2024 Flat chern band

Flat chern band

Author: kglq

August undefined, 2024

WebAug 1, 2024 · @Tengen In general, the flat band is not associated with non-trivial Chern number. For example, the Kagome flat band has no Chern number, and in fact the Chern number is not even well-defined due to the gapless character at the band touching point. For the gapped flat bands, many of them do have non-trivial Chern numbers, but I do … WebAug 22, 2024 · In the presence of short-range repulsion, we find fractional Chern insulators emerge at filling factors $\nu=1/m$, whose ground states are generalized Laughlin wavefunctions. We further argue that generalized Wigner crystals may emerge at certain commensurate fillings under a highly nonuniform magnetic field in the form of a flux line …

[1912.11469] Chern bands of twisted bilayer graphene: fractional …

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 … WebFigure: (a) The Haldane honeycomb (HH) model [25], an example of an FCI. (b) The band structure of the HH model, with parameters chosen to generate an extremely flat lowest band. Band Geometry Fractional Chern Insulators and the W∞ algebra. The basic theoretical puzzle posed by FCIs is to provide a microscopic description of their physics. driveway geotextile fabric

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WebMar 8, 2013 · Flat Chern band in a two-dimensional organometallic framework Phys Rev Lett. 2013 Mar 8;110 (10):106804. doi: 10.1103/PhysRevLett.110.106804. Epub 2013 … Web2 days ago · An unusual topological quantum phase transition induced by the on-site Coulomb interaction brings a nearly flat band with a nonzero Chern number as the highest occupied band. With this analysis we ... WebNov 1, 2013 · Abstract. We present a pedagogical review of the physics of fractional Chern insulators with a particular focus on the connection to the fractional quantum Hall effect. While the latter conventionally arises in semiconductor heterostructures at low temperatures and in high magnetic fields, interacting Chern insulators at fractional band filling ... driveway gate with wheels

Flat Chern Band From Twisted Bilayer MnBi$_2$Te$_4$

WebFeb 12, 2024 · We introduce a scheme by which flat bands with higher Chern number can be designed in ultracold gases through a coherent manipulation of Bloch bands. Inspired by quantum-optics methods, our approach consists in creating a "dark Bloch band" by coupling a set of source bands through resonant processes. WebWe devise local lattice models whose ground states are model fractional Chern insulators—Abelian and non-Abelian topologically ordered states characterized by exact ground state degeneracies at any finite size and infi… epoxy thawingWebJan 4, 2024 · Systems with a flat Chern band have been extensively studied for their potential to realize high-temperature fractional quantum Hall states. To experimentally observe the quantum transport properties, a sizable topological gap is highly necessary. Taking advantage of the high tunability of two-dimensional ... driveway gloss sealer

"WebApr 12, 2024 · The relation between chiral edge modes and bulk Chern numbers of quantum Hall insulators is a paradigmatic example of bulk-boundary correspondence. … " - Flat chern band

Flat chern band

WebNov 2, 2024 · We consequently explore the effect of large exchange coupling on the electronic bandstructure when the magnetic layer hosts chiral spin textures such as skyrmions. A flat Chern band is found at a... WebDec 24, 2024 · Chern bands of twisted bilayer graphene: fractional Chern insulators and spin phase transition. When one of the graphene layers of Magic Angle Twisted Bilayer …

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WebWe focus on two regimes: (i) topological flat bands with non-zero Chern numbers, C, including bands with higher Chern numbers C g r e a t e r t h a n 1; and (ii) an unprecedented phase consisting of a stack of nearly perfect flat bands with C = 0. For realistic values of the potential and superlattice periodicity, this stack can span nearly ... WebMar 27, 2024 · We find the system exhibits highly tunable Chern bands with Chern number up to 3. We show that a twist angle of 1° turns the highest valence band into a flat band …

Web2 layer, whereas the bottom band contains exclusively states in the WSe 2 layer. b. By tuning the perpendicular electric eld V through a critical value, a band inversion oc-curs around the 0 point. The colorscale indicates whether states live in the MoTe 2 layer (red) or WSe 2 layer (blue). The resulting bands carry a nonzero Chern number with ... WebMar 18, 2024 · @article{osti_1811500, title = {Orbital Chern Insulator and Quantum Phase Diagram of a Kagome Electron System with Half-Filled Flat Bands}, author = {Ren, Yafei and Jiang, Hong-Chen and Qiao, Zhenhua and Sheng, D. N.}, abstractNote = {In this work, we study the quantum phase diagram of electrons on kagome lattice with half-filled …

WebMay 17, 2024 · Systems with a flat Chern band have been extensively studied for their potential to realize high-temperature fractional quantum Hall states. To experimentally observe the quantum transport properties, a sizable topological gap is highly necessary. Taking advantage of the high tunability of two-dimensional ... WebMar 26, 2024 · Abstract. We construct a continuum model for the moiré superlattice of twisted bilayer MnBi2Te4, and study the band structure of the bilayer in both …

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 twisted bilayer MnBi Te, and study the band structure of the bilayer in both ferromagnetic (FM) and antiferromagnetic (AFM) phases.

WebFeb 22, 2024 · We point out the possibility of a nearly flat band with Chern number C=2 on the dice lattice in a simple nearest-neighbor tightbinding model. This lattice can be naturally formed by three adjacent (111) layers of cubic lattice, which may be realized in certain thin films or artificial heterostructures, such as the SrTiO3/SrIrO3/SrTiO3 trilayer … epoxy thread sealantWebFeb 24, 2024 · A flat Chern band is found at a “magic” value of magnetization m ≏ 0:2 for Schrödinger electrons, and it generally occurs for Dirac electrons. The magnetic … epoxy timberWebMay 10, 2012 · Flat-band localization, as an important phenomenon in solid-state physics, is fundamentally interesting in the exploration of exotic ground-state properties of many … epoxy swirl flooringWebWe find the system exhibits highly tunable Chern bands with Chern number up to 3. We show that a twist angle of 1° turns the highest valence band into a flat band with Chern … driveway glitterWebJan 18, 2024 · The px,y orbitals of Tl on the honeycomb lattice form ideal pxy four-bands, through which a flat Chern band with a spin-orbit coupling (SOC) gap around 140 meV evolves below the Fermi level. This is the … driveway google reviewsWebBaba Commandant & The Mandingo Band Hosted By Speakeasy Promotions. Event starts on Saturday, 20 May 2024 and happening at 529 Flat Shoals Ave SE Atlanta GA 30316, … driveway golfWebJun 2, 2024 · Flatness of higher Chern bands and topological obstructions. (a) Band flatness bound of vs. electronic hopping range Λ for Chern bands with C = 2, 4, 8. Solid … driveway gif