Charge Transfer and Orbital Reconstruction at an Organic–Oxide Interface

• DOI: 10.1021/acs.nanolett.3c03713
• Publication Date: 2023-11-29T19:52:05Z
• Authors: Marco Caputo; Michał Studniarek; Eduardo Bonini Gu...; Luca Schio; Kassymkhan Baiseitov; Niéli Daffé; Nicolas Bachellier; Alla Chikina; Giovanni Di Santo; Alberto Verdini; Andrea Goldoni; Matthias Muntwiler; Cinthia Piamonteze; Luca Floreano; Milan Radovic; Jan Dreiser
• Keywords: STO; TCNQ; charge transfer; orbital reorganization; conductivity; 7. Clean energy

The two-dimensional electron system (2DES) located at the surface of strontium titanate (STO) and at several other STO-based interfaces has been an established platform for the study of novel physical phenomena since its discovery. Here we report how the interfacing of STO and tetracyanoquinodimethane (TCNQ) results in a charge transfer that depletes the number of free carriers at the STO surface, with a strong impact on its electronic structure. Our study paves the way for efficient tuning of the electronic properties, which promises novel applications in the framework of oxide/organic-based electronics.