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Oct 26, 2024 | 
nature.com | Michele Masseroni |Archisman Panigrahi |Felix R. Fischer |Chuyao Tong |Jonas Gerber |Takashi Taniguchi | +4 more
AbstractVan der Waals heterostructures provide a versatile platform for tailoring electronic properties through the integration of two-dimensional materials. Among these combinations, the interaction between bilayer graphene and transition metal dichalcogenides (TMDs) stands out due to its potential for inducing spin–orbit coupling (SOC) in graphene.
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Sep 13, 2024 | 
link.aps.org | Zhiyu Dong |Leonid S. Levitov
Stoner magnetism in bands endowed with Berry curvature is shown to be influenced by the coupling between spin-chirality density s·(∂xs×∂ys) and Berry's orbital magnetization. The key effect is that carriers moving in the presence of a spin texture see it as a source of a geometric magnetic field coupled to the carrier's orbital motion through a spin-dependent Aharonov-Bohm effect. This interaction was recently predicted to enable chiral magnons propagating along system boundaries.
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Aug 28, 2024 | 
nature.com | Tian Yu Xie |Yunbo Ou |Kenji Watanabe |Takashi Taniguchi |Leonid S. Levitov
AbstractNumerous correlated many-body phases, both conventional and exotic, have been reported in magic-angle twisted bilayer graphene (MATBG)1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24. However, the dynamics associated with these correlated states, crucial for understanding the underlying physics, remain unexplored.
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Jul 26, 2024 | 
link.aps.org | Khachatur G. Nazaryan |Leonid S. Levitov
Vortices in electron fluids are a key indicator of electron hydrodynamics. However, a comprehensive framework linking macroscopic vorticity measurements with microscopic interactions and scattering mechanisms has been lacking. We employ wave-number-dependent conductivity σ(k), which incorporates rates of realistic microscopic scattering processes and is built as a continued fraction from decay rates for different excitations.
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Jul 8, 2024 | 
link.aps.org | Archisman Panigrahi |Leonid S. Levitov
Recently, a wide family of electronic orders was unveiled in graphene flat bands, such as spin- and valley-polarized phases as well as nematic momentum-polarized phases, stabilized by exchange interactions via a generalized Stoner mechanism. Momentum polarization involves orbital degrees of freedom and is therefore expected to impact resistivity in a way that is uniquely sensitive to the ordering type.
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Apr 24, 2024 | 
link.aps.org | Sophie Fisher |Olumakinde Ogunnaike |Leonid S. Levitov
Motivated by recent cold atom experiments exploring the phase structure of Bose-Fermi mixtures, we propose novel emergent bound states. Cold atoms embedded in a degenerate Fermi system interact via a fermionic analog of the Casimir force, which is an attraction of a −1/r form at distances shorter than the Fermi wavelength.
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Apr 11, 2024 | 
nature.com | Anna M. Seiler |Martin Statz |Kenji Watanabe |Takashi Taniguchi |Leonid S. Levitov
AbstractBernal bilayer graphene (BLG) offers a highly flexible platform for tuning the band structure, featuring two distinct regimes. One is a tunable band gap induced by large displacement fields. Another is a gapless metallic band occurring at low fields, featuring rich fine structure consisting of four linearly dispersing Dirac cones and van Hove singularities.
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Feb 16, 2024 | 
link.aps.org | Margarita Davydova |Patrick Ledwith |Leonid S. Levitov |Qiantan Hong
Electron hydrodynamics gives rise to surprising correlated behaviors in which electrons cooperate to quench dissipation and reduce the electric fields needed to sustain the flow. Such collective free flows are usually expected at the hydrodynamic length scales exceeding the electron-electron scattering mean free path ℓee. Here we predict that in two-dimensional electron gases, the collective free flows actually occur at distances much smaller than ℓee, in a nominally ballistic regime.
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Oct 13, 2023 | 
link.aps.org | Zhiyu Dong |Leonid S. Levitov |Andrey Chubukov
Spin excitations that soften near the onset of magnetic order have long been known to act as “paramagnon” pairing glue that can drive superconductivity. Recent findings of superconductivity in graphene bilayers and trilayers, occurring in the proximity of different itinerant ordered phases polarized in isospin (spin and valley), have motivated us to conduct a comprehensive study of an isospin extension of the paramagnon pairing mechanism in the vicinity of different isospin orders.
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Aug 1, 2023 | 
link.aps.org | Alexander L. Efros |Bertrand Halperin |Leonid S. Levitov |Mark Dykman
Abstract DOI:https://doi.org/10.1103/PhysRevB.108.070001©2023 American Physical SocietyCollections This article appears in the following collection:Emmanuel Rashba: Breaking New Ground in Solid-State ExplorationPhysical Review B is pleased to present the “Collection in Honor of Emmanuel I.
