Abstract
Quantum materials (QMs) with strong correlation and nontrivial topology are indispensable to next-generation information and computing technologies. Exploitation of topological band structure is an ideal starting point to realize correlated topological QMs. Here, we report that strain-induced symmetry modification in correlated oxide SrNbO3 thin films creates an emerging topological band structure. Dirac electrons in strained SrNbO3 films reveal ultrahigh mobility (μmax ≈ 100,000 cm2/Vs), exceptionally small effective mass (m* ~ 0.04me), and nonzero Berry phase. Strained SrNbO3 films reach the extreme quantum limit, exhibiting a sign of fractional occupation of Landau levels and giant mass enhancement. Our results suggest that symmetry-modified SrNbO3 is a rare example of correlated oxide Dirac semimetals, in which strong correlation of Dirac electrons leads to the realization of a novel correlated topological QM.
Original language | English |
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Article number | eabf9631 |
Journal | Science Advances |
Volume | 7 |
Issue number | 38 |
DOIs | |
State | Published - Sep 2021 |
Funding
This work was supported by the U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division, and in part by the Computational Materials Sciences Program. The high-magnetic field measurements were performed at the National High Magnetic Field Laboratory, which is supported by NSF cooperative agreement no. DMR-1644779 and the state of Florida. This research used resources of the Advanced Photon Source, a DOE Office of Science User Facility, operated for the DOE Office of Science by Argonne National Laboratory under contract no. DE-AC02-06CH11357. Extraordinary facility operations were supported, in part, by the DOE Office of Science through the National Virtual Biotechnology Laboratory, a consortium of DOE national laboratories focused on the response to COVID-19, with funding provided by the Coronavirus CARES Act. W.S.C. was supported by Basic Science Research Programs through the National Research Foundation of Korea (NRF) (NRF-2021R1A2C2011340). J.L. acknowledges support from NSF (PHY-1913034) and Vannevar Bush Faculty Fellowship (N00014-15-1-2847).