石墨烯狭缝结中的可调电子量子光学
Tunable Electron Quantum Optics in Graphene Slit Junctions
- Mohammed VI Polytechnic University（穆罕默德六世理工大学）
- AGH University of Krakow（克拉科夫AGH科技大学）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
研究石墨烯狭缝结作为紧凑几何结构，通过三角翘曲和边界反射实现定向电子束、相干干涉及对称控制旋滤波，并展示双层石墨烯的低能类似现象。
AI中文摘要：
研究了石墨烯狭缝结作为一种紧凑几何结构，用于定向电子束形成、相干干涉和对称控制的旋滤波。结合非平衡格林函数形式的原子级紧束缚计算表明，单层石墨烯中的三角翘曲在E~2.7eV附近产生强定向电子束。边界反射将这些电子束重新导向公共漏极，其中透射表现出与h/e阿哈罗诺夫-玻姆周期一致的磁通依赖振荡，其调制通过傅里叶分析和谐波拟合表征。局部静电门提供对干涉相位的额外控制。在独立的自洽平均场哈伯德计算中，原始反铁磁基态显示自旋简并透射，而结构或静电破坏左右对称性则能够实现旋滤波。使用四带连续模型的互补谷分辨计算证明了双层石墨烯在E=50meV处的类似束形成。结果表明狭缝结是电子光学和自旋相关输运的通用几何结构，并促进对低能双层实现方案的进一步研究。
英文摘要：
A graphene slit junction is investigated as a compact geometry for directional electron-beam formation, coherent interference, and symmetry-controlled spin filtering. Atomistic tight-binding calculations combined with the nonequilibrium Green's function formalism show that trigonal warping in monolayer graphene produces strongly directional electron beams near E~2.7eV. Boundary reflections redirect these beams toward a common drain, where the transmission exhibits magnetic flux-dependent oscillations consistent with an h/e Aharonov-Bohm period, whose modulation is characterized by Fourier analysis and harmonic fitting. A local electrostatic gate provides additional control of the interference phase. In separate self-consistent mean-field Hubbard calculations, the pristine antiferromagnetic ground state is shown to have spin-degenerate transmission, whereas structural or electrostatic breaking of the left-right symmetry enables spin filtering. Complementary valley-resolved calculations using a four-band continuum model demonstrate analogous beam formation in bilayer graphene at E = 50meV. The results identify the slit junction as a common geometry for electron-optical and spin-dependent transport and motivate further investigation of low-energy bilayer implementations.
