Unconventional quantum oscillations and evidence of nonparabolic electronic states in quasi-two-dimensional electron system at complex oxide interfaces
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, e...
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| Format: | Article |
| Language: | English |
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American Physical Society
2024-12-01
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| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.6.043231 |
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| author | Km Rubi Denis R. Candido Manish Dumen Shengwei Zeng Emily L.Q.N. Ammerlaan Femke Bangma Mun K. Chan Michel Goiran Ariando Ariando Suvankar Chakraverty Walter Escoffier Uli Zeitler Neil Harrison |
| author_facet | Km Rubi Denis R. Candido Manish Dumen Shengwei Zeng Emily L.Q.N. Ammerlaan Femke Bangma Mun K. Chan Michel Goiran Ariando Ariando Suvankar Chakraverty Walter Escoffier Uli Zeitler Neil Harrison |
| author_sort | Km Rubi |
| collection | DOAJ |
| description | 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/KTaO_{3}, LaAlO_{3}/SrTiO_{3}, and amorphous-LaAlO_{3}/KTaO_{3}. 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 KTaO_{3} and SrTiO_{3} 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. |
| format | Article |
| id | doaj-art-063aa92fbe204fed88dc786b88f4d7e2 |
| institution | Kabale University |
| issn | 2643-1564 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Research |
| spelling | doaj-art-063aa92fbe204fed88dc786b88f4d7e22025-02-06T17:04:09ZengAmerican Physical SocietyPhysical Review Research2643-15642024-12-016404323110.1103/PhysRevResearch.6.043231Unconventional quantum oscillations and evidence of nonparabolic electronic states in quasi-two-dimensional electron system at complex oxide interfacesKm RubiDenis R. CandidoManish DumenShengwei ZengEmily L.Q.N. AmmerlaanFemke BangmaMun K. ChanMichel GoiranAriando AriandoSuvankar ChakravertyWalter EscoffierUli ZeitlerNeil HarrisonThe 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/KTaO_{3}, LaAlO_{3}/SrTiO_{3}, and amorphous-LaAlO_{3}/KTaO_{3}. 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 KTaO_{3} and SrTiO_{3} 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.http://doi.org/10.1103/PhysRevResearch.6.043231 |
| spellingShingle | Km Rubi Denis R. Candido Manish Dumen Shengwei Zeng Emily L.Q.N. Ammerlaan Femke Bangma Mun K. Chan Michel Goiran Ariando Ariando Suvankar Chakraverty Walter Escoffier Uli Zeitler Neil Harrison Unconventional quantum oscillations and evidence of nonparabolic electronic states in quasi-two-dimensional electron system at complex oxide interfaces Physical Review Research |
| title | Unconventional quantum oscillations and evidence of nonparabolic electronic states in quasi-two-dimensional electron system at complex oxide interfaces |
| title_full | Unconventional quantum oscillations and evidence of nonparabolic electronic states in quasi-two-dimensional electron system at complex oxide interfaces |
| title_fullStr | Unconventional quantum oscillations and evidence of nonparabolic electronic states in quasi-two-dimensional electron system at complex oxide interfaces |
| title_full_unstemmed | Unconventional quantum oscillations and evidence of nonparabolic electronic states in quasi-two-dimensional electron system at complex oxide interfaces |
| title_short | Unconventional quantum oscillations and evidence of nonparabolic electronic states in quasi-two-dimensional electron system at complex oxide interfaces |
| title_sort | unconventional quantum oscillations and evidence of nonparabolic electronic states in quasi two dimensional electron system at complex oxide interfaces |
| url | http://doi.org/10.1103/PhysRevResearch.6.043231 |
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