Articolul precedent |
Articolul urmator |
693 0 |
SM ISO690:2012 KONOPKO, Leonid, NIKOLAEVA, Albina, HUBER, Tito. Quantum oscillations of surface states in topological insulator Bi0.83Sb0.17 nanowires. In: Materials Science and Condensed Matter Physics, Ed. 8-th Edition, 12-16 septembrie 2016, Chişinău. Chişinău: Institutul de Fizică Aplicată, 2016, Editia 8, p. 203. ISBN 978-9975-9787-1-2. |
EXPORT metadate: Google Scholar Crossref CERIF DataCite Dublin Core |
Materials Science and Condensed Matter Physics Editia 8, 2016 |
|||||||
Conferința "International Conference on Materials Science and Condensed Matter Physics" 8-th Edition, Chişinău, Moldova, 12-16 septembrie 2016 | |||||||
|
|||||||
Pag. 203-203 | |||||||
|
|||||||
Descarcă PDF | |||||||
Rezumat | |||||||
A topological insulator (TI), which is topologically distinct from an ordinary insulator, is a material with a bulk electronic excitation gap generated by the spin-orbit interaction. This distinction, characterized by a Z2 topological invariant, necessitates the existence of gapless electronic states on the sample boundary. In two dimensions (2D), the TI is a quantum spin Hall insulator. A strong TI is expected to have surface states whose Fermi surfaces enclose an odd number of Dirac points. This defines a topological metal surface phase that is predicted to have novel electronic properties. The first TI to be discovered was the alloy Bi1−xSbx, the unusual surface bands of which were mapped in an angle-resolved photoemission spectroscopy (ARPES) experiment [1]. The semiconducting alloy Bi1−xSbx is a strong TI owing to the inversion symmetry of bulk crystalline Bi and Sb. We have investigated the temperature dependence of resistance of TI Bi0.83Sb0.17 nanowires with varying diameters (75 nm ≤ d ≤ 1100 nm), obtained by radio frequency casting in a glass capillary. Owing to the quantum size effect, the energy gap ΔE with decreasing diameter of the nanowires (d from 1100 nm down to 75 nm) increases as ΔE ~ 1/d (for diameter d = 1.1 µm and d = 75 nm, ΔE = 21 and 45 meV, respectively). From the linear dependence of nanowire conductance on nanowire diameter at T = 4.2 K (Fig. 1a), we calculated the square resistance Rsq of the surface states of the nanowires to be only 70 Ohm [2]. In Bi0.83Sb0.17 nanowires with d ≤ 100 nm we discovered the Aharonov–Bohm oscillations of the longitudinal magnetoresistance with periods of one and half of flux quantum (Fig 1b). |
|||||||
|
Google Scholar Export
<meta name="citation_title" content="Quantum oscillations of surface states in topological insulator Bi0.83Sb0.17 nanowires"> <meta name="citation_author" content="Konopko Leonid"> <meta name="citation_author" content="Nikolaeva Albina"> <meta name="citation_author" content="Huber Tito"> <meta name="citation_publication_date" content="2016"> <meta name="citation_collection_title" content="Materials Science and Condensed Matter Physics"> <meta name="citation_volume" content="Editia 8"> <meta name="citation_firstpage" content="203"> <meta name="citation_lastpage" content="203"> <meta name="citation_pdf_url" content="https://ibn.idsi.md/sites/default/files/imag_file/203-203_1.pdf">