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Matsubara Y, Takahashi KS, Bahramy MS, Kozuka Y, Maryenko D, Falson J, Tsukazaki A, Tokura Y, Kawasaki M. Observation of the quantum Hall effect in δ-doped SrTiO3. Nat Commun 2016; 7:11631. [PMID: 27228903 PMCID: PMC4894966 DOI: 10.1038/ncomms11631] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2015] [Accepted: 04/15/2016] [Indexed: 11/09/2022] Open
Abstract
The quantum Hall effect is a macroscopic quantum phenomenon in a two-dimensional electron system. The two-dimensional electron system in SrTiO3 has sparked a great deal of interest, mainly because of the strong electron correlation effects expected from the 3d orbitals. Here we report the observation of the quantum Hall effect in a dilute La-doped SrTiO3-two-dimensional electron system, fabricated by metal organic molecular-beam epitaxy. The quantized Hall plateaus are found to be solely stemming from the low Landau levels with even integer-filling factors, ν=4 and 6 without any contribution from odd ν's. For ν=4, the corresponding plateau disappears on decreasing the carrier density. Such peculiar behaviours are proposed to be due to the crossing between the Landau levels originating from the two subbands composed of d orbitals with different effective masses. Our findings pave a way to explore unprecedented quantum phenomena in d-electron systems.
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Affiliation(s)
- Y. Matsubara
- RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
- Institute for Materials Research, Tohoku University, Sendai 908-8577, Japan
| | - K. S. Takahashi
- RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
- PRESTO, Japan Science and Technology Agency (JST), Chiyoda-ku, Tokyo 102-0075, Japan
| | - M. S. Bahramy
- RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
- Department of Applied Physics and Quantum Phase Electronics Center, University of Tokyo, Tokyo 113-8656, Japan
| | - Y. Kozuka
- Department of Applied Physics and Quantum Phase Electronics Center, University of Tokyo, Tokyo 113-8656, Japan
| | - D. Maryenko
- RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
| | - J. Falson
- Department of Applied Physics and Quantum Phase Electronics Center, University of Tokyo, Tokyo 113-8656, Japan
| | - A. Tsukazaki
- Institute for Materials Research, Tohoku University, Sendai 908-8577, Japan
| | - Y. Tokura
- RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
- Department of Applied Physics and Quantum Phase Electronics Center, University of Tokyo, Tokyo 113-8656, Japan
| | - M. Kawasaki
- RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan
- Department of Applied Physics and Quantum Phase Electronics Center, University of Tokyo, Tokyo 113-8656, Japan
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Hembree CE, Mason BA, Kwiatkowski JT, Furneaux JE, Slinkman JA. Calculations of the spin dependence of transport and optical properties in wide parabolic quantum wells. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 50:15197-15209. [PMID: 9975874 DOI: 10.1103/physrevb.50.15197] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Raikh ME, Shahbazyan TV. Magnetointersubband oscillations of conductivity in a two-dimensional electronic system. PHYSICAL REVIEW. B, CONDENSED MATTER 1994; 49:5531-5540. [PMID: 10011508 DOI: 10.1103/physrevb.49.5531] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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