162 citations · 593 across the 17 of their papers we have counts for
17 papers
Imaging Quantum Interference in Stadium-Shaped Monolayer and Bilayer Graphene Quantum Dots
Zhehao Ge, Dillon Wong, Juwon Lee +10
Experimental realization of graphene-based stadium-shaped quantum dots (QDs) have been few and incompatible with scanned probe microscopy. Yet, direct visualization of electronic s…
Denoising Scanning Tunneling Microscopy Images of Graphene with Supervised Machine Learning
Frédéric Joucken, John L. Davenport, Zhehao Ge +6
Machine learning (ML) methods are extraordinarily successful at denoising photographic images. The application of such denoising methods to scientific images is, however, often com…
Quasiparticle interference patterns in bilayer graphene with trigonal warping
Vardan Kaladzhyan, Frédéric Joucken, Zhehao Ge +5
We calculate the form of quasiparticle interference patterns in bilayer graphene within a low-energy description, taking into account perturbatively the trigonal warping terms. We…
Surface states and quasiparticle interference in Bernal and rhombohedral graphite with and without trigonal warping
Vardan Kaladzhyan, Sarah Pinon, Frédéric Joucken +6
We use an exact analytical technique [Phys. Rev. B \textbf{101}, 115405 (2020), Phys. Rev. B \textbf{102}, 165117 (2020)] to recover the surface Green's functions for Bernal (ABA)…
Sublattice dependence and gate-tunability of midgap and resonant states induced by native dopants in Bernal-stacked bilayer graphene
Frédéric Joucken, Cristina Bena, Zhehao Ge +5
The properties of semiconductors can be crucially impacted by midgap states induced by dopants, which can be native or intentionally incorporated in the crystal lattice. For Bernal…
Direct Visualization of Native Defects in Graphite and Their Effect on the Electronic Properties of Bernal-Stacked Bilayer Graphene
Frederic Joucken, Cristina Bena, Zhehao Ge +7
Graphite crystals used to prepare graphene-based heterostructures are generally assumed to be defect free. We report here scanning tunneling microscopy results that show graphite c…
Control of Giant Topological Magnetic Moment and Valley Splitting in Trilayer Graphene
Zhehao Ge, Sergey Slizovskiy, Fredric Joucken +5
Bloch states of electrons in honeycomb two-dimensional crystals with multi-valley band structure and broken inversion symmetry have orbital magnetic moments of a topological nature…
Visualization and Manipulation of Bilayer Graphene Quantum Dots with Broken Rotational Symmetry and Nontrivial Topology
Zhehao Ge, Frederic Joucken, Eberth Quezada +8
Electrostatically defined quantum dots (QDs) in Bernal stacked bilayer graphene (BLG) are a promising quantum information platform because of their long spin decoherence times, hig…
Determination of the trigonal warping orientation in Bernal-stacked bilayer graphene via scanning tunneling microscopy
Frédéric Joucken, Zhehao Ge, Eberth A. Quezada-López +4
The existence of strong trigonal warping around the K point for the low energy electronic states in multilayer (N2) graphene films and graphite is well established. It is res…
Nanospot Angle-Resolved Photoemission Study of Bernal-Stacked Bilayer Graphene on Hexagonal Boron Nitride: Band Structure and Local Variation of Lattice Alignment
Frédéric Joucken, Eberth A. Quezada-López, Jose Avila +7
Hexagonal boron nitride (hBN) is the supporting substrate of choice for two-dimensional material devices because it is atomically flat and chemically inert. However, due to the sma…
Visualizing the Effect of an Electrostatic Gate with Angle-Resolved Photoemission Spectroscopy
Frédéric Joucken, Jose Avila, Zhehao Ge +9
Electrostatic gating is pervasive in materials science, yet its effects on the electronic band structure of materials has never been revealed directly by angle-resolved photoemissi…
A setup for extreme-ultraviolet ultrafast angle-resolved photoelectron spectroscopy at 50-kHz repetition rate
Jan Heye Buss, He Wang, Yiming Xu +11
Time- and angle-resolved photoelectron spectroscopy (trARPES) is a powerful method to track the ultrafast dynamics of quasiparticles and electronic bands in energy and momentum spa…
Oxidation-assisted graphene heteroepitaxy on copper foil
Nicolas Reckinger, Xiaohui Tang, Frédéric Joucken +6
We propose an innovative, easy-to-implement approach to synthesize large-area singlecrystalline graphene sheets by chemical vapor deposition on copper foil. This method doubly take…
Grain Boundaries in Graphene on SiC(000) Substrate
Yann Tison, Jérôme Lagoute, Vincent Repain +7
Grain boundaries in epitaxial graphene on the SiC(000) substrate are studied using scanning tunneling microscopy and spectroscopy. All investigated small-angle grain bound…
Fourier Transform Analysis of STM Images of Multilayer Graphene Moiré Patterns
Frédéric Joucken, Fernande Frising, Robert Sporken
With the help of a simple model, we analyze Scanning Tunneling Microscopy images of simple and double moiré patterns resulting from misoriented bi- and tri-layers graphene stacks.…
Direct growth of graphitic carbon on Si(111)
Pham Thanh Trung, Frederic Joucken, Jessica Campos-Delgado +3
Appropriate conditions for direct growth of graphitic films on Si(111) 77 are investigated. The structural and electronic properties of the samples are studied by Auger Ele…
Localized state and charge transfer in nitrogen-doped graphene
Frederic Joucken, Yann Tison, Jerome Lagoute +11
Nitrogen-doped epitaxial graphene grown on SiC(000?1) was prepared by exposing the surface to an atomic nitrogen flux. Using Scanning Tunneling Microscopy (STM) and Spectroscopy (S…