Observation of Zero-Field Transverse Resistance in Interface Devices

P. W. Krantz, V. Chandrasekhar

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Domain walls in () interface devices at low temperatures give a rise to a new signature in the electrical transport of two-dimensional carrier gases formed at the surfaces or interfaces of STO-based heterostructures: a finite transverse resistance observed in Hall bars in zero external magnetic field. This transverse resistance depends on the local domain wall configuration and hence changes with temperature, gate voltage, thermal cycling, and position along the sample and can even change sign as a function of these parameters. The transverse resistance is observed below but grows and changes significantly below , the temperature at which the domain walls become increasingly polar. Surprisingly, the transverse resistance is much larger in (111) oriented heterostructures in comparison to (001) oriented heterostructures. Measurements of the capacitance between the conducting interface and an electrode applied to the substrate, which reflect the dielectric constant of the STO, indicate that this difference may be related to the greater variation of the temperature-dependent dielectric constant with electric field when the electric field is applied in the [111] direction. The finite transverse resistance can be explained inhomogeneous current flow due to the preferential transport of current along domain walls that are askew to the nominal direction of the injected current.

Original languageEnglish (US)
Article number036801
JournalPhysical review letters
Volume127
Issue number3
DOIs
StatePublished - Jul 16 2021

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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