878 citations · 2.3k across the 20 of their papers we have counts for
21 papers
Ultra-clean assembly of van der Waals heterostructures
Wendong Wang, Nicholas Clark, Matthew Hamer +24
Layer-by-layer assembly of van der Waals (vdW) heterostructures underpins new discoveries in solid state physics, material science and chemistry. Despite the successes, all current…
Thermopower in hBN/graphene/hBN superlattices
Victor H. Guarochico-Moreira, Christopher R. Anderson, Vladimir Fal'ko +9
Thermoelectric effects are highly sensitive to the asymmetry in the density of states around the Fermi energy and can be exploited as probes of the electronic structure. We experim…
Mapping quantum Hall edge states in graphene by scanning tunneling microscopy
T. Johnsen, C. Schattauer, S. Samaddar +7
Quantum Hall edge states are the paradigmatic example of the bulk-boundary correspondence. They are prone to intricate reconstructions calling for their detailed investigation at h…
Interfacial ferroelectricity in marginally twisted 2D semiconductors
Astrid Weston, Eli G Castanon, Vladimir Enaldiev +19
Twisted heterostructures of two-dimensional crystals offer almost unlimited scope for the design of novel metamaterials. Here we demonstrate a room-temperature ferroelectric semico…
Moiré superlattice effects and band structure evolution in near-30-degree twisted bilayer graphene
Matthew J. Hamer, Alessio Giampietri, Viktor Kandyba +6
In stacks of two-dimensional crystals, mismatch of their lattice constants and misalignment of crystallographic axes lead to formation of moiré patterns. We show that moiré superla…
Atomic Resolution Imaging of CrBr using Adhesion-Enhanced Grids
Matthew J. Hamer, David G. Hopkinson, Nick Clark +7
Suspended specimens of 2D crystals and their heterostructures are required for a range of studies including transmission electron microscopy (TEM), optical transmission experiments…
Ghost anti-crossings caused by interlayer umklapp hybridization of bands in 2D heterostructures
Abigail J. Graham, Johanna Zultak, Matthew J. Hamer +13
In two-dimensional heterostructures, crystalline atomic layers with differing lattice parameters can stack directly one on another. The resultant close proximity of atomic lattices…
Raman spectroscopy of GaSe and InSe post-transition metal chalcogenides layers
Maciej R. Molas, Anastasia V. Tyurnina, Viktor Zólyomi +9
III-VI post-transition metal chalcogenides (InSe and GaSe) are a new class of layered semiconductors, which feature a strong variation of size and type of their band gaps as a func…
Strongly Absorbing Nanoscale Infrared Domains within Graphene Bubbles
Tom Vincent, Matthew Hamer, Irina Grigorieva +3
Graphene has shown great potential for modulating infrared (IR) light in devices as small as 350 nm. At these length scales, nanoscale features of devices, and their interaction wi…
Enhanced superconductivity in few-layer TaS due to healing by oxygenation
J. Bekaert, E. Khestanova, D. G. Hopkinson +15
When approaching the atomically thin limit, defects and disorder play an increasingly important role in the properties of two-dimensional materials. Superconductivity is generally…
Control of electron-electron interaction in graphene by proximity screening
M. Kim, S. G. Xu, A. I. Berdyugin +14
Electron-electron interactions play a critical role in many condensed matter phenomena, and it is tempting to find a way to control them by changing the interactions' strength. One…
Ultra-thin van der Waals crystals as semiconductor quantum wells
Johanna Zultak, Samuel Magorrian, Maciej Koperski +11
Control over the electronic spectrum at low energy is at the heart of the functioning of modern advanced electronics: high electron mobility transistors, semiconductor and Capasso…
Resonantly hybridised excitons in moiré superlattices in van der Waals heterostructures
Evgeny M. Alexeev, David A. Ruiz-Tijerina, Mark Danovich +16
Atomically-thin layers of two-dimensional materials can be assembled in vertical stacks held together by relatively weak van der Waals forces, allowing for coupling between monolay…
Niobium diselenide superconducting photodetectors
Gavin J. Orchin, Domenico De Fazio, Angelo Di Bernardo +10
We report the photoresponse of niobium diselenide (NbSe), a transition metal dichalcogenide (TMD) which exhibits superconducting properties down to a single layer. Devices are…
Indirect to direct gap crossover in two-dimensional InSe revealed by ARPES
Matthew Hamer, Johanna Zultak, Anastasia V. Tyurnina +16
Atomically thin films of III-VI post-transition metal chalcogenides (InSe and GaSe) form an interesting class of two-dimensional semiconductor that feature strong variations of the…
Infrared-to-violet tunable optical activity in atomic films of GaSe, InSe, and their heterostructures
Daniel J. Terry, Viktor Zólyomi, Matthew Hamer +11
Two-dimensional semiconductors - atomic layers of materials with covalent intra-layer bonding and weak (van der Waals or quadrupole) coupling between the layers - are a new class o…
High quality factor graphene-based 2D heterostructure mechanical resonator
M. Will, M. Hamer, M. Müller +6
Ultralight mechanical resonators based on low-dimensional materials are well suited as exceptional transducers of minuscule forces or mass changes. However, the low dimensionality…
Optical second harmonic generation in encapsulated single-layer InSe
Nadine Leisgang, Jonas G. Roch, Guillaume Froehlicher +4
We report the observation of optical second harmonic generation (SHG) in single-layer indium selenide (InSe). We measure a second harmonic signal of under…
Gate-Defined Quantum Confinement in InSe-based van der Waals Heterostructures
Matthew Hamer, Endre Tóvári, Mengjian Zhu +13
Indium selenide, a post-transition metal chalcogenide, is a novel two-dimensional (2D) semiconductor with interesting electronic properties. Its tunable band gap and high electron…
Nanometer Resolution Elemental Mapping in Graphene-based TEM Liquid Cells
Daniel J. Kelly, Mingwei Zhou, Nick Clark +5
We demonstrate a new design of graphene liquid cell consisting of a thin lithographically patterned hexagonal boron nitride crystal encapsulated from both sides with graphene windo…
Observing imperfection in atomic interfaces for van der Waals heterostructures
Aidan. P. Rooney, Aleksey Kozikov, Alexander N. Rudenko +8
Vertically stacked van der Waals heterostructures are a lucrative platform for exploring the rich electronic and optoelectronic phenomena in two-dimensional materials. Their perfor…