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36 results for “twisted bilayer graphene”
Infrared Spectroscopy for Diagnosing Superlattice Minibands in Magic-angle Twisted Bilayer Graphene
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Experimental data for "Electric field drives Chern transition in Hofstadter bands of twisted double bilayer graphene"
<p>This experimental dataset was used in our study of "Electric field drives Chern transition in Hofstadter bands of twisted double bilayer graphene".</p>
Figure data for Dynamical Correlations and Order in Magic-Angle Twisted Bilayer Graphene
<p>This repository contains the data corresponding to all figures in the main text of the 2024 (to appear) Phys. Rev. X article <em>Dynamical Correlations and Order in Magic-Angle Twisted Bilayer Graphene</em>. See README for notes on how to access. </p> <p>The simulation code used to generate this data is available on github.<br>w2dynamics simulations: <a href="https://github.com/lcrippa/w2dynamics-matbg-symmetric">https://github.com/lcrippa/w2dynamics-matbg-symmetric</a><br>TRIQS simulations: <a href="https://github.com/gautamra/TBLG_ordered">https://github.com/gautamra/TBLG_ordered</a></p>
Transport effects of twist-angle disorder in mesoscopic twisted bilayer graphene
<p>Magic-angle twisted bilayer graphene is a tunable material with remarkably flat energy bands near the Fermi level, leading to fascinating transport properties and correlated states at low temperatures. However, grown pristine samples of this material tend to break up into landscapes of twist-angle domains, strongly influencing the physical properties of each individual sample. This poses a significant problem to the interpretation and comparison between measurements obtained from different samples. In this work, we study numerically the effects of twist-angle disorder on quantum electron transport in mesoscopic samples of magic-angle twisted bilayer graphene. We find a significant property of twist-angle disorder that distinguishes it from onsite-energy disorder: it leads to an asymmetric broadening of the energy-resolved conductance. The magnitude of the twist-angle variation has a strong effect on conductance, while the number of twist-angle domains is of much lesser significance. We further establish a relationship between the asymmetric broadening and the asymmetric density of states of twisted bilayer graphene at angles smaller than the first magic angle. Our results show that the qualitative differences between the types of disorder in the energy-resolved conductance of twisted bilayer graphene samples can be used to characterize them at temperatures above the critical temperatures of the correlated phases, enabling systematic experimental studies of the effects of the different types of disorders also on the other properties such as the competition of the different types of correlated states appearing at lower temperatures.</p> <p>The provided repository contains all data and scripts to reproduce the figures of the manuscript. </p>
Transport signatures of Van Hove singularities in mesoscopic twisted bilayer graphene
<p>Magic-angle twisted bilayer graphene exhibits quasi-flat low-energy bands with Van Hove singularities close to the Fermi level. These singularities play an important role in the exotic phenomena observed in this material, such as superconductivity and magnetism, by amplifying electronic correlation effects. In this work, we study the correspondence of four-terminal conductance and the Fermi surface topology as a function of the twist angle, pressure, and energy in mesoscopic, ballistic samples of small-angle twisted bilayer graphene. We establish a correspondence between features in the wide-junction conductance and the presence of van Hove singularities in the density of states. Moreover, we identify additional transport features, such as a large, pressure-tunable minimal conductance, conductance peaks coinciding with non-singular band crossings, and unusually large conductance oscillations as a function of the system size. Our results suggest that twisted bilayer graphene close the magic angle is a unique system featuring simultaneously large conductance due to the quasi-flat bands, strong quantum non-linearity due to the Van Hove singularities and high sensitivity to external parameters, which could be utilized in high-frequency device applications and sensitive detectors.</p> <p>The provided repository contains all data and scripts to reproduce the figures of the manuscript. In the new version of the repository we also provide scripts to create finite samples for conductance calculations and to create periodic samples for band structure calculations.</p>
Implementing electronic signatures of graphene and hexagonal boron nitride in twisted bilayer molybdenum disulfide
<p><strong>Abstract</strong></p> <p>Angeli and MacDonald reported a superlattice-imposed Dirac band in twisted bilayer molybdenum disulphide (tBL MoS2) for small twist angles towards the R_h^M (parallel) stacking. Using a hierarchical set of theoretical methods, we show that the superlattices differ for twist angles with respect to metastable R_h^M (0°) and lowest-energy H_h^h (60°) configurations. When approaching R_h^M stacking, identical domains with opposite spatial orientation emerge. They form a honeycomb superlattice, yielding Dirac bands and a lateral spin texture distribution with opposite-spin-occupied K and K’ valleys. Small twist angles towards the H_h^h configuration (60°) generate H_h^h and H_h^X stacking domains of different relative energies and, hence, different spatial extensions. This imposes a symmetry break in the moiré cell, which opens a gap between the two top-valence bands, which become flat already for relatively small moiré cells. The superlattices impose electronic superstructures resembling graphene and hexagonal boron nitride into trivial semiconductor MoS<sub>2</sub>.</p> <p>The data set published in this repository was used to create the preprint published at <strong>https://doi.org/10.26434/chemrxiv-2023-rx2fz</strong>.</p> <p><strong>Content of repository</strong></p> <ul> <li>"ReaxFF_structure_optimization.zip": contains the inputs and outputs for all structure optimizations for ML, BL, and tBL systems using the Reax force field, performed using LAMMPS.</li> <li>" bilayer_verification_ReaxFF_with_DFT.zip": contains the inputs and outputs for verifying the results of the Reax force field by running DFT geometry optimization and total energy calculations in FHI-aims for the high-symmetry bilayer stackings.</li> <li>"QATK_band_structures_and_eff_mass.zip": contains the inputs and outputs of all calculations done via QuantumATK (QATK), including calculations for ML, BL, and tBL systems on DFT and DFTB level of theory.</li> <li>"TB_fit.zip": contains the Python scripts and input data (DFTB band structure) used to fit the TB Hamiltonians as described in the Methods section and shown in the Supplementary Material.</li> <li>"effective_masses_from_bands.zip": contains the extraction of the effective hole masses from the bands calculated at the DFTB level of theory in QATK.</li> </ul>
Experimental data for "Localization of lattice dynamics in low-angle twisted bilayer graphene"
<p>This repository contains the experimental data related to the article "Localization of lattice dynamics in low-angle twisted bilayer graphene" and is provided to the reader under the “data availability” directive. the files have been organized on a per-figure basis.</p>
Strain fields in twisted bilayer graphene: Dataset 10 of 19
<p>See supplemental materials of Kazmierczak & Van Winkle et al for more information.</p> <p>20200616_13.h5 : dataset s2-13 corresponding to mean angle of 0.16</p>
Strain fields in twisted bilayer graphene: Dataset 11 of 19
<p>See supplemental materials of Kazmierczak & Van Winkle et al for more information.</p> <p>20200616_3.h5 : dataset s2-3 corresponding to mean angle of 1.1669</p>
Strain fields in twisted bilayer graphene: Dataset 6 of 19
<p>See supplemental materials of Kazmierczak & Van Winkle et al for more information.</p> <p>20200616_2.h5 : dataset s2-2 corresponding to mean angle of 0.317</p>
Strain fields in twisted bilayer graphene: Dataset 4 of 19
<p>See supplemental materials of Kazmierczak & Van Winkle et al for more information.</p> <p>02262020_15.h5 : dataset s1-15 corresponding to mean angle of 0.1203</p> <p>20200616_8.h5 : dataset s2-8 corresponding to mean angle of 0.663</p> <p>20200616_9.h5 : dataset s2-9 corresponding to mean angle of 0.6632</p>
Strain fields in twisted bilayer graphene: Dataset 12 of 19
<p>See supplemental materials of Kazmierczak & Van Winkle et al for more information.</p> <p>20200616_4.h5 : dataset s2-4 corresponding to mean angle of 1.1897</p>
Strain fields in twisted bilayer graphene: Dataset 16 of 19
<p>See supplemental materials of Kazmierczak & Van Winkle et al for more information.</p> <p>20200616_19.h5 : dataset s2-19 corresponding to mean angle of 0.16</p> <p>20200616_20.h5 : dataset s2-20 corresponding to mean angle of 0.16</p> <p>20200616_21.h5 : dataset s2-21 corresponding to mean angle of 0.16</p>
Strain fields in twisted bilayer graphene: Dataset 17 of 19
<p>See supplemental materials of Kazmierczak & Van Winkle et al for more information.</p> <p>20200616_1.h5 : dataset s2-1 corresponding to mean angle of 0.2894</p> <p>20200616_23.h5 : dataset s2-23 corresponding to mean angle of 1.3067</p>
Strain fields in twisted bilayer graphene: Dataset 8 of 19
<p>See supplemental materials of Kazmierczak & Van Winkle et al for more information.</p> <p>20200616_8.h5 : dataset s2-8 corresponding to mean angle of 0.7534</p>
Strain fields in twisted bilayer graphene: Dataset 3 of 19
<p>See supplemental materials of Kazmierczak & Van Winkle et al for more information.</p> <p>02262020_18.h5 : dataset s2-10 corresponding to mean angle of 0.1355</p>
Strain fields in twisted bilayer graphene: Dataset 7 of 19
<p>See supplemental materials of Kazmierczak & Van Winkle et al for more information.</p> <p>20200616_24.h5 : dataset s2-24 corresponding to mean angle of 1.3178</p> <p>20200616_25.h5 : dataset s2-25 corresponding to mean angle of 1.3468</p> <p>20200616_26.h5 : dataset s2-26 corresponding to mean angle of 1.3259</p>
Strain fields in twisted bilayer graphene: Dataset 2 of 19
<p>See supplemental materials of Kazmierczak & Van Winkle et al for more information.</p> <p>02262020_10.h5 : dataset s1-10 corresponding to mean angle of 0.6272</p> <p>02262020_5.h5 : dataset s1-5 corresponding to mean angle of 1.2343</p> <p>02262020_8.h5 : dataset s1-8 corresponding to mean angle of 1.3672</p>
Strain fields in twisted bilayer graphene: Dataset 15 of 19
<p>See supplemental materials of Kazmierczak & Van Winkle et al for more information.</p> <p>20200616_14.h5 : dataset s2-14 corresponding to mean angle of 0.16</p>
Strain fields in twisted bilayer graphene: Dataset 1 of 19
<p>See supplemental materials of Kazmierczak & Van Winkle et al for more information.</p> <p>02262020_1.h5 : dataset s1-1 corresponding to mean angle of 0.3619, cropped region {[10,100],[100,190]} corresponding to mean angle of 0.3991</p> <p>02262020_2.h5 : dataset s1-2 corresponding to mean angle of 1.0325</p> <p>02262020_4.h5 : dataset s1-4 corresponding to mean angle of 1.2276</p> <p> </p> <p> </p>
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