Journal article
Unconventional quantum oscillations and evidence of nonparabolic electronic states in quasi-two-dimensional electron system at complex oxide interfaces
Physical review research, Vol.6(4), 043231
12/03/2024
DOI: 10.1103/physrevresearch.6.043231
Abstract
The simultaneous occurrence of electric-field controlled superconductivity and spin-orbit interaction makes two-dimensional electron systems (2DES) constructed from perovskite transition metal oxides promising candidates for the next generation of spintronics and quantum computing. It is, however, essential to understand the electronic bands thoroughly and verify the predicted electronic states experimentally in these 2DES to advance technological applications. Here, we present insights into the electronic states of the 2DES at oxide interfaces through comprehensive investigations of Shubnikov–de Haas oscillations in three different systems: EuO/KTaO3, LaAlO3/SrTiO3, and amorphous-LaAlO3/KTaO3. To accurately resolve these oscillations, we conducted transport measurements in high magnetic fields up to 60 T and low temperatures down to 100 mK. For 2D confined electrons at these interfaces, we observed a progressive increase of oscillations frequency and cyclotron mass with the magnetic field. We interpret these universal and intriguing findings by considering the existence of nontrivial electronic bands, for which the 𝐸−𝑘 dispersion incorporates both linear and parabolic relations. In addition to providing experimental evidence for nonparabolic electronic states in KTaO3 and SrTiO3 2DES, the unconventional oscillations presented in this study establish a paradigm for quantum oscillations in 2DES based on perovskite transition metal oxides, where the oscillation frequencies in 1/𝐵 exhibit quadratic dependence on the magnetic field.
Details
- Title: Subtitle
- Unconventional quantum oscillations and evidence of nonparabolic electronic states in quasi-two-dimensional electron system at complex oxide interfaces
- Creators
- Km Rubi - Los Alamos National LaboratoryDenis R. Candido - University of IowaManish Dumen - Institute of Nano Science and TechnologyShengwei Zeng - National University of SingaporeAndrew Ammerlaan - Radboud University NijmegenFemke Bangma - Radboud University NijmegenMun K. Chan - Los Alamos National LaboratoryMichel Goiran - Université de ToulouseAriando Ariando - National University of SingaporeSuvankar Chakraverty - Institute of Nano Science and TechnologyWalter Escoffier - Université de ToulouseUli Zeitler - Radboud University NijmegenNeil Harrison - Los Alamos National Laboratory
- Resource Type
- Journal article
- Publication Details
- Physical review research, Vol.6(4), 043231
- Publisher
- American Physical Society
- DOI
- 10.1103/physrevresearch.6.043231
- ISSN
- 2643-1564
- eISSN
- 2643-1564
- Language
- English
- Date published
- 12/03/2024
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984757198502771
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