Surface state reconstruction in ion-damaged SmB_6

(2) Dept. of Physics; Astronomy; F. Ronning (1); Irvine); J. D. Thompson (1) ((1) Los Alamos National Laboratory; N. Wakeham (1); University of California; Y. Q. Wang (1); Z. Fisk (2)

arxiv: 1502.04103 · v1 · pith:YG7RFSADnew · submitted 2015-02-13 · ❄️ cond-mat.str-el · cond-mat.mtrl-sci

Surface state reconstruction in ion-damaged SmB₆

N. Wakeham (1) , Y. Q. Wang (1) , Z. Fisk (2) , F. Ronning (1) , J. D. Thompson (1) ((1) Los Alamos National Laboratory , (2) Dept. of Physics , Astronomy , University of California

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classification ❄️ cond-mat.str-el cond-mat.mtrl-sci

keywords damagestatesurfaceconsistentdepthion-irradiationresistivitybehavior

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We have used ion-irradiation to damage the (001) surfaces of SmB_6 single crystals to varying depths, and have measured the resistivity as a function of temperature for each depth of damage. We observe a reduction in the residual resistivity with increasing depth of damage. Our data are consistent with a model in which the surface state is not destroyed by the ion-irradiation, but instead the damaged layer is poorly conducting and the initial surface state is reconstructed below the damage. This behavior is consistent with a surface state that is topologically protected.

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Surface state reconstruction in ion-damaged SmB₆

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