214 citations · 1.7k across the 31 of their papers we have counts for
8 papers · 1 filter
Visualization of the flat electronic band in twisted bilayer graphene near the magic angle twist
M. Iqbal Bakti Utama, Roland J. Koch, Kyunghoon Lee +15
Bilayer graphene was theorized to host a moire miniband with flat dispersion if the layers are stacked at specific twist angles known as the magic angles. Recently, such twisted bi…
Tunable Electronic Structure in Gallium Chalcogenide van der Waals Compounds
Brian Shevitski, Søren Ulstrup, Roland J. Koch +8
Transition metal monochalcogenides comprise a class of two-dimensional materials with electronic band gaps that are highly sensitive to material thickness and chemical composition.…
The Dirac nodal line network in non-symmorphic rutile semimetal RuO
Vedran Jovic, Roland J. Koch, Swarup K. Panda +11
We employ angle resolved photoemission spectroscopy (ARPES) to investigate the Fermi surface of RuO. We find a network of two Dirac nodal lines (DNL) as previously predicted in…
Rigid band shifts in two-dimensional semiconductors through environmental screening
Lutz Waldecker, Archana Raja, Malte Rösner +9
We investigate the effects of environmental dielectric screening on the electronic dispersion and the band gap in the atomically-thin, quasi two-dimensional (2D) semiconductor WS$_…
Confinement Heteroepitaxy: Realizing Atomically Thin, Half-van der Waals Materials
Natalie Briggs, Brian Bersch, Yuanxi Wang +16
Three-dimensional epitaxial heterostructures are based on covalently-bonded interfaces, whereas those from 2-dimensional (2D) materials exhibit van der Waals interactions. Under th…
Direct observation of minibands in twisted heterobilayers
Søren Ulstrup, Roland J. Koch, Simranjeet Singh +8
Stacking two-dimensional (2D) van der Waals materials with different interlayer atomic registry in a heterobilayer causes the formation of a long-range periodic superlattice that m…