40 citations · 204 across the 20 of their papers we have counts for
21 papers
Emergence of a non-bulk hexagonal FeS single layer via phase transformation
Affan Safeer, Wejdan Beida, Felix Oberbauer +8
Two-dimensional materials can stabilize crystal structures that are absent from their bulk counterparts, offering opportunities for materials design. Here, we report the synthesis…
Atomic-Scale Detection of Néel Vector Switching in the Single-Layer A-type Antiferromagnet Cr2S3-2D
Affan Safeer, Calisa Dias, Mahdi Ghorbani-Asl +9
The detection of Néel vector switching in a single-layer A-type antiferromagnet marks an important step toward functional two-dimensional spintronics. Here, CrS-2D, grown o…
Atomic-Scale Quantum Control of Single Spin Defects in a Two-Dimensional Semiconductor
Kwan Ho Au-Yeung, Wantong Huang, Johanna Matusche +15
Individual spin defects in solids are promising building blocks for quantum technologies, but their deterministic creation, individual addressability, and operation near surfaces r…
Substrate Role in Polaron Formation on Single-layer Transition Metal Dihalides
Affan Safeer, Oktay Güleryüz, Guangyao Miao +3
Single-layer transition metal dihalides grown on conducting substrates were shown to host stable polarons. Here, we investigate polarons in insulating single-layer MnBr grown b…
MnBr on the graphene on Ir(110) substrate: growth, structure, and super-moirè
Affan Safeer, Oktay Güleryüz, Nicolae Atodiresei +3
Single-layer MnBr is grown on graphene (Gr) supported by Ir(110) and investigated using low-energy electron diffraction, scanning tunneling microscopy, and spectroscopy. The st…
Hydrogen toggling between Yoshimori spin spirals and elliptical Dzyaloshinskii-Moriya skyrmions in Fe on Ir(110)
Timo Knispel, Vasily Tseplyaev, Gustav Bihlmayer +3
Skyrmions are particle-like spin textures that arise from spin spiral states in the presence of an external magnetic field. These spirals can originate from either frustrated Heise…
Inelastic tunneling into multipolaronic bound states in single-layer MoS
Camiel van Efferen, Laura Pätzold, Tfyeche Y. Tounsi +12
Polarons are quasiparticles that arise from the interaction of electrons or holes with lattice vibrations. Though polarons are well-studied across multiple disciplines, experimenta…
Which chromium-sulfur compounds exist as 2D material?
Affan Safeer, Mahdi Ghorbani-Asl, Wouter Jolie +3
Two-dimensional (2D) chromium-sulfides are synthesized by molecular beam epitaxy using graphene as a substrate. Structure characterization by employing scanning tunneling microscop…
Atomic-scale Dzyaloshinskii-Moriya-modified Yoshimori spirals in Fe double layer on Ir(110)
Timo Knispel, Vasily Tseplyaev, Gustav Bihlmayer +3
Ultrathin magnetic films on heavy metal substrates with strong spin-orbit coupling provide versatile platforms for exploring novel spin textures. So far, structurally open fcc(110)…
Engineering two-dimensional materials from single-layer NbS
Timo Knispel, Daniela Mohrenstecher, Carsten Speckmann +10
Starting from a single layer of NbS grown on graphene by molecular beam epitaxy, the single unit cell thick 2D materials NbS-2D and NbS-2D are created using…
Probing the spin polarization of an Anderson impurity
Mahasweta Bagchi, Tfyeche Y. Tounsi, Affan Safeer +6
We report spin-polarized scanning tunneling microscopy measurements of an Anderson impurity system in MoS mirror twin boundaries, where both the quantum confined impurity sta…
Tip-induced creation and Jahn-Teller distortions of sulfur vacancies in single-layer MoS
Daniel Jansen, Tfyeche Tounsi, Jeison Fischer +4
We present an atomically precise technique to create sulfur vacancies and control their atomic configurations in single-layer MoS. It involves adsorbed Fe atoms and the tip o…
Growth of aligned and twisted hexagonal boron nitride on Ir(110)
Thomas Michely, Jason Bergelt, Affan Safeer +3
The growth of monolayer hexagonal boron nitride (h-BN) on Ir(110) through low-pressure chemical vapor deposition is investigated using low energy electron diffraction and scanning…
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…
Novel 2D vanadium sulphides: synthesis, atomic structure engineering and charge density waves
Camiel van Efferen, Joshua Hall, Nicolae Atodiresei +9
Two new ultimately thin vanadium rich 2D materials based on VS2 are created via molecular beam epitaxy and investigated using scanning tunneling microscopy, X-ray photoemission spe…
Modulated Kondo screening along magnetic mirror twin boundaries in monolayer MoS2 on graphene
Camiel van Efferen, Jeison Fischer, Theo A. Costi +3
A many-body resonance emerges at the Fermi energy when an electron bath screens the magnetic moment of a half-filled impurity level. This Kondo effect, originally introduced to exp…
Metal-insulator transition in monolayer MoS via contactless chemical doping
Camiel van Efferen, Clifford Murray, Jeison Fischer +4
Much effort has been made to modify the properties of transition metal dichalcogenide layers via their environment as a route to new functionalization. However, it remains a challe…
Single-crystal graphene on Ir(110)
Stefan Kraus, Felix Huttmann, Jeison Fischer +12
A single-crystal sheet of graphene is synthesized on the low-symmetry substrate Ir(110) by thermal decomposition of CH at 1500 K. Using scanning tunneling microscopy, low-e…
Band Bending and Valence Band Quantization at Line Defects in MoS
Clifford Murray, Camiel van Efferen, Wouter Jolie +6
The variation of the electronic structure normal to 1D defects in quasi-freestanding MoS, grown by molecular beam epitaxy, is investigated through high resolution scanning tunn…
Comprehensive tunneling spectroscopy of quasi-freestanding MoS on graphene on Ir(111)
Clifford Murray, Wouter Jolie, Jeison A. Fischer +6
We apply scanning tunneling spectroscopy to determine the bandgaps of mono-, bi- and trilayer MoS grown on a graphene single crystal on Ir(111). Besides the typical scanning tu…
Superparamagnetic response of Fe-coated W tips in spin-polarized scanning tunneling microscopy
Soo-hyon Phark, Jeison A. Fischer, Marco Corbetta +2
We performed spin-polarized scanning tunneling spectroscopy on biatomic-layer-high Co nanoislands grown on Cu(111) in magnetic fields oriented normal to the sample surface, with Fe…