Infrared spectroscopy of two-dimensional electron systems
Artikel i vetenskaplig tidskrift, 2019

© 2019, EDP Sciences, Springer-Verlag GmbH Germany, part of Springer Nature. We have used grazing-angle infrared spectroscopy with polarized radiation to detect the Berreman effect (BE) in the two-dimensional electron systems (2DES) which form spontaneously at two interfaces: one between an amorphous film LaAlO3 and its SrTiO3 substrate (LAO/STO), and another at the interface between the topological insulator (TI) Bi2Se3 and its sapphire substrate. In both systems we have thus extracted the 2DES parameters at different temperatures. In the quasi-2DES under amorphous LAO, the surface density ns is higher than under crystalline LAO, while the mobility is nearly the same and the thickness d is 7 nm. In ultrapure Bi2Se3 on sapphire, preliminary data provided d < 1 nm and ns ≈ 1013 cm−2, indicating, by comparison with existing estimates, that the BE indeed detects the topological surface states.

Författare

P. Calvani

Sapienza, Università di Roma

Alexei Kalaboukhov

Chalmers, Mikroteknologi och nanovetenskap (MC2), Kvantkomponentfysik

Pavel P. Shibayev

Rutgers, The State University of New Jersey

M. Salehi

Rutgers, The State University of New Jersey

J. Moon

Rutgers, The State University of New Jersey

Seongshik Oh

Rutgers, The State University of New Jersey

E. Falsetti

Sapienza, Università di Roma

M. Ortolani

Sapienza, Università di Roma

F. Miletto Granozio

Universita degli Studi di Napoli Federico II

J. B. Brubach

SOLEIL Synchrotron

P. Roy

SOLEIL Synchrotron

A. Nucara

Sapienza, Università di Roma

European Physical Journal: Special Topics

1951-6355 (ISSN) 1951-6401 (eISSN)

Vol. 228 3 669-673

Ämneskategorier

Atom- och molekylfysik och optik

Annan fysik

Den kondenserade materiens fysik

DOI

10.1140/epjst/e2019-800145-7

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Senast uppdaterat

2019-07-08