Electronic structure of Fe and Co magnetic adatoms on Bi2Te3 surfaces

被引：35

作者：

Shelford, L. R.

Hesjedal, T. ^{[1
]}

Collins-McIntyre, L. ^{[1
]}

Dhesi, S. S.

Maccherozzi, F.

van der Laan, G.

机构：

[1] Univ Oxford, Clarendon Lab, Oxford OX1 3PU, England

来源：

PHYSICAL REVIEW B | 2012年 / 86卷 / 08期

关键词：

RAY CIRCULAR-DICHROISM; SUM-RULES; TRANSITION; INSULATOR; STATES;

D O I：

10.1103/PhysRevB.86.081304

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Magnetic doping of topological insulators (TIs) is a prerequisite for their application as spin-based devices. Using x-ray magnetic circular dichroism (XMCD) we investigate the influence of an ultralow coverage (similar to 0.5% of a monolayer) of magnetic atoms on a TI substrate. For Fe and Co adatoms on Bi2Te3 at similar to 1.5 K we find an orbital-to-spin magnetic moment ratio of similar to 0.45. The magnetization curve of the Fe atoms recorded by XMCD is in quantitative agreement with a paramagnetic behavior with no indication of long-range magnetic order. The spectral shape of the XMCD indicates that the adatoms are weakly hybridized with the substrate and form narrowband states. The results show that the adatoms are not capable of breaking time-reversal symmetry.

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页数：5

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共 38 条

[1] Ordering of Magnetic Impurities and Tunable Electronic Properties of Topological Insulators [J].

Abanin, D. A. ;

Pesin, D. A. .

PHYSICAL REVIEW LETTERS, 2011, 106 (13)

[2]

[Anonymous], REV MOD PHYS

[3] Quantum spin Hall effect and topological phase transition in HgTe quantum wells [J].

Bernevig, B. Andrei ;

Hughes, Taylor L. ;

Zhang, Shou-Cheng .

SCIENCE, 2006, 314 (5806) :1757-1761

[4] Direct observation of orbital magnetism in cubic solids -: art. no. 077205 [J].

Brewer, WD ;

Scherz, A ;

Sorg, C ;

Wende, H ;

Baberschke, K ;

Bencok, P ;

Frota-Pessôa, S .

PHYSICAL REVIEW LETTERS, 2004, 93 (07) :077205-1

[5] Orbital magnetism of transition-metal adatoms and clusters on the Ag and Au(001) surfaces [J].

Cabria, I ;

Nonas, B ;

Zeller, R ;

Dederichs, PH .

PHYSICAL REVIEW B, 2002, 65 (05) :1-9

[6] X-RAY CIRCULAR-DICHROISM AND LOCAL MAGNETIC-FIELDS [J].

CARRA, P ;

THOLE, BT ;

ALTARELLI, M ;

WANG, XD .

PHYSICAL REVIEW LETTERS, 1993, 70 (05) :694-697

[7] EXPERIMENTAL CONFIRMATION OF THE X-RAY MAGNETIC CIRCULAR-DICHROISM SUM-RULES FOR IRON AND COBALT [J].

CHEN, CT ;

IDZERDA, YU ;

LIN, HJ ;

SMITH, NV ;

MEIGS, G ;

CHABAN, E ;

HO, GH ;

PELLEGRIN, E ;

SETTE, F .

PHYSICAL REVIEW LETTERS, 1995, 75 (01) :152-155

[8] Massive Dirac Fermion on the Surface of a Magnetically Doped Topological Insulator [J].

Chen, Y. L. ;

Chu, J. -H. ;

Analytis, J. G. ;

Liu, Z. K. ;

Igarashi, K. ;

Kuo, H. -H. ;

Qi, X. L. ;

Mo, S. K. ;

Moore, R. G. ;

Lu, D. H. ;

Hashimoto, M. ;

Sasagawa, T. ;

Zhang, S. C. ;

Fisher, I. R. ;

Hussain, Z. ;

Shen, Z. X. .

SCIENCE, 2010, 329 (5992) :659-662

[9] Topological insulators with inversion symmetry [J].

Fu, Liang ;

Kane, C. L. .

PHYSICAL REVIEW B, 2007, 76 (04)

[10] Localized magnetic states of Fe, Co, and Ni impurities on alkali metal films [J].

Gambardella, P ;

Dhesi, SS ;

Gardonio, S ;

Grazioli, C ;

Ohresser, P ;

Carbone, C .

PHYSICAL REVIEW LETTERS, 2002, 88 (04) :4-472024

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