关联辅助的自旋选择性金属性：应变与双层交替磁体
Correlation-assisted spin-selective metallicity in strained and bilayer altermagnets
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中文总结 AI 辅助
本研究通过Hubbard模型与RISB方法，揭示了关联、应变、掺杂和堆叠可协同调控交替磁体，实现完全自旋极化的费米面，为无铁磁自旋电子学提供新途径。
中文摘要 AI 辅助
交替磁体将消失的净磁化强度与动量相关的自旋劈裂电子结构相结合，为无需铁磁性即可获得自旋极化载流子提供了一条途径。在此，我们研究了电子关联、掺杂、单轴应变和层间耦合如何在单层和双层系统的最小Hubbard型模型中控制交替磁性。通过将Hartree-Fock理论与旋转不变奴隶玻色子（RISB）方法进行比较，我们证明了交替磁序对准粒子重整化的鲁棒性，并揭示了在更强耦合下磁序起始与准粒子相干性丧失之间的分离。在单层中，掺杂产生显著的粒子-空穴不对称性，而将其与单轴应变结合，可在接近半填充时产生完全自旋极化的费米面。在双层中，有利于层交替磁序参数铁性排列的堆叠方式，使其动量相关的自旋劈裂能够建设性地组合。弱的非对称掺杂还会诱导晶胞内电荷序，从而产生完全自旋极化的低能载流子。在双层填充为四个轨道中五个电子时，我们发现了从顺磁体到交替磁体的连续转变，随后在更强耦合下，演变为具有强烈抑制准粒子权重的类Mott regime。我们的结果确立了关联、应变、掺杂和堆叠作为控制交替磁金属和产生完全自旋极化费米面的互补手段。
英文摘要
Altermagnets combine vanishing net magnetization with a momentum-dependent spin-split electronic structure, providing a route to spin-polarized carriers without ferromagnetism. Here, we investigate how electronic correlations, doping, uniaxial strain, and interlayer coupling control altermagnetism within a minimal Hubbard-type model for mono- and bilayer systems. Comparing Hartree--Fock theory with the rotationally invariant slave-boson (RISB) approach, we demonstrate the robustness of altermagnetic order against quasiparticle renormalization and reveal a separation between the onset of magnetic order and the loss of quasiparticle coherence at stronger coupling. In the monolayer, doping produces a pronounced particle--hole asymmetry, while its combination with uniaxial strain generates a fully spin-polarized Fermi surface close to half-filling. In the bilayer, stacking that favors ferroic alignment of the layer altermagnetic order parameters allows their momentum-dependent spin splittings to combine constructively. Weak asymmetric doping additionally induces intra-unit-cell charge order, resulting in fully spin-polarized low-energy carriers. At a bilayer filling of five electrons in four orbitals, we find a continuous paramagnet-to-altermagnet transition followed, at stronger coupling, by an evolution toward a Mott-like regime with strongly suppressed quasiparticle weight. Our results establish correlations, strain, doping, and stacking as complementary means of controlling altermagnetic metals and generating fully spin-polarized Fermi surfaces.
发表机构
- Ruhr-Universität Bochum（波鸿鲁尔大学）
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