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Akademický článek

Samarium hexaboride is a trivial surface conductor

Autor: P. Hlawenka, K. Siemensmeyer, E. Weschke, A. Varykhalov, J. Sánchez-Barriga, N. Y. Shitsevalova, A. V. Dukhnenko, V. B. Filipov, S. Gabáni, K. Flachbart, O. Rader, E. D. L. Rienks

Publikováno v: Nature Communications, Vol 9, Iss 1, Pp 1-7 (2018)

Samarium hexahoride is argued to be a topological Kondo insulator, but this claim remains under debate. Here, Hlawenka et al. provide a topologically trivial explanation for the conducting states at the (100) surface of samarium hexaboride; an explan

Externí odkaz: https://doaj.org/article/f28f822dd1b94bb882e54e1328f0a9f8

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A consistent view of the samarium hexaboride terminations to resolve the nature of its surface states

Autor: Herrmann, H., Hlawenka, P., Siemensmeyer, K., Weschke, E., Sánchez-Barriga, J., Varykhalov, A., Shitsevalova, N. Y., Dukhnenko, A. V., Filipov, V. B., Gabáni, S., Flachbart, K., Rader, O., Sterrer, M., Rienks, E. D. L.

The research effort prompted by the prediction that SmB$_6$ could be the first topological Kondo insulator has produced a wealth of new results, though not all of these seem compatible. A major discrepancy exists between scanning tunneling microscopy

Externí odkaz: http://arxiv.org/abs/1810.13380

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Tailoring the nature and strength of electron-phonon interactions in the SrTiO$_3$(001) two-dimensional electron liquid

Publikováno v: Nature Materials (2016)

Surfaces and interfaces offer new possibilities for tailoring the many-body interactions that dominate the electrical and thermal properties of transition metal oxides. Here, we use the prototypical two-dimensional electron liquid (2DEL) at the SrTiO

Externí odkaz: http://arxiv.org/abs/1506.01191

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Angle-resolved and core-level photoemission study of interfacing the topological insulator Bi1.5Sb0.5Te1.7Se1.3 with Ag, Nb and Fe

Autor: de Jong, N., Frantzeskakis, E., Zwartsenberg, B., Huang, Y. K., Wu, D., Hlawenka, P., Sánchez-Barriga, J., Varykhalov, A., van Heumen, E., Golden, M. S.

Publikováno v: Phys. Rev. B 92, 075127 (2015)

Interfaces between a bulk-insulating topological insulator (TI) and metallic adatoms have been studied using high-resolution, angle-resolved and core-level photoemission. Fe, Nb and Ag were evaporated onto Bi1.5Sb0.5Te1.7Se1.3 (BSTS) surfaces both at

Externí odkaz: http://arxiv.org/abs/1504.07486

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Samarium hexaboride: A trivial surface conductor

Autor: Hlawenka, P., Siemensmeyer, K., Weschke, E., Varykhalov, A., Sánchez-Barriga, J., Shitsevalova, N. Y., Dukhnenko, A. V., Filipov, V. B., Gabáni, S., Flachbart, K., Rader, O., Rienks, E. D. L.

Publikováno v: Nat. Commun. 9 (2018) 517

Recent theoretical and experimental studies suggest that SmB$_6$ is the first topological Kondo insulator: A material in which the interaction between localized and itinerant electrons renders the bulk insulating at low temperature, while topological

Externí odkaz: http://arxiv.org/abs/1502.01542

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Electronic structure and quantum criticality in Ba(Fe$_{1-x-y}$Co$_{x}$Mn$_{y}$)$_{2}$As$_{2}$, an ARPES study

Autor: Rienks, E. D. L., Wolf, T., Koepernik, K., Avigo, I., Hlawenka, P., Lupulescu, C., Arion, T., Roth, F., Eberhardt, W., Bovensiepen, U., Fink, J.

Publikováno v: EPL 103, 47004 (2013)

We used angle-resolved photoemission spectroscopy (ARPES) and density functional theory calculations to study the electronic structure of Ba(Fe1-x-yCoxMny)2As2 for x=0.06 and 0<=y <=0.07. From ARPES we derive that the substitution of Fe by Mn does no

Externí odkaz: http://arxiv.org/abs/1301.4365

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Massless Dirac fermions in epitaxial graphene on Fe(110)

Autor: Varykhalov, A., Sánchez-Barriga, J., Hlawenka, P., Rader, O.

Graphene grown on Fe(110)by chemical vapor deposition using propylene is investigated by means of angle-resolved photoemission. The presence of massless Dirac fermions is clearly evidenced by the observation of a fully intact Dirac cone. Unlike Ni(11

Externí odkaz: http://arxiv.org/abs/1212.6866

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