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Unconventional charge-density-wave gap in monolayer NbS
Timo Knispel, Jan Berges, Arne Schobert +5
Using scanning tunneling microscopy and spectroscopy, for a monolayer of transition metal dichalcogenide H-NbS grown by molecular beam epitaxy on graphene, we provide unambiguo…
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$_…
Quantum-dot-like states in molybdenum disulfide nanostructures due to the interplay of local surface wrinkling, strain, and dielectric confinement
Christian Carmesin, Michael Lorke, Matthias Florian +4
The observation of quantum light emission from atomically thin transition metal dichalcogenides has opened a new field of applications for these material systems. The corresponding…
Pseudodoping of Metallic Two-Dimensional Materials by The Supporting Substrates
Bin Shao, Andreas Eich, Charlotte Sanders +5
We demonstrate how hybridization between a two-dimensional material and its substrate can lead to an apparent heavy doping, using the example of monolayer TaS grown on Au(111).…
Excitation-induced transition to indirect band gaps in atomically thin transition metal dichalcogenide semiconductors
D. Erben, A. Steinhoff, G. Schönhoff +3
Monolayers of transition metal dichalcogenides (TMDCs) exhibit an exceptionally strong Coulomb interaction between charge carriers due to the two-dimensional carrier confinement in…
Optically and electrically controllable adatom spin-orbital dynamics in transition metal dichalcogenides
Bin Shao, Malte Schüler, Gunnar Schönhoff +3
We analyze the interplay of spin-valley coupling, orbital physics and magnetic anisotropy taking place at single magnetic atoms adsorbed on semiconducting transition-metal dichalco…
Pseudodoping of Metallic Two-Dimensional Materials
T. O. Wehling
We demonstrate how weak hybridization can lead to apparent heavy doping of 2d materials even in case of physisorptive binding. Combining ab-intio calculations and a generic model w…
Valley Plasmonics in the Dichalcogenides
R. E. Groenewald, M. Rösner, G. Schönhoff +2
The rich phenomenology of plasmonic excitations in the dichalcogenides is analyzed as a function of doping. The many-body polarization, the dielectric response function and electro…
Tuning the van der Waals Interaction of Graphene with Molecules via Doping
Felix Huttmann, Antonio J. Martínez-Galera, Vasile Caciuc +7
We use scanning tunneling microscopy to visualize and thermal desorption spectroscopy to quantitatively measure that the binding of naphthalene molecules to graphene (Gr), a case o…
Phonon-pump XUV-photoemission-probe in graphene: evidence for non-adiabatic heating of Dirac carriers by lattice deformation
Isabella Gierz, Matteo Mitrano, Hubertus Bromberger +11
We modulate the atomic structure of bilayer graphene by driving its lattice at resonance with the in-plane E1u lattice vibration at 6.3um. Using time- and angle-resolved photoemiss…
Europium Underneath Graphene on Ir(111): Intercalation Mechanism, Magnetism, and Band Structure
Stefan Schumacher, Felix Huttmann, Marin Petrović +15
The intercalation of Eu underneath Gr on Ir(111) is comprehensively investigated by microscopic, magnetic, and spectroscopic measurements, as well as by density functional theory.…
Electronic Structures and Optical Properties of Partially and Fully Fluorinated Graphene
Shengjun Yuan, Malte Rosner, Alexander Schulz +2
In this letter we study the electronic structures and optical properties of partially and fully fluorinated graphene by a combination of abinitio G0W0 calculations and large-scale…
Electronic Transport in Graphene with Aggregated Hydrogen Adatoms
Fernando Gargiulo, Gabriel Autès, Naunidh Virk +5
Hydrogen adatoms and other species covalently bound to graphene act as resonant scattering centers affecting the electronic transport properties and inducing Anderson localization.…
Probing of valley polarization in graphene via optical second-harmonic generation
T. O. Wehling, A. Huber, A. I. Lichtenstein +1
Valley polarization in graphene breaks inversion symmetry and therefore leads to second-harmonic generation. We present a complete theory of this effect within a single-particle ap…
Charge doping induced phase transitions in hydrogenated and fluorinated graphene
Tim Wehling, Bernhard Grundkötter-Stock, Bálint Aradi +2
We show that charge doping can induce transitions between three distinct adsorbate phases in hydrogenated and fluorinated graphene. By combining ab initio, approximate density func…
Ferromagnetic two-dimensional crystals: Single layers of K2CuF4
B. Sachs, T. O. Wehling, K. S. Novoselov +2
The successful isolation of graphene ten years ago has evoked a rapidly growing scientific interest in the nature of two-dimensional (2D) crystals. A number of different 2D crystal…
Graphene-based topological insulator with an intrinsic bulk band gap above room temperature
Liangzhi Kou, Binghai Yan, Feiming Hu +5
Topological insulators (TIs) represent a new quantum state of matter characterized by robust gapless states inside the insulating bulk gap. The metallic edge states of a two-dimens…
Proximity Enhanced Quantum Spin Hall State in Graphene
Liangzhi Kou, Feiming Hu, Binghai Yan +4
Graphene is the first model system of two-dimensional topological insulator (TI), also known as quantum spin Hall (QSH) insulator. The QSH effect in graphene, however, has eluded d…
Adatoms and clusters of 3d transition metals on graphene: Electronic and magnetic configurations
T. Eelbo, M. Waśniowska, P. Thakur +8
We investigate the electronic and magnetic properties of single Fe, Co, and Ni atoms and clusters on monolayer graphene (MLG) on SiC(0001) by means of scanning tunneling microscopy…
Doping Mechanisms in Graphene-MoS2 Hybrids
B. Sachs, L. Britnell, T. O. Wehling +6
We present a joint theoretical and experimental investigation of charge doping and electronic potential landscapes in hybrid structures composed of graphene and semiconducting sing…
Local Gating of an Ir(111) Surface Resonance by Graphene Islands
S. J. Altenburg, J. Kröger, T. O. Wehling +3
The influence of graphene islands on the electronic structure of the Ir(111) surface is investigated. Scanning tunneling spectroscopy (STS) indicates the presence of a two-dimensio…
Enhanced Screening in Chemically Functionalized Graphene
Shengjun Yuan, T. O. Wehling, A. I. Lichtenstein +1
Resonant scatterers such as hydrogen adatoms can strongly enhance the low energy density of states in graphene. Here, we study the impact of these impurities on the electronic scre…
In-plane magnetic anisotropy of Fe atoms on BiSe(111)
J. Honolka, A. A. Khajetoorians, V. Sessi +11
The robustness of the gapless topological surface state hosted by a 3D topological insulator against perturbations of magnetic origin has been the focus of recent investigations. W…
Multi-scale magnetic study on Ni(111) and graphene on Ni(111)
L. V. Dzemiantsova, M. Karolak, F. Lofink +9
We have investigated the magnetism of the bare and graphene-covered (111) surface of a Ni single crystal employing three different magnetic imaging techniques and ab initio calcula…