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Two-dimensional electron gas with six-fold symmetry at the (111) surface of KTaO3
Zitieren Sie bitte immer diese URN: urn:nbn:de:bvb:20-opus-117703
- Two-dimensional electron gases (2DEGs) at transition-metal oxide (TMO) interfaces, and boundary states in topological insulators, are being intensively investigated. The former system harbors superconductivity, large magneto-resistance, and ferromagnetism. In the latter, honeycomb-lattice geometry plus bulk spin-orbit interactions lead to topologically protected spin-polarized bands. 2DEGs in TMOs with a honeycomb-like structure could yield new states of matter, but they had not been experimentally realized, yet. We successfully created a 2DEGTwo-dimensional electron gases (2DEGs) at transition-metal oxide (TMO) interfaces, and boundary states in topological insulators, are being intensively investigated. The former system harbors superconductivity, large magneto-resistance, and ferromagnetism. In the latter, honeycomb-lattice geometry plus bulk spin-orbit interactions lead to topologically protected spin-polarized bands. 2DEGs in TMOs with a honeycomb-like structure could yield new states of matter, but they had not been experimentally realized, yet. We successfully created a 2DEG at the (111) surface of KTaO3, a strong insulator with large spin-orbit coupling. Its confined states form a network of weakly-dispersing electronic gutters with 6-fold symmetry, a topology novel to all known oxide-based 2DEGs. If those pertain to just one Ta-(111) bilayer, model calculations predict that it can be a topological metal. Our findings demonstrate that completely new electronic states, with symmetries not realized in the bulk, can be tailored in oxide surfaces, promising for TMO-based devices.…
Autor(en): | C. Bareille, F. Fortuna, T. C. Rödel, F. Bertran, M. Gabay, O. Hijano Cubelos, A. Taleb-Ibrahimi, P. Le Fèvre, M. Bibes, A. Barthelemy, T. Maroutian, P. Lecoeur, M. J. Rozenberg, A. F. Santander-Syro |
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URN: | urn:nbn:de:bvb:20-opus-117703 |
Dokumentart: | Artikel / Aufsatz in einer Zeitschrift |
Institute der Universität: | Fakultät für Physik und Astronomie / Physikalisches Institut |
Sprache der Veröffentlichung: | Englisch |
Titel des übergeordneten Werkes / der Zeitschrift (Englisch): | Scientific Reports |
ISSN: | 2045-2322 |
Erscheinungsjahr: | 2014 |
Band / Jahrgang: | 4 |
Seitenangabe: | 3586 |
Originalveröffentlichung / Quelle: | Scientific Reports, 4, 3586; DOI:10.1038/srep03586 (2014). |
DOI: | https://doi.org/10.1038/srep03586 |
PubMed-ID: | https://pubmed.ncbi.nlm.nih.gov/24394996 |
Allgemeine fachliche Zuordnung (DDC-Klassifikation): | 5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik |
Freie Schlagwort(e): | LAALO3/SRTIO3 interfaces; SRTIO3; oxides; superconductivity; topological insulators |
Datum der Freischaltung: | 24.08.2015 |
Lizenz (Deutsch): | CC BY-NC-ND: Creative-Commons-Lizenz: Namensnennung, Nicht kommerziell, Keine Bearbeitung |