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arXiv 2603.04652cond-mat.mes-hallquant-ph
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从边界诱导的边缘态量子化统一整数和分数量子霍尔效应

Unified Integer and Fractional Quantum Hall Effects from Boundary-Induced Edge-State Quantization

Departamento de Ciencias Básicas, UAM-Azcapotzalco(阿兹卡波察尔科自治大学基础科学系)

Pedro Pereyra

AI总结:

研究通过边界诱导的边缘态量子化解释整数和分数量子霍尔效应的统一机制,揭示了Landau能级量子化与边界诱导的引导中心离散化之间的相互作用。

摘要:

尽管Landau能级理论和边缘态输运形式在成功,但尚未建立bulk量子化与观察到的量子霍尔阶跃层次之间的直接微观联系。特别是,没有统一的微观机制同时解释整数和分数序列。本文展示边界诱导的边缘态量子化提供了这个缺失的桥梁。从横向限制的二维电子系统中的Landau问题出发,证明施加Dirichlet、Neumann和混合(Robin)边界条件会离散化引导中心坐标和长程动量。由此产生的边界依赖的能谱生成具有明确多重性的边缘通道,这些通道耦合到电子输运。当纳入边缘态输运描述时,这种边界量子化重现了整数霍尔序列,并同时产生结构化的分数填充因子层次,而无需引入单独的微观机制。进一步显示弱霍尔诱导的奇偶性破坏贡献重新组织低能边缘能谱,同时保持bulk Landau能级不变。这种受控的对称性破坏增强了小Landau指数处的边缘态多重性,并稳定了强磁场下观察到的分数阶跃。量子霍尔响应因此源于Landau量子化与边界诱导的引导中心离散化之间的相互作用,共同决定了边缘通道的谱和占据。这些结果确立了边界诱导的量子化作为量子霍尔输运的微观起源,并在常规量子力学中提供了整数和分数区域的统一描述。

英文摘要:

Despite the success of Landau-level theory and edge-state transport formalisms, a direct microscopic link between bulk quantization and the observed hierarchy of quantum Hall plateaus has not been established. In particular, no unified microscopic mechanism accounting simultaneously for integer and fractional sequences has been derived within standard quantum mechanics. Here we show that boundary-induced quantization of edge states provides this missing bridge. Starting from the Landau problem in laterally confined two-dimensional electron systems, we demonstrate that the imposition of Dirichlet, Neumann, and mixed (Robin) boundary conditions discretizes both the guiding-center coordinate and the longitudinal momentum of chiral edge states. The resulting boundary-dependent spectra generate families of edge channels with well-defined multiplicities that couple to electronic transport. When incorporated into an edge-state transport description, this boundary quantization reproduces the integer Hall sequence and simultaneously yields a structured hierarchy of fractional filling factors without invoking separate microscopic mechanisms. We further show that a weak Hall-induced parity-breaking contribution reorganizes the low-energy edge spectrum while leaving the bulk Landau levels intact. This controlled symmetry breaking enhances edge-state multiplicities at small Landau indices and stabilizes the fractional plateaus observed at strong magnetic fields. The quantized Hall response thus emerges from the interplay between Landau quantization and boundary-induced guiding-center discretization, which together determine the spectrum and occupation of chiral edge channels. These results establish boundary-induced quantization as the microscopic origin of quantum Hall transport and provide a unified description of both integer and fractional regimes within conventional quantum mechanics.

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