Journal
APPLIED PHYSICS LETTERS
Volume 114, Issue 23, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.5090269
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Funding
- Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [DE-AC02-76SF00515]
- NSF Graduate Research Fellowship [DGE-114747]
- Gordon and Betty Moore Foundation's EPiQS Initiative [GBMF4415]
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Oxide heterostructures are an attractive platform for incorporation in field-effect transistors (FETs) due to their diverse physical properties which can be tuned by electrostatic gating. We report a top-gated FET based on a SrTiO3 delta-doped structure, which operates down to cryogenic temperatures. The device shows excellent DC characteristics with an on/off ratio greater than 10(4) and field effect mobility estimated to be 2125cm(2)/Vs at 2K. The high field effect mobility was consistent with the Hall mobility and is attributed to the formation of a two-dimensional electron system in the delta-doped layer: two-dimensional gate-tunable Shubnikov-de Haas oscillations confirm this. The achievement of an electron density of 3x10(12)cm(-2) in a gate-tunable geometry allows for the exploration of the interplay between magnetic, ferroelectric, and superconducting properties of SrTiO3 in the quantum limit.
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