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Articles by Alex Levchenko
Extrinsic anomalous Hall effect in altermagnets
Abstract We find the extrinsic anomalous Hall conductivity (AHC) to be comparable to the intrinsic one in roughly half of the altermagnetic spin Laue groups in the limit of large exchange splitting. In materials with a finite Dzyaloshinskii-Moriya type interaction, the extrinsic contribution is essential even in the clean limit. In other altermagnets it is mostly negligible. This peculiar behavior is linked to the nonanalytic dependence of the intrinsic AHC on spin-orbit coupling.
Intrinsic anomalous Hall effect in altermagnets
We study the anomalous Hall effect arising from the altermagnetic order and spin-orbit interaction in doped FeSb2. To investigate the anomalous transport, we have constructed a tight-binding model of FeSb2. We separately considered the constraints imposed on the model parameters by the spin symmetry group and magnetic symmetry group at zero and finite spin-orbit interaction, respectively.
Spin mechanism of drag resistance in strongly correlated electron liquids
We investigate the effect of Coulomb drag resistance in a bilayer system of strongly correlated electron liquids magnetized by an in-plane field employing the framework of hydrodynamic theory. We identify a mechanism for drag magnetoresistance, which physically arises from the spin diffusion driven by fluctuations of the spin currents within a partially spin-polarized fluid.
Near-field heat transfer and drag resistance in bilayers of composite fermions
Heat transfer is studied in the system of electron double layers of correlated composite fermion quantum liquids. In the near-field regime, the primary mechanism governing interlayer energy transfer is mediated by the Coulomb interaction of thermally-driven charge density fluctuations. The corresponding interlayer thermal conductance is computed across various limiting cases of the composite fermion Chern-Simons gauge theory, encompassing ballistic, diffusive, and hydrodynamic regimes.
Majorana bound state parity exchanges in planar Josephson junctions
We describe a scheme to exchange fermion parity between two pairs of Majorana bound states mediated by coupling with a centralized quantum dot. We formulate such a scheme for Majorana bound states nucleated in the Josephson vortices formed in a fourfold crossroads junction of planar topological superconductors in the presence of a perpendicular magnetic field.
Giant magnetoresistance in weakly disordered non-Galilean invariant conductors
Abstract We develop a hydrodynamic description of electron magnetotransport in conductors without Galilean invariance in the presence of a weak long-range disorder potential. We show that magnetoresistance becomes strong (of order 100%) at relatively small fields, at which the inverse square of the magnetic length becomes comparable to disorder-induced variations of the electron density.
Optical conductivity of a metal near an Ising-nematic quantum critical point
We study the optical conductivity of a pristine two-dimensional electron system near an Ising-nematic quantum critical point. We discuss the relation between the frequency scaling of the conductivity and the shape of the Fermi surface, namely, whether it is isotropic, convex, or concave. We confirm the cancellation of the leading order terms in the optical conductivity for the cases of isotropic and convex Fermi surfaces and show that the remaining contribution scales as |ω|2/3 at T=0.
Transport anomalies in multiband superconductors near the quantum critical point
We study the effects of quantum fluctuations on the transport properties of multiband superconductors near a pair-breaking quantum critical point. For this purpose, we consider a minimal model of the quantum phase transition in a system with two nested two-dimensional Fermi surfaces. Under the assumption that doping the system adds nonmagnetic impurities but does not change the densities of carriers, we include disorder potentials that render both intra- and interband collisions.
Coulomb Drag and Heat Transfer in Strange Metals
We address Coulomb drag and near-field heat transfer in a double-layer system of incoherent metals. Each layer is modeled by an array of tunnel-coupled SYK dots with random interlayer interactions. Depending on the strength of intradot interactions and interdot tunneling, this model captures the crossover from the Fermi liquid to a strange metal phase.
Thermal transfer enhancement by hydrodynamic plasmons in electron bilayers
We develop a theory of heat transfer induced by thermal charge fluctuations in two-dimensional electron double layers. We consider pristine systems comprised of identical layers and focus on the regime of sufficiently high temperatures and interlayer distances d, where the relevant charge fluctuations may be described using the hydrodynamic approach. In this limit heat transfer is dominated by the plasmon resonances.
Drag resistance mediated by quantum spin liquids
Abstract Recent advances in material synthesis made it possible to realize two-dimensional monolayers of candidate materials for a quantum spin liquid (QSL) such as α−RuCl3, 1T-TaSe2, and 1T-TaS2. In this work, we propose an experimental setup that exploits nonlocal electrical probes to gain information on the transport properties of a gapless QSL.
Anomalous High-Temperature Magnetoresistance in a Dilute 2D Hole System
Abstract We report an unusual magnetoresistance that strengthens with the temperature in a dilute two-dimensional (2D) hole system in GaAs/AlGaAs quantum wells with densities p=1.98−0.99×1010/cm2 where rs, the ratio between Coulomb energy and Fermi energy, is as large as 20–30.
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