Work

Non-invasive detection of a deeply buried two-dimensional electron gas at the LaFeO3/SrTiO3 interface via Giant top interdigital capacitance

Year: 2025

Type: article

Abstract: In this study, we investigate the properties of LaFeO 3 thin films epitaxially grown on untreated single crystal SrTiO 3 substrates and propose a new method of detecting the deeply buried conductive interface of the crystalline LaFeO 3 /SrTiO 3 heterostructure, by using remote capacitance measurements via interdigital electrodes deposited on the top surface. To the best of our knowledge, this is the first non-invasive detection of a buried two-dimensional electron gas (2DEG) using top capacitance measurements in this configuration. Moreover, the 2DEG is detected at a crystalline polar-nonpolar interface on untreated SrTiO 3 substrates, with previous studies mostly focusing on treated substrates. The huge planar top capacitance, linked to the presence of a 2DEG at the bottom interface, could be further modulated and could open the way to novel device applications.

Source: Applied Surface Science

DOI: 10.1016/j.apsusc.2025.163782

Authors: Ioan M. Ghitiu, Mihai Zamfir, Elena I. Bancu, Floriana Craciun, Maria Dinescu, Nicu D. Scarisoreanu

Institutions: University of Bucharest, National Institute for Laser Plasma and Radiation Physics, Institute of Structure of Matter

Language: English

Topic: Electronic and Structural Properties of Oxides

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $3,930

Funder: Unitatea Executiva pentru Finantarea Invatamantului Superior, a Cercetarii, Dezvoltarii si Inovarii