Spectroscopy of Multielectrode Tunnel Barriers

Shirkhorshidian, Amir; Gamble, John King; Maurer, Leon; Carr, Stephen M.; Dominguez, Jason; Ten Eyck, Gregory A.; Wendt, Joel R.; Nielsen, Erik; Jacobson, Noah Tobias; Lilly, Michael P.; Carroll, Malcolm S.

doi:10.1103/PhysRevApplied.10.044003

Spectroscopy of Multielectrode Tunnel Barriers

Journal Article · Mon Oct 01 00:00:00 EDT 2018 · Physical Review Applied

DOI:https://doi.org/10.1103/PhysRevApplied.10.044003· OSTI ID:1478064

Shirkhorshidian, Amir ^[1]; Gamble, John King ^[2]; Maurer, Leon ^[3]; Carr, Stephen M. ^[3]; Dominguez, Jason ^[3]; Ten Eyck, Gregory A. ^[3]; Wendt, Joel R. ^[3]; Nielsen, Erik ^[3]; Jacobson, Noah Tobias ^[3]; Lilly, Michael P. ^[3]; Carroll, Malcolm S. ^[3]

Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Univ. of New Mexico, Albuquerque, NM (United States)
Microsoft Research, Redmond, WA (United States)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Despite their ubiquity in nanoscale electronic devices, the physics of tunnel barriers has not been developed to the extent necessary for the engineering of devices in the few-electron regime. This problem is of urgent interest, as this is the specific regime into which current extreme-scale electronics fall. Here, we propose theoretically and validate experimentally a compact model for multielectrode tunnel barriers, suitable for design-rules-based engineering of tunnel junctions in quantum devices. We perform transport spectroscopy at approximately T = 4 K, extracting effective barrier heights and widths for a wide range of biases, using an efficient Landauer-Büttiker tunneling model to perform the analysis. We find that the barrier height shows several regimes of voltage dependence, either linear or approximately exponential. Effects on threshold, such as metal-insulator transition and lateral confinement, are included because they influence parameters that determine barrier height and width (e.g., the Fermi energy and local electric fields). We compare these results to semiclassical solutions of Poisson’s equation and find them to agree qualitatively. Finally, this characterization technique is applied to an efficient lateral tunnel barrier design that does not require an electrode directly above the barrier region in order to estimate barrier heights and widths.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC04-94AL85000

OSTI ID:: 1478064

Alternate ID(s):: OSTI ID: 1478378
OSTI ID: 1478406

Report Number(s):: SAND--2018-7603J; 665778

Journal Information:: Physical Review Applied, Journal Name: Physical Review Applied Journal Issue: 4 Vol. 10; ISSN 2331-7019; ISSN PRAHB2

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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