Detection of charge density wave phase transitions at 1T-TaS2/GaAs interfaces

Zhu, Xiaochen; Li, Ang J.; Stewart, G. R.; Hebard, Arthur F.

doi:10.1063/1.4982964

Title: Detection of charge density wave phase transitions at 1T-TaS₂/GaAs interfaces

Journal Article · Wed May 03 00:00:00 EDT 2017 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4982964· OSTI ID:1466214

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Univ. of Florida, Gainesville, FL (United States). Dept. of Physics

The transition metal dichalcogenide 1T-TaS₂ is well known to harbor a rich variety of charge density wave (CDW) distortions which are correlated with underlying lattice atom modulations. The long range CDW phases extend throughout the whole crystal and terminate with charge displacements at the crystal boundaries. In this paper, we report on the transport properties and capacitance characteristics of the interface between freshly exfoliated flakes of 1T-TaS₂ in intimate van der Waals contact with n-type GaAs substrates. The extracted barrier parameters (ideality, barrier height, and built-in potential) experience pronounced changes across the Mott-CDW transition in the 1T-TaS₂. Finally, the CDW-induced changes in barrier properties are well described by a bond polarization model which upon decreasing temperature gives rise to an increased potential drop across the interfacial region due to the localization of carriers and a decreased dielectric constant.

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Research Organization:: Univ. of Florida, Gainesville, FL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)

Grant/Contract Number:: FG02-86ER45268; DMR-1305783

OSTI ID:: 1466214

Alternate ID(s):: OSTI ID: 1361870

Journal Information:: Applied Physics Letters, Vol. 110, Issue 18; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 7 works

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Low Temperature Specific Heat of Layered Transition Metal Dichalcogenides Stewart, G. R. Journal of Superconductivity and Novel Magnetism, Vol. 33, Issue 1 https://doi.org/10.1007/s10948-019-05278-3	journal	October 2019

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Title: Detection of charge density wave phase transitions at 1T-TaS2/GaAs interfaces

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Title: Detection of charge density wave phase transitions at 1T-TaS₂/GaAs interfaces