EconPapers    
Economics at your fingertips  
 

Low temperature near-field fingerprint spectroscopy of 2D electron systems in oxide heterostructures and beyond

Julian Barnett, Konstantin G. Wirth, Richard Hentrich, Yasin C. Durmaz, Marc-André Rose, Felix Gunkel and Thomas Taubner ()
Additional contact information
Julian Barnett: RWTH Aachen University
Konstantin G. Wirth: RWTH Aachen University
Richard Hentrich: attocube systems GmbH
Yasin C. Durmaz: attocube systems GmbH
Marc-André Rose: Forschungszentrum Jülich
Felix Gunkel: Forschungszentrum Jülich
Thomas Taubner: RWTH Aachen University

Nature Communications, 2025, vol. 16, issue 1, 1-9

Abstract: Abstract Confined electron systems, such as 2D electron gases (2DEGs), 2D materials, or topological insulators, show great technological promise but their susceptibility to defects often results in nanoscale inhomogeneities with unclear origins. Scattering-type scanning near-field optical microscopy (s-SNOM) is useful to investigate buried confined electron systems non-destructively with nanoscale resolution, however, a clear separation of carrier concentration and mobility was so far impossible in s-SNOM. Here, we predict a previously inaccessible characteristic “fingerprint” response of the prototypical LaAlO3/SrTiO3 2DEG, and verify it using a state-of-the-art tunable narrow-band laser in mid-infrared cryo-s-SNOM at 8 K. Our modeling allows us to separate the influence of carrier concentration and mobility on fingerprint spectra and to characterize 2DEG inhomogeneities on the nanoscale. Finally, we model the surface accumulation layer in doped InAs, to show that our fingerprint spectra are a universal feature and generally applicable to confined electron systems, like topological insulators or stacked van-der-Waals materials.

Date: 2025
References: Add references at CitEc
Citations:

Downloads: (external link)
https://www.nature.com/articles/s41467-025-59633-1 Abstract (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-59633-1

Ordering information: This journal article can be ordered from
https://www.nature.com/ncomms/

DOI: 10.1038/s41467-025-59633-1

Access Statistics for this article

Nature Communications is currently edited by Nathalie Le Bot, Enda Bergin and Fiona Gillespie

More articles in Nature Communications from Nature
Bibliographic data for series maintained by Sonal Shukla () and Springer Nature Abstracting and Indexing ().

 
Page updated 2025-05-15
Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-59633-1