2024 Flat chern band

Flat chern band

Author: gfjv

August undefined, 2024

WebFeb 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 … WebMar 8, 2013 · Here, we present a first-principles design of a two-dimensional indium-phenylene organometallic framework that realizes a nearly flat Chern band right around the Fermi level by combining lattice...

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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 … WebNov 20, 2015 · The Chern numbers Cn for individual bands calculated from the Bloch functions may be nonzero (such as the flat band n =2 in the figure), but their sum equals zero . The Chern number refers... god\\u0027s-penny fi

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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 ... WebJan 3, 2024 · Here, we report the experimental observation of ferromagnetism at noninteger filling (NIF) of a flat Chern band in a ABC-TLG/hBN moiré superlattice. This state exhibits prominent ferromagnetic hysteresis behavior with large anomalous Hall resistivity in a broad region of densities centered in the valence miniband at n = −2.3 n0. god\u0027s-penny fc

Tunable Orbital Ferromagnetism at Noninteger Filling of a Moiré ...

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WebFeb 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 … 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 ... god\u0027s-penny ffWebWe 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… god\u0027s-penny fr

"WebJan 18, 2024 · ABSTRACT Systems with a flat Chern band have been extensively studied for their potential to realize high-temperature fractional quantum Hall states. To … " - Flat chern band

Flat chern band

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 … WebJan 18, 2024 · Abstract 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.

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WebAug 5, 2024 · In two-dimensional flat-band systems with Cn symmetry, when the degeneracy of a SR-enforced band crossing is lifted by a Cn symmetry-preserving perturbation, we obtain a nearly flat Chern band. WebThe Zeeman-type moiré potentials generically gap out the moiré surface Dirac cones and give rise to isolated flat Chern minibands with Chern number ±1 . Interestingly, the bandwidth of such isolated flat minibands is insensitive to the twisting angle, which originates from the completely flat band of the p orbitals on the honeycomb lattice.

WebMar 8, 2013 · Here, we present a first-principles design of a two-dimensional indium-phenylene organometallic framework that realizes a nearly flat Chern band right around the Fermi level by combining lattice geometry, spin-orbit coupling, and ferromagnetism. An effective four-band model is constructed to reproduce the first-principles results. 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 ...

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 ... WebNov 18, 2024 · This band carries a spin/valley Chern number and is well described by a generalized Kane−Mele model 33. At half filling of this topological flat band, we show that repulsive interactions...

WebSystems 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...

WebJan 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 ... god\u0027s-penny flWebMar 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 … god\\u0027s-penny feWebApr 12, 2024 · The relation between chiral edge modes and bulk Chern numbers of quantum Hall insulators is a paradigmatic example of bulk-boundary correspondence. … god\u0027s-penny ftWebJan 15, 2024 · The valley Chern numbers of the two nearly flat bands in the twisted TLG depends on the twist angle θ and the perpendicular electric field E ⊥. Considering its topological flat bands, the twisted TLG should be an ideal experimental platform to study the strongly correlated physics in topologically nontrivial flat band systems. god\u0027s-penny fdWebFigure: (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. god\u0027s-penny foWebMay 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 … god\\u0027s-penny fyWebFeb 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. god\\u0027s-penny fr