Extremely flat band in bilayer graphene | Science Advances
2018年11月9日 · We propose a novel mechanism of flat band formation based on the relative biasing of only one sublattice against other sublattices in a honeycomb lattice bilayer. The mechanism allows modification of the band dispersion from parabolic to “Mexican hat”–like through the formation of a flattened band.
Observation of flat bands in twisted bilayer graphene
2020年9月28日 · Here, we combine different imaging techniques and angle-resolved photoemission with simultaneous real- and momentum-space resolution (nano-ARPES) to directly map the band dispersion in twisted...
Controlling the Electronic Structure of Bilayer Graphene | Science …
2006年8月18日 · We describe the synthesis of bilayer graphene thin films deposited on insulating silicon carbide and report the characterization of their electronic band structure using angle-resolved photoemission. By selectively adjusting the carrier concentration in each layer, changes in the Coulomb potential led to control of the gap between valence and ...
Direct observation of minibands in a twisted graphene/WS 2 bilayer …
2020年4月3日 · We resolve these issues by using a new microfocused ARPES (microARPES) approach with a spatial resolution on the order of 1 μm to measure a heterobilayer consisting of graphene, SL WS 2, and hBN. Both the graphene and the SL WS 2 were grown by chemical vapor deposition (CVD) and sequentially transferred onto the hBN.
Observation of dichotomic field-tunable electronic structure in …
2024年5月3日 · Twisted bilayer graphene (tBLG) provides a fascinating platform for engineering flat bands and inducing correlated phenomena. By designing the stacking architecture of graphene layers,...
ARPES Signatures of Few-Layer Twistronic Graphenes
2023年5月26日 · The electronic structure of 3o-twisted bilayer graphene (TBG) is studied by angle-resolved photoelectron spectroscopy (ARPES). Sub-mm-sized TBG prepd. by direct bonding in a high vacuum enabled us to use conventional ARPES band …
Visualization of the flat electronic band in twisted bilayer graphene ...
2020年7月27日 · Bilayer graphene has been predicted to host a moiré miniband with flat dispersion if the layers are stacked at specific twist angles known as the ’magic angles’ 1,2.
[2304.01931] ARPES signatures of few-layer twistronic graphenes
2023年4月4日 · Here we use angle-resolved photoemission spectroscopy (ARPES) to study the twist-dependent ($1^\circ < \theta < 8^\circ$) electronic band structure of few-layer graphenes, including twisted bilayer, monolayer-on-bilayer, and double-bilayer graphene (tDBG).
Layer-Dependent Interaction Effects in the Electronic Structure of ...
2023年7月24日 · Here, we use gated ARPES to directly measure the layer-dependent electronic structure of an intermediate angle (3°) twisted bilayer graphene device as a function of electrostatic doping and displacement field.
Direct evidence for flat bands in twisted bilayer graphene from nano-ARPES
2020年2月6日 · Here, we combine different imaging techniques and angle resolved photoemission with simultaneous real and momentum space resolution (nano-ARPES) to directly map the band dispersion in twisted bilayer graphene devices near charge neutrality.