Tuning the electronic properties at the surface of BaBiO3 thin films

The presence of 2D electron gases at surfaces or interfaces in oxide thin films remains a hot topic in condensed matter physics. In particular, BaBiO3 appears as a very interesting system as it was theoretically proposed that its (001) surface should become metallic if a Bi-termination is achieved (...

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Autores principales: Ferreyra, C., Guller, F., Marchini, F., Lüders, U., Albornoz, C., Leyva, A.G., Williams, F.J., Llois, A.M., Vildosola, V., Rubi, D.
Formato: JOUR
Materias:
Barium compounds
Calculations
Condensed matter physics
Electron gas
Electronic properties
Energy gap
Film preparation
Interfaces (materials)
Oxide films
Perovskite
Pulsed laser deposition
Semiconductor doping
Electron-doping
Electronic band gaps
First-principles calculation
Growth conditions
Oxide heterostructures
Oxide thin films
Surface conductivity
Surface effect
Thin films
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_21583226_v6_n6_p_Ferreyra
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_21583226_v6_n6_p_Ferreyra2023-10-03T16:39:30Z Tuning the electronic properties at the surface of BaBiO3 thin films Ferreyra, C. Guller, F. Marchini, F. Lüders, U. Albornoz, C. Leyva, A.G. Williams, F.J. Llois, A.M. Vildosola, V. Rubi, D. Barium compounds Calculations Condensed matter physics Electron gas Electronic properties Energy gap Film preparation Interfaces (materials) Oxide films Perovskite Pulsed laser deposition Semiconductor doping Electron-doping Electronic band gaps First-principles calculation Growth conditions Oxide heterostructures Oxide thin films Surface conductivity Surface effect Thin films The presence of 2D electron gases at surfaces or interfaces in oxide thin films remains a hot topic in condensed matter physics. In particular, BaBiO3 appears as a very interesting system as it was theoretically proposed that its (001) surface should become metallic if a Bi-termination is achieved (Vildosola et al., PRL 110, 206805 (2013)). Here we report on the preparation by pulsed laser deposition and characterization of BaBiO3 thin films on silicon. We show that the texture of the films can be tuned by controlling the growth conditions, being possible to stabilize strongly (100)-textured films. We find significant differences on the spectroscopic and transport properties between (100)-textured and non-textured films. We rationalize these experimental results by performing first principles calculations, which indicate the existence of electron doping at the (100) surface. This stabilizes Bi ions in a 3+ state, shortens Bi-O bonds and reduces the electronic band gap, increasing the surface conductivity. Our results emphasize the importance of surface effects on the electronic properties of perovskites, and provide strategies to design novel oxide heterostructures with potential interface-related 2D electron gases. © 2016 Author(s). Fil:Williams, F.J. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Llois, A.M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Vildosola, V. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Rubi, D. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_21583226_v6_n6_p_Ferreyra
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Barium compounds
Calculations
Condensed matter physics
Electron gas
Electronic properties
Energy gap
Film preparation
Interfaces (materials)
Oxide films
Perovskite
Pulsed laser deposition
Semiconductor doping
Electron-doping
Electronic band gaps
First-principles calculation
Growth conditions
Oxide heterostructures
Oxide thin films
Surface conductivity
Surface effect
Thin films
spellingShingle Barium compounds
Calculations
Condensed matter physics
Electron gas
Electronic properties
Energy gap
Film preparation
Interfaces (materials)
Oxide films
Perovskite
Pulsed laser deposition
Semiconductor doping
Electron-doping
Electronic band gaps
First-principles calculation
Growth conditions
Oxide heterostructures
Oxide thin films
Surface conductivity
Surface effect
Thin films
Ferreyra, C.
Guller, F.
Marchini, F.
Lüders, U.
Albornoz, C.
Leyva, A.G.
Williams, F.J.
Llois, A.M.
Vildosola, V.
Rubi, D.
Tuning the electronic properties at the surface of BaBiO3 thin films
topic_facet Barium compounds
Calculations
Condensed matter physics
Electron gas
Electronic properties
Energy gap
Film preparation
Interfaces (materials)
Oxide films
Perovskite
Pulsed laser deposition
Semiconductor doping
Electron-doping
Electronic band gaps
First-principles calculation
Growth conditions
Oxide heterostructures
Oxide thin films
Surface conductivity
Surface effect
Thin films
description The presence of 2D electron gases at surfaces or interfaces in oxide thin films remains a hot topic in condensed matter physics. In particular, BaBiO3 appears as a very interesting system as it was theoretically proposed that its (001) surface should become metallic if a Bi-termination is achieved (Vildosola et al., PRL 110, 206805 (2013)). Here we report on the preparation by pulsed laser deposition and characterization of BaBiO3 thin films on silicon. We show that the texture of the films can be tuned by controlling the growth conditions, being possible to stabilize strongly (100)-textured films. We find significant differences on the spectroscopic and transport properties between (100)-textured and non-textured films. We rationalize these experimental results by performing first principles calculations, which indicate the existence of electron doping at the (100) surface. This stabilizes Bi ions in a 3+ state, shortens Bi-O bonds and reduces the electronic band gap, increasing the surface conductivity. Our results emphasize the importance of surface effects on the electronic properties of perovskites, and provide strategies to design novel oxide heterostructures with potential interface-related 2D electron gases. © 2016 Author(s).
format JOUR
author Ferreyra, C.
Guller, F.
Marchini, F.
Lüders, U.
Albornoz, C.
Leyva, A.G.
Williams, F.J.
Llois, A.M.
Vildosola, V.
Rubi, D.
author_facet Ferreyra, C.
Guller, F.
Marchini, F.
Lüders, U.
Albornoz, C.
Leyva, A.G.
Williams, F.J.
Llois, A.M.
Vildosola, V.
Rubi, D.
author_sort Ferreyra, C.
title Tuning the electronic properties at the surface of BaBiO3 thin films
title_short Tuning the electronic properties at the surface of BaBiO3 thin films
title_full Tuning the electronic properties at the surface of BaBiO3 thin films
title_fullStr Tuning the electronic properties at the surface of BaBiO3 thin films
title_full_unstemmed Tuning the electronic properties at the surface of BaBiO3 thin films
title_sort tuning the electronic properties at the surface of babio3 thin films
url http://hdl.handle.net/20.500.12110/paper_21583226_v6_n6_p_Ferreyra
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