extraordinary magneto-optical response of graphene with the strong field enhancement of plasmons, making them an ideal tool for achieving strong chiral light-matter interactions, with the additional advantage of being tunable through carrier concentration, magnetic field, and temperature.
View Article and Find Full Text PDFLandau Rainbow Induced by Artificial Gauge Fields.
Phys Rev Lett
December 2024
New Cornerstone Science Laboratory, Department of Physics, University of Hong Kong, Hong Kong, China.
The ability to generate Landau levels using a pseudomagnetic field (PMF), also called an artificial gauge field, opens up new pathways for exploring fundamental physics and developing novel applications based on topological protection. In this Letter, we simultaneously realize a PMF and a pseudoelectric field (PEF) on a photonic crystal platform and observe a rainbow effect of the Landau zeroth modes. While a PMF induces a series of discretized Landau levels of photons in a similar way as the quantum Hall effect for electrons, a PEF breaks the degeneracy of the flat band of Landau levels over a broad range.
View Article and Find Full Text PDFTunable Topological Transitions Probed by the Quantum Hall Effect in Twisted Double Bilayer Graphene.
Nano Lett
December 2024
State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai 200433, China.
The moiré system provides a tunable platform for investigating exotic quantum phases. Particularly, the displacement field is crucial for tuning the electronic structures and topological properties of twisted double bilayer graphene (TDBG). Here, we present a series of -tunable topological transitions by the evolution of quantum Hall phases (QHPs) in the valence bands of TDBG.
View Article and Find Full Text PDFGraph convolution networks model identifies and quantifies gene and cancer specific transcriptome signatures of cancer driver events.
Comput Biol Med
December 2024
Gaffin Center for Neuro-Oncology, Sharett Institute for Oncology, Hadassah Medical Center and Faculty of Medicine, Hebrew University of Jerusalem, Israel; The Wohl Institute for Translational Medicine, Hadassah Medical Center and Faculty of Medicine, Hebrew University of Jerusalem, Israel. Electronic address:
Background: The identification and drug targeting of cancer causing (driver) genetic alterations has seen immense improvement in recent years, with many new targeted therapies developed. However, identifying, prioritizing, and treating genetic alterations is insufficient for most cancer patients. Current clinical practices rely mainly on DNA level mutational analyses, which in many cases fail to identify treatable driver events.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!