4.9k citations · 11.4k across the 18 of their papers we have counts for
18 papers
Van der Waals injection-molded crystals
Vinh Tran, Amy X. Wu, Laisi Chen +5
Shaping low-dimensional crystals into precise geometries with low disorder is an outstanding challenge. Here, we present a method to grow single crystals of arbitrary geometry with…
Manipulating moires by controlling heterostrain in van der Waals devices
Ian Sequeira, Andrew Z. Barabas, Aaron H Barajas-Aguilar +6
Van der Waals (vdW) moires offer tunable superlattices that can strongly manipulate electronic properties. We demonstrate the in-situ manipulation of moire superlattices via hetero…
Electrically-driven amplification of terahertz acoustic waves in graphene
Aaron H. Barajas-Aguilar, Jasen Zion, Ian Sequeira +6
In graphene devices, the electronic drift velocity can easily exceed the speed of sound in the material at moderate current biases. Under this condition, the electronic system can…
Controllable Strain-driven Topological Phase Transition and Dominant Surface State Transport in High-Quality HfTe5 Samples
Jinyu Liu, Yinong Zhou, Sebastian Yepez Rodriguez +11
Controlling materials to create and tune topological phases of matter could potentially be used to explore new phases of topological quantum matter and to create novel devices wher…
Mechanically-reconfigurable van der Waals devices via low-friction gold sliding
Andrew Z. Barabas, Ian Sequeira, Yuhui Yang +4
Interfaces of van der Waals (vdW) materials such as graphite and hexagonal boron nitride (hBN) exhibit low-friction sliding due to their atomically-flat surfaces and weak vdW bondi…
Correlated Insulator Behaviour at Half-Filling in Magic Angle Graphene Superlattices
Yuan Cao, Valla Fatemi, Ahmet Demir +9
Van der Waals (vdW) heterostructures are an emergent class of metamaterials comprised of vertically stacked two-dimensional (2D) building blocks, which provide us with a vast tool…
Mach-Zehnder interferometry using spin- and valley-polarized quantum Hall edge states in graphene
Di S. Wei, Toeno van der Sar, Javier D. Sanchez-Yamagishi +5
Confined to a two-dimensional plane, electrons in a strong magnetic field travel along the edge in one-dimensional quantum Hall channels that are protected against backscattering.…
Superlattice-induced insulating states and valley-protected orbits in twisted bilayer graphene
Y. Cao, J. Y. Luo, V. Fatemi +6
Twisted bilayer graphene (TwBLG) is one of the simplest van der Waals heterostructures, yet it yields a complex electronic system with intricate interplay between moiré physics and…
Observation of Helical Edge States and Fractional Quantum Hall Effect in a Graphene Electron-hole Bilayer
J. D. Sanchez-Yamagishi, J. Y. Luo, A. F. Young +5
A quantum Hall edge state provides a rich foundation to study electrons in 1-dimension (1d) but is limited to chiral propagation along a single direction. Here, we demonstrate a ve…
Tunneling in graphene-topological insulator hybrid devices
Hadar Steinberg, Lucas A. Orona, Valla Fatemi +4
Hybrid graphene-topological insulator (TI) devices were fabricated using a mechanical transfer method and studied via electronic transport. Devices consisting of bilayer graphene (…
Tunable symmetry breaking and helical edge transport in a graphene quantum spin Hall state
A. F. Young, J. D. Sanchez-Yamagishi, B. Hunt +5
Low-dimensional electronic systems have traditionally been obtained by electrostatically confining electrons, either in heterostructures or in intrinsically nanoscale materials suc…
Massive Dirac fermions and Hofstadter butterfly in a van der Waals heterostructure
B. Hunt, J. D. Sanchez-Yamagishi, A. F. Young +6
Van der Waals heterostructures comprise a new class of artificial materials formed by stacking atomically-thin planar crystals. Here, we demonstrate band structure engineering of a…
Chemical reactivity imprint lithography on graphene: Controlling the substrate influence on electron transfer reactions
Qing Hua Wang, Zhong Jin, Ki Kang Kim +10
The chemical functionalization of graphene enables control over electronic properties and sensor recognition sites. However, its study is confounded by an unusually strong influenc…
Emergence of Superlattice Dirac Points in Graphene on Hexagonal Boron Nitride
Matthew Yankowitz, Jiamin Xue, Daniel Cormode +6
The Schrödinger equation dictates that the propagation of nearly free electrons through a weak periodic potential results in the opening of band gaps near points of the reciprocal…
Long wavelength local density of states oscillations near graphene step edges
Jiamin Xue, Javier Sanchez-Yamagishi, K. Watanabe +3
Using scanning tunneling microscopy and spectroscopy, we have studied the local density of states (LDOS) of graphene over step edges in boron nitride. Long wavelength oscillations…
Quantum Hall Effect, Screening and Layer-Polarized Insulating States in Twisted Bilayer Graphene
Javier D. Sanchez-Yamagishi, Thiti Taychatanapat, Kenji Watanabe +3
We investigate electronic transport in dual-gated twisted bilayer graphene. Despite the sub-nanometer proximity between the layers, we identify independent contributions to the mag…
STM Spectroscopy of ultra-flat graphene on hexagonal boron nitride
Jiamin Xue, Javier Sanchez-Yamagishi, D. Bulmash +6
Graphene has demonstrated great promise for future electronics technology as well as fundamental physics applications because of its linear energy-momentum dispersion relations whi…
Anisotropic Etching and Nanoribbon Formation in Single-Layer Graphene
Leonardo C. Campos, Vitor R. Manfrinato, Javier D. Sanchez-Yamagishi +2
We demonstrate anisotropic etching of single-layer graphene by thermally-activated nickel nanoparticles. Using this technique, we obtain sub-10nm nanoribbons and other graphene nan…