DPG Phi
Verhandlungen
Verhandlungen
DPG

Dresden 2026 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

HL: Fachverband Halbleiterphysik

HL 10: 2D Materials II – Electronic and transport properties (joint session HL/TT)

HL 10.1: Vortrag

Montag, 9. März 2026, 15:00–15:15, POT/0081

Ballistic electrostatic graphene superlattices using He ion-milled etching masks — •Rebecca Hoffmann1, Giulia Piccinini1, Julien Barrier1, David Barcons Ruiz1, Hanan Herzig Sheinfux1, Takashi Taniguchi2, Kenji Watanabe3, Adrian Bachtold1,4, and Frank H.L. Koppens1,41ICFO-Institut de Ciencies Fotoniques, Castelldefels, Spain. — 2International Center for Materials Nanoarchitectonics, NIMS, Tsukuba, Japan — 3Research Center for Functional Materials, NIMS, Tsukuba, Japan — 4ICREA-Institució Catalana de Recerca i Estudis Avançats, Barcelona, Spain

An electrostatic superlattice is created by applying a periodic electrostatic potential to a material using patterned gates or dielectrics, leading to tunable band structure reconstruction. This approach enables free design of the superlattice geometry and lattice period. While high mobility has been observed, signatures of ballistic transport (e.g. negative resistance in cross geometry, transverse magnetic focusing) remain to be reported. Here, we present a nanofabrication technique combining Helium ion milling of etching masks with damage-free etching of graphite gates [1]. Using these gates in a graphene heterostructure creates an electrostatic superlattice which preserves graphene's high mobility. We report superlattice features. The high electronic quality is confirmed by transverse magnetic focusing and device-size limited mean free path.

[1]D. Barcons Ruiz, et al., Nat. Commun. 13, 6926 (2022)

Keywords: graphene; superlattice; 2D materials; transport

100% | Mobil-Ansicht | English Version | Kontakt/Impressum/Datenschutz
DPG-Physik > DPG-Verhandlungen > 2026 > Dresden