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南京大学最新Nature

  • 2026-05-10 21:24:47
南京大学最新Nature
iNature

反常霍尔效应(AHE)发生在时间反演对称性破缺的材料中,体现了磁有序与电子轨道运动之间的相互作用。在二维(2D)系统中,AHE与面内手性轨道运动相关的面外轨道磁化相耦合。在三维(3D)系统中,样品厚度远超过垂直相干输运长度,此时AHE实际上是其二维对应物在厚度上的平均,仍由面内轨道运动产生的面外轨道磁化主导。

2026年4月29日,南京大学王雷、于葛亮、上海科技大学刘健鹏、南方科技大学赵悦共同通讯Nature线发表Transdimensional anomalous Hall effect in rhombohedral thin graphite的研究论文。该研究报道了一种全新的反常霍尔效应。该效应无法用传统二维或三维框架解释,它同时涉及面内和面外的轨道磁化。研究团队将其命名为跨维度反常霍尔效应。

电子在磁场下通过材料时,由于洛伦兹力的作用会沿弯曲轨迹运动,从而产生一个垂直于电流和磁场方向的霍尔电压。尽管普通霍尔效应需要外加磁场,但反常霍尔效应(AHE)即使在没有外加磁场的情况下也会出现,通常出现在时间反演对称性破缺的铁磁系统中。AHE可源于外在机制,如斜散射和侧跳;也可源于内在机制,即由动量空间中的贝里曲率驱动,这从根本上与导电电子的拓扑性质相关。在传统的磁性系统中,磁化通常同时来源于自旋自由度和轨道磁化。后者通过自旋-轨道耦合(SOC)来源于自旋与电子轨道运动的相互作用,这对于内在AHE是不可或缺的。这一情形适用于铁磁金属、铁磁半导体以及磁性拓扑材料。

与这种SOC驱动的场景不同,扭转的范德瓦尔斯体系最近展示了一种不同的AHE成因:它可能出现在库仑相互作用驱动的轨道铁磁态中,在缺乏SOC的情况下自发地破缺时间反演对称性。在这些SOC可忽略的体系中,已经观察到了整数量子反常霍尔效应(QAHE)和分数量子反常霍尔效应。然而,无论轨道磁化源于SOC还是库仑相互作用,目前所有观察到的AHE和QAHE都遵循一个正交规则:轨道磁化M、电流以及与霍尔电压相关的横向电场的方向必须相互垂直。 MJ×EH。

AHE的维度透视和菱形九层石墨烯的基本表征(图源自Nature

该研究报道了一种实验观测到的全新类型AHE,它在多层菱形石墨烯中同时耦合了面内和面外轨道磁化,表现为在面内和面外磁场下均出现显著的霍尔电阻回滞。这种状态源于一个奇特的金属相,该相由电子-电子相互作用驱动,自发地破缺了时间反演对称性、镜面对称性和旋转对称性。通过对3至15层的多个器件进行测量,该现象仅在2-5纳米的中间厚度范围内出现。
理论计算表明,在此厚度窗口内,载流子能够在二维平面内和跨平面方向上维持相干的轨道运动。这些共同确定了一个介于2D和3D之间、此前未被探索的“跨维度”区域,在此区域中,样品厚度远大于原子间距但仍与相当,从而促成了这种新物态—跨维度反常霍尔效应(TDAHE)的出现。该发现指向了一类独特的AHE,为在跨维度体系中探索关联与拓扑物理开辟了新的模型。
参考消息:

https://www.nature.com/articles/s41586-026-10471-1

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  1. CONNECT:[ UseTime:0.000480s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000843s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000343s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.006419s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000662s ]
  6. SELECT * FROM `set` [ RunTime:0.002741s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000637s ]
  8. SELECT * FROM `article` WHERE `id` = 549713 LIMIT 1 [ RunTime:0.004089s ]
  9. UPDATE `article` SET `lasttime` = 1778616589 WHERE `id` = 549713 [ RunTime:0.015289s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.002329s ]
  11. SELECT * FROM `article` WHERE `id` < 549713 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000680s ]
  12. SELECT * FROM `article` WHERE `id` > 549713 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.006483s ]
  13. SELECT * FROM `article` WHERE `id` < 549713 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.007124s ]
  14. SELECT * FROM `article` WHERE `id` < 549713 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.028502s ]
  15. SELECT * FROM `article` WHERE `id` < 549713 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.013157s ]
0.162101s