arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2512.06342cond-mat.mes-hallcond-mat.mtrl-sci
收藏

量子自旋霍尔效应与Su-Schrieffer-Heeger模型在新型C3N基哑铃形结构中的实现

Quantum Spin Hall Effect and Su-Schrieffer-Heeger Model Implementation in Novel C3N-based Dumbbell Morphologies

University of Calcutta(加尔各答大学);Indian Institute of Science(印度科学学院);Acharya Prafulla Chandra College(阿查里亚·普拉富拉·钱德拉学院)

Deep Mondal, Arka Bandyopadhyay, Atanu Nandy, Debnarayan Jana

AI总结:

本研究通过第一性原理方法揭示了新型C3N基哑铃形结构中量子自旋霍尔效应和Su-Schrieffer-Heeger模型的拓扑特性。

摘要:

二维碳氮材料因其在能量收集、环境修复和纳米电子应用中的多样化用途而成为研究焦点。广泛的应用前景和良好的合成可能性使这一家族成为研究的热点,但其背后的分析方面仍不突出。最近,利用第一性原理的方法,我们报告了一种六种不同结构的C3NX家族,具有独特的哑铃形形态,用于功能化最近合成的C3N单层。在这里,我们深入探讨了半金属哑铃形C3NX片和纳米带的非平凡拓扑相。自旋轨道耦合诱导费米能级上的间隙,随后通过外部电场调节,通过 Berry 曲率分布展示能带反转,利用 Wannier 电荷中心(WCC)评估拓扑指数,从而确立了拓扑足迹的痕迹。实空间降维方案和格林函数技术评估了底层的能谱信息及其相应的传输特性。利用 Su-Schrieffer-Heeger(SSH)模型观察到这些准一维系统的迷人特征,其中不同的扭折相揭示了不同的拓扑特征,即使在低原子质量系统如 DB C4N 中也是如此。

英文摘要:

Two-dimensional carbon nitride materials have been the center of attention for their diverse usage in energy harvesting, environmental remediation and nanoelectronic applications. A broad range of utilities with decent synthetic plausibility have made this family a sweet spot to dive into, whereas the underlying analytical aspects are yet to have prominence. Recently, using the machinaries of first principles, we reported a family of six different structures C3NX with a unique dumbbell-shaped morphology, functionalizing the recently synthesized monolayer of C3N. Here we have critically explored the non-trivial topological phases of the semimetallic Dumbbell C3NX sheets and nanoribbons. Spin-orbit coupling induced gap across the Fermi level, its subsequent tuning via an external electric field, portrayal of band inversion from the Berry curvature distribution and the evaluation of topological index using the Wannier charge center (WCC) firmly establishes the traces of topological footprint. The real space decimation scheme and Green function technique evaluate the underlying spectral information with corresponding transport characteristics. Fascinating features of these quasi-1D systems are observed utilizing the Su-Schrieffer-Heeger (SSH) model where different twisted phases reveal distinct topological signatures even in a low atomic mass system like DB C4N.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑