Electronic subbands in the a-LaAlO_{3}/KTaO_{3} interface revealed by quantum oscillations in high magnetic fields
Investigating Shubnikov-de Haas (SdH) oscillations in high magnetic fields, we experimentally infer the electronic band structure of the quasi-two-dimensional electron gas (2DEG) at the ionic-liquid gated amorphous (a)-LaAlO_{3}/KTaO_{3} interface. The angular dependence of SdH oscillations indicate...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2021-09-01
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| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.3.033234 |
| _version_ | 1797210934276521984 |
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| author | Km Rubi Shengwei Zeng Femke Bangma Michel Goiran A. Ariando Walter Escoffier Uli Zeitler |
| author_facet | Km Rubi Shengwei Zeng Femke Bangma Michel Goiran A. Ariando Walter Escoffier Uli Zeitler |
| author_sort | Km Rubi |
| collection | DOAJ |
| description | Investigating Shubnikov-de Haas (SdH) oscillations in high magnetic fields, we experimentally infer the electronic band structure of the quasi-two-dimensional electron gas (2DEG) at the ionic-liquid gated amorphous (a)-LaAlO_{3}/KTaO_{3} interface. The angular dependence of SdH oscillations indicates a 2D confinement of a majority of electrons at the interface. However, additional SdH oscillations with an angle-independent frequency observed at high tilt angles indicate the coexistence of 3D charge carriers extending deep into the KTaO_{3}. The SdH oscillations measured in magnetic fields perpendicular to the interface show four frequencies corresponding to four 2D subbands with different effective masses (0.20m_{e}−0.55m_{e}). The single-frequency oscillations originating from 3D electrons yields a larger effective mass of ∼0.70m_{e}. Overall, the inferred subbands are in good agreement with the theoretical calculations and angle-resolved photoemission spectroscopy studies on 2DEG at KTaO_{3} surface. |
| first_indexed | 2024-04-24T10:18:29Z |
| format | Article |
| id | doaj.art-77f97e852f04415f947e673453187489 |
| institution | Directory Open Access Journal |
| issn | 2643-1564 |
| language | English |
| last_indexed | 2024-04-24T10:18:29Z |
| publishDate | 2021-09-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Research |
| spelling | doaj.art-77f97e852f04415f947e6734531874892024-04-12T17:13:47ZengAmerican Physical SocietyPhysical Review Research2643-15642021-09-013303323410.1103/PhysRevResearch.3.033234Electronic subbands in the a-LaAlO_{3}/KTaO_{3} interface revealed by quantum oscillations in high magnetic fieldsKm RubiShengwei ZengFemke BangmaMichel GoiranA. AriandoWalter EscoffierUli ZeitlerInvestigating Shubnikov-de Haas (SdH) oscillations in high magnetic fields, we experimentally infer the electronic band structure of the quasi-two-dimensional electron gas (2DEG) at the ionic-liquid gated amorphous (a)-LaAlO_{3}/KTaO_{3} interface. The angular dependence of SdH oscillations indicates a 2D confinement of a majority of electrons at the interface. However, additional SdH oscillations with an angle-independent frequency observed at high tilt angles indicate the coexistence of 3D charge carriers extending deep into the KTaO_{3}. The SdH oscillations measured in magnetic fields perpendicular to the interface show four frequencies corresponding to four 2D subbands with different effective masses (0.20m_{e}−0.55m_{e}). The single-frequency oscillations originating from 3D electrons yields a larger effective mass of ∼0.70m_{e}. Overall, the inferred subbands are in good agreement with the theoretical calculations and angle-resolved photoemission spectroscopy studies on 2DEG at KTaO_{3} surface.http://doi.org/10.1103/PhysRevResearch.3.033234 |
| spellingShingle | Km Rubi Shengwei Zeng Femke Bangma Michel Goiran A. Ariando Walter Escoffier Uli Zeitler Electronic subbands in the a-LaAlO_{3}/KTaO_{3} interface revealed by quantum oscillations in high magnetic fields Physical Review Research |
| title | Electronic subbands in the a-LaAlO_{3}/KTaO_{3} interface revealed by quantum oscillations in high magnetic fields |
| title_full | Electronic subbands in the a-LaAlO_{3}/KTaO_{3} interface revealed by quantum oscillations in high magnetic fields |
| title_fullStr | Electronic subbands in the a-LaAlO_{3}/KTaO_{3} interface revealed by quantum oscillations in high magnetic fields |
| title_full_unstemmed | Electronic subbands in the a-LaAlO_{3}/KTaO_{3} interface revealed by quantum oscillations in high magnetic fields |
| title_short | Electronic subbands in the a-LaAlO_{3}/KTaO_{3} interface revealed by quantum oscillations in high magnetic fields |
| title_sort | electronic subbands in the a laalo 3 ktao 3 interface revealed by quantum oscillations in high magnetic fields |
| url | http://doi.org/10.1103/PhysRevResearch.3.033234 |
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