Surface magnetic ordering in topological insulators with bulk magnetic dopants

G. Rosenberg; M. Franz

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Surface magnetic ordering in topological insulators with bulk magnetic dopants

机译：具有体磁掺杂剂的拓扑绝缘体的表面磁排序

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We show that a three-dimensional topological insulator doped with magnetic impurities in the bulk can have a regime where the surface is magnetically ordered but the bulk is not. This is in contrast to conventional materials where bulk ordered phases are typically more robust than surface ordered phases. The difference originates from the topologically protected gapless surface states characteristic of topological insulators. We study the problem using a mean-field approach in two concrete models that give the same qualitative result, with some interesting differences. Our findings could help explain recent experimental results showing the emergence of a spectral gap in the surface state of Bi_2Se_3 doped with Mn or Fe atoms, but with no measurable bulk magnetism.

机译：我们表明，在本体中掺杂了磁性杂质的三维拓扑绝缘体可以具有一种表面磁化但本体没有磁化的状态。这与常规材料相反，在常规材料中，本体有序相通常比表面有序相更坚固。差异源自拓扑绝缘子的受拓扑保护的无间隙表面状态。我们使用均值场方法在两个给出相同定性结果但有一些有趣差异的具体模型中研究该问题。我们的发现可以帮助解释最近的实验结果，该结果表明在掺杂了Mn或Fe原子的Bi_2Se_3的表面状态中出现了谱隙，但没有可测量的体磁。

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来源
《Physical review》 |2012年第19期|p.195119.1-195119.7|共7页
作者
G. Rosenberg; M. Franz;
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作者单位

Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia, Canada, V6T IZ1;

Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia, Canada, V6T IZ1 Kavli Institute for Theoretical Physics, University of California, Santa Barbara, California 93106-4030, USA;

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正文语种 eng
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insulators; intrinsic properties of magnetically ordered materials; electron states at surfaces and interfaces; phases: geometric; dynamic or topological;

机译：绝缘子;磁性有序材料的固有特性;表面和界面的电子态;阶段：几何;动态或拓扑;

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1. Impact of magnetic dopants on magnetic and topological phases in magnetic topological insulators [J] . Thanh-Mai Thi Tran, Duc-Anh Le, Tuan-Minh Pham, Physical review.B.Condensed matter and materials physics . 2020,第20期

机译：磁掺杂剂对磁拓扑绝缘子磁性和拓扑相的影响
2. Identification of magnetic dopants on the surfaces of topological insulators: Experiment and theory for Fe on Bi_2Te_3(lll) [J] . D. West, Y. Y. Sun, S. B. Zhang, Physical review . 2012,第8期

机译：拓扑绝缘体表面磁性掺杂剂的识别：Bi_2Te_3（lll）上Fe的实验和理论
3. Evidence of surface and bulk magnetic ordering in Fe and Mn doped Bi_2(SeS)_3 topological insulator [J] . Mahima Singh, Shiv Kumar, Mohd Alam, Applied Physics Letters . 2021,第13期

机译：Fe和Mn掺杂Bi_2（SES）_3拓扑绝缘体中表面和散装磁性排序的证据
4. Theoretical studies of single magnetic impurities on the surface of semiconductors and topological insulators [C] . M. R. Mahani, A. Pertsova, C. M. Canali, Materials Research Society Symposium on Single-Dopant Semiconductor Optoelectronics . 2013

机译：半导体表面与拓扑绝缘子表面上单磁杂质的理论研究
5. Magnetic Memory with Topological Insulators and Ferrimagnetic Insulators [D] . Shao, Qiming. 2019

机译：磁性记忆与拓扑绝缘体和亚铁磁性绝缘体
6. Imaging Dirac-mass disorder from magnetic dopant atoms in the ferromagnetic topological insulator Crx(Bi0.1Sb0.9)2-xTe3 [O] . Inhee Lee, Chung Koo Kim, Jinho Lee, 2015

机译：从铁磁拓扑绝缘体Crx（Bi0.1Sb0.9）2-xTe3中的磁性掺杂原子成像狄拉克质量失调
7. Surface magnetic ordering in topological insulators with bulk magnetic dopants [O] . Rosenberg, G., Franz, M. 2012

机译：具有体磁性的拓扑绝缘体中的表面磁性排序掺杂剂

Surface magnetic ordering in topological insulators with bulk magnetic dopants

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