Current browse context:
cond-mat.mes-hall
Change to browse by:
References & Citations
Condensed Matter > Mesoscale and Nanoscale Physics
Title: Electron Collimation in Twisted Bilayer Graphene via Gate-defined Moiré Barriers
(Submitted on 31 Mar 2024)
Abstract: Electron collimation via a graphene pn-junction allows electrostatic control of ballistic electron trajectories akin to that of an optical circuit. Similar manipulation of novel correlated electronic phases in twisted-bilayer graphene (tBLG) can provide additional probes to the underlying physics and device components towards advanced quantum electronics. In this work, we demonstrate collimation of the electron flow via gate-defined moir\'e barriers in a tBLG device, utilizing the band-insulator gap of the moir\'e superlattice. A single junction can be tuned to host a chosen combination of conventional pseudo barrier and moir\'e tunnel barriers, from which we demonstrate improved collimation efficiency. By measuring transport through two consecutive moir\'e collimators separated by 1 um, we demonstrate evidence of electron collimation in tBLG in the presence of realistic twist-angle inhomogeneity.
Link back to: arXiv, form interface, contact.