Flat chern band from twisted bilayer mnbi2te4

Author: dvqy

August undefined, 2024

WebMay 17, 2024 · The primitive cell of MnBi 2 Te 4 is hexagonal (figure 1 (a)), with a lattice constant of a0 = 4.38 Å and a magnetic moment of m = 5.0 μB. The Mn atomic layer is sandwiched between two Te–Bi–Te slabs. The magnetic coupling between Mn 2+ is transmitted by indirect exchange of Te. WebPDF We construct a continuum model for the moir\'e superlattice of twisted bilayer ${\mathrm{MnBi}}_{2}{\mathrm{Te}}_{4}$, and study the band structure of the bilayer in …

Γ valley transition metal dichalcogenide moiré bands - Semantic …

Webf> 0.93, and the first valence band carries Chern numberV1¼ −1. Therefore, the FM tBMBT enters the QAH phase at a smaller FM strength γ fthan the untwisted FM bilayer MnBi2Te4, which suggests that twisting helps achieve the QAH effect in bilayer MnBi2Te4. WebMoiré systems host flat Chern bands. However, time-reversal symmetry dictates the Chern numbers from two valleys, namely, K and K′, to be opposite, making the total Chern number C K + CK ... effect measurements in twisted double bilayer graphene (TDBG), that the BCD detects Z 2 transition and changes its sign. Probing topological transitions ... lajos i jokasta

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WebSep 30, 2024 · The discovery of flat bands in magic-angle twisted bilayer graphene (MATBG)1–3 with non-trivial topology4–7 has provided a compelling platform in which to … Weblink.aps.org WebMar 7, 2024 · We theoretically study the band structures and the valley Chern numbers of the AB—AB and AB—BA stacked twisted double bilayer graphene under heterostrain effect. In the absence of heterostrain, due to the constrains by the spatial symmetries, the central two flat bands of the AB—AB are topological trivial bands, while in the AB—BA … lajosi sensor wb

Flat chern band from twisted bilayer mnbi2te4

WebEnter the email address you signed up with and we'll email you a reset link. WebHere, we report the observation of a QAH effect showing robust zero magnetic field quantization in a flat-band (θ ≈ 1.15 ± 0.01°) tBLG sample aligned to hBN. The electronic structure of flat-band tBLG is described by two distinct bands per spin and valley projection isolated from higher-energy dispersive bands by an energy gap.

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WebMar 3, 2024 · It is theoretically shown that isolated flat moiré bands described by generalized triangular lattice Hubbard models are present in twisted transition metal dichalcogenide heterobilayers. 279 PDF View 5 excerpts, references background Correlated electronic phases in twisted bilayer transition metal dichalcogenides Lei Wang, En-Min … WebMar 27, 2024 · We construct a continuum model for the moiré superlattice of twisted bilayer MnBi_{2}Te_{4}, and study the band structure of the bilayer in both …

WebNov 23, 2024 · Using both analytical and numerical calculations, we demonstrate that nearly flat bands can be engineered at small twist angles near the magic angles of the static system. The flatness and the gaps between these bands can be tuned optically by varying laser frequency and amplitude. WebAug 7, 2024 · We construct a continuum model for the Moir\'e superlattice of twisted bilayer MnBi$_2$Te$_4$, and study the band structure of the bilayer in both ferromagnetic …

WebIn this work, we probe the quantum transport in atomically thin flakes of intrinsic magnetic TI MnBi 2 Te 4.MnBi 2 Te 4 is a layered ternary tetradymite compound that consists of Te … WebWe construct a continuum model for the moiré superlattice of twisted bilayer MnBi 2 Te 4, and study the band structure of the bilayer in both ferromagnetic (FM) and …

WebAug 7, 2024 · Flat Chern Band From Twisted Bilayer MnBi. Te. Biao Lian, Zhaochen Liu, Yuanbo Zhang, Jing Wang. We construct a continuum model for the Moiré superlattice of …

WebAbstract We construct a continuum model for the moiré superlattice of twisted bilayer MnBi2Te4, and study the band structure of the bilayer in both ferromagnetic (FM) and … lajos kalmarWebNov 18, 2024 · In magic-angle twisted bilayer graphene 5 (TBG), experiments have discovered a variety of correlated electron states 6,7,8,9,10,11,12 facilitated by flat moiré … lajosi puttersWebat topological bands. A prime ex-ample is twisted bilayer graphene (tBLG) [32{35], where the lowest two bands carry a fragile topology [36{40] and become at near the magic twist angle ˇ1: 1 . In addition, at valley Chern bands can be realized in tBLG with aligned hBN substrate [41{43], twisted double bilayer graphene [44{46], ABC trilayer graphene lajosi putter reviewhttp://harvest.aps.org/v2/journals/articles/10.1103/PhysRevLett.124.126402/fulltext lajosi gun metalWebMay 27, 2024 · When one of the graphene layers of magic-angle twisted bilayer graphene is nearly aligned with its hexagonal boron nitride substrate (a configuration dubbed TBG/hBN), the active electronic bands are nearly flat and have a Chern number C=±1. lajoskaWebJul 30, 2024 · The antiferromagnetic topological insulator MnBi2Te4 exhibits Chern and axion insulator phases at low magnetic field; however, its behaviour in high magnetic field has remained unexplored. lajos kassak auktionAbstract We construct a continuum model for the moiré superlattice of twisted bilayer MnBi2Te4, and study the band structure of the bilayer in both ferromagnetic (FM) and antiferromagnetic (AFM) phases. We find the system exhibits highly tunable Chern bands with Chern number up to 3. lajos kassak