Journal ArticleDOI
Theory of polarization of crystalline solids
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TLDR
It is shown that physically $\ensuremath{\Delta}P can be interpreted as a displacement of the center of charge of the Wannier functions.Abstract:
We consider the change in polarization \ensuremath{\Delta}P which occurs upon making an adiabatic change in the Kohn-Sham Hamiltonian of the solid. A simple expression for \ensuremath{\Delta}P is derived in terms of the valence-band wave functions of the initial and final Hamiltonians. We show that physically \ensuremath{\Delta}P can be interpreted as a displacement of the center of charge of the Wannier functions. The formulation is successfully applied to compute the piezoelectric tensor of GaAs in a first-principles pseudopotential calculation.read more
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Van der Waals Multiferroic Tunnel Junctions.
TL;DR: This work explores spin-dependent transport properties of van der Waals MFTJs which consist of two-dimensional ferromagnetic FenGeTe2 electrodes and 2D ferroelectric In2Se3 barrier layers and finds a remarkably low RA product (less than 1 Ω·μm2) which makes the proposed vdW MFTJs superior to the conventional MFTJs in terms of their promise for nonvolatile memory applications.
Journal ArticleDOI
Design of Two-Dimensional Multiferroics with Direct Polarization-Magnetization Coupling.
Junting Zhang,Xiaofan Shen,Yan-Cheng Wang,Chao Ji,Ying Zhou,Jianli Wang,Fengzhen Huang,Xiaomei Lu +7 more
TL;DR: This work demonstrates the magnetization reversal through switching polarization in a designed 2D multiferroic oxide by combining group theory analysis and first-principles calculation and shows that ferroelectricity can be induced by a specific octahedral rotation in a perovskite bilayer.
Journal ArticleDOI
Quantum Spin Pump in S=1/2 Antiferromagnetic Chains –Holonomy of Phase Operators in sine-Gordon Theory–
TL;DR: In this paper, the authors proposed the quantum spin pumping in quantum spin systems where an applied electric field (E ) and magnetic field (H ) cause a finite spin gap to its critical ground state.
Journal ArticleDOI
Ultra-wideband and wide-angle polarization rotator based on double W-shaped metasurface
TL;DR: In this paper, a novel polarization converter based on a metasurface with double w-shaped unit cells is proposed, which can convert linearly polarized incident waves into its cross polarized reflective counterparts in a very wide band with high efficiency.
Journal ArticleDOI
Observation of topological transport quantization by dissipation in fast Thouless pumps
TL;DR: In this article, the authors introduce non-Hermitian Floquet engineering as a new concept to overcome the problem of quantized particle transport in slowly varying potentials (Thouless pumping) and predict that a topological band structure and associated quantized transport can be restored at driving frequencies as large as the system's band gap.
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