Publications (35)
Coexistence of charge and ferromagnetic order in fcc Fe
Pin-Jui Hsu, Jens Kuegel, Jeannette Kemmer +5
Phase coexistence phenomena have been intensively studied in strongly correlated materials where several ordered states simultaneously occur or compete. Material properties critica…
Anisotropic Ballistic Transport Revealed by Molecular Nanoprobe Experiments
Markus Leisegang, Robert Schindhelm, Jens Kügel +1
Atomic-scale charge transport properties are not only of significant fundamental interest but also highly relevant for numerous technical applications. However, experimental method…
Probing chiral symmetry with a topological domain wall sensor
Glenn Wagner, Titus Neupert, Ronny Thomale +5
Chiral symmetry is a fundamental property with profound implications for the properties of elementary particles, that implies a spectral symmetry (i.e. E => -E ) in their dispersio…
Ultrathin BaTiO3 templates for multiferroic nanostructures
Xumin Chen, Seolun Yang, Ji-Hyun Kim +11
Structural, electronic and dielectric properties of high-quality ultrathin BaTiO3 films are investigated. The films, which are grown by ozone-assisted molecular beam epitaxy on Nb-…
Spin-resolved spectroscopic evidence for spinarons in Co adatoms
Felix Friedrich, Artem Odobesko, Juba Bouaziz +2
Single cobalt atoms on the (111) surfaces of noble metals were for a long time considered prototypical systems for the Kondo effect in scanning tunneling microscopy experiments. Ye…
Sizable superconducting gap and anisotropic chiral topological superconductivity in the Weyl semimetal PtBi
Xiaochun Huang, Lingxiao Zhao, Sebastian Schimmel +5
Topological superconductors offer a fertile ground for realizing Majorana zero modes -- topologically protected, zero-energy quasiparticles that are resilient to local perturbation…
Probing spin-dependent charge transport at single-nanometer length scales
Patrick Härtl, Markus Leisegang, Jens Kügel +1
The coherent transport of charge and spin is one key requirement of future devices for quantum computing and communication. Scattering at defects or impurities may seriously reduce…
Dual nature of magnetic dopants and competing trends in topological insulators
Paolo Sessi, Rudro Biswas, Thomas Bathon +8
Topological insulators interacting with magnetic impurities have been reported to host several unconventional effects. These phenomena are described within the framework of gapping…
Indirect Chiral Magnetic Exchange through Dzyaloshinskii-Moriya--Enhanced RKKY Interactions in Manganese Oxide Chains on Ir(100)
Martin Schmitt, Paolo Moras, Gustav Bihlmayer +9
Ruderman-Kittel-Kasuya-Yosida interaction even if their wave functions lack direct overlap. Theory predicts that spin-orbit scattering leads to a Dzyaloshinskii-Moriya type enhance…
Probing the Electronic Properties of Individual MnPc Molecules Coupled to Topological States
Paolo Sessi, Thomas Bathon, Konstantin K. Kokh +2
Hybrid organic/inorganic interfaces have been widely reported to host emergent properties that go beyond those of their single constituents. Coupling molecules to the recently disc…
Single electron gating of topological insulators
Paolo Sessi, Thomas Bathon, Konstantin A. Kokh +2
Introducing, observing, and manipulating individual impurities coupled to a host material offers the opportunity to create new device concepts based on single spin and charge state…
Facet-selective ballistic supercurrent in a weak topological insulator
Prasanna Rout, Ankit Khola, Lalit Pandey +9
Topological superconductivity is widely pursued by inducing superconducting correlations in topologically protected boundary states. In two dimensions, this strategy has been reali…
Coupling of Yu-Shiba-Rusinov states in 1D chains of Fe atoms on Nb(110)
Felix Friedrich, Robin Boshuis, Matthias Bode +1
The hybridization of Yu-Shiba-Rusinov states in dimers of magnetic impurities leads to molecular-like bonding and antibonding modes. In many-impurity systems, the interaction gives…
Reversible magnetic switching of high-spin molecules on a giant Rashba surface
Jens Kügel, Michael Karolak, Andreas Krönlein +3
The quantum mechanical screening of a spin via conduction electrons depends sensitively on the environment seen by the magnetic impurity. A high degree of responsiveness can be obt…
Boosting the STM's spatial and energy resolution with double-functionalized probe tips
Artem Odobesko, Raffael L. Klees, Felix Friedrich +2
Scattering of superconducting pairs by magnetic impurities on a superconducting surface leads to pairs of sharp in-gap resonances, known as Yu-Shiba-Rusinov (YSR) bound states. Sim…
Hysteretic melting transition of a soliton lattice in a commensurate charge modulation
Pin-Jui Hsu, Tobias Mauerer, Matthias Vogt +5
We report on the observation of the hysteretic transition of a commensurate charge modulation in IrTe from transport and scanning tunneling microscopy (STM) studies. Below the…
Reversible Tuning of Collinear versus Chiral Magnetic Order by Chemical Stimulus
Jing Qi, Paula M. Weber, Tilman KiÃlinger +3
The Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction mediates collinear magnetic interactions via the conduction electrons of a non-magnetic spacer, resulting in a ferro- or antife…
Magnetic domain structure of epitaxial Gd films grown on W(110)
Patrick Härtl, Markus Leisegang, Matthias Bode
We present a detailed real-space spin-polarized scanning tunneling microscopy (SP-STM) study of the magnetic domain structure of Gd(0001) films epitaxially grown on W(110). To find…
Monolayer and bilayer pentacene on Cu(111)
Joseph Smerdon, Matthias Bode, Nathan Guisinger +1
The morphology and electronic structure of pentacene (Pn) deposited on Cu(111) was studied using scanning tunneling microscopy (STM) and spectroscopy (STS). Deposition of a multila…
Robust spin-polarized midgap states at step edges of topological crystalline insulators
Paolo Sessi, Domenico Di Sante, Andrzej Szczerbakow +11
Topological crystalline insulators are materials in which the crystalline symmetry leads to topologically protected surface states with a chiral spin texture, rendering them potent…
Observation of zero-energy modes in Gd atomic chains on superconducting Nb(110)
Yu Wang, Felix Friedrich, Matthias Bode +1
In this experimental study, we use scanning tunneling microscopy and spectroscopy to investigate Yu-Shiba-Rusinov states induced by 4f-shell rare-earth Gd adatoms on a superconduct…
Breaking crystalline symmetry of epitaxial SnTe films by strain
Steffen Schreyeck, Karl Brunner, Laurens W. Molenkamp +7
SnTe belongs to the recently discovered class of topological crystalline insulators. Here we study the formation of line defects which break crystalline symmetry by strain in thin…
Impurity screening and stability of Fermi arcs against Coulomband magnetic scattering in a Weyl monopnictide
Paolo Sessi, Yan Sun, Thomas Bathon +9
We present a quasiparticle interference study of clean and Mn surface-doped TaAs, a prototypical Weyl semimetal, to test the screening properties as well as the stability of Fermi…
Rare-earth atoms on Nb(110) as a platform to engineer topological superconductivity
David Antognini Silva, Yu Wang, Nicolae Atodiresei +5
Helical spin textures in one-dimensional magnetic chains on superconductors can enable topological superconductivity and host Majorana zero modes, independent of the presence of in…
Experimental Realization of the Topologically Nontrivial Phase in Monolayer SiTe
Xiaochun Huang, Lingxiao Zhao, Rui Xiong +4
The free-standing monolayer SiTe (ML-SiTe) has been theoretically predicted to host a room-temperature quantum spin Hall phase. However, its experimental realizatio…
Anisotropic vortices on superconducting Nb(110)
Artem Odobesko, Felix Friedrich, Song-Bo Zhang +4
We investigate the electronic properties of type-II superconducting Nb(110) in an external magnetic field. Scanning tunneling spectroscopy reveals a complex vortex shape which deve…
On the preparation and electronic properties of clean superconducting Nb(110) surfaces
Artem B. Odobesko, Soumyajyoti Haldar, Stefan Wilfert +7
We have studied cleaning procedures of Nb(110) by verifying the surface quality with low-energy electron diffraction, Auger electron spectroscopy, and scanning tunneling microscopy…
Nanometer-scale striped surface terminations on fractured SrTiO surfaces
Nathan P. Guisinger, Tiffany S. Santos, Jeffrey R. Guest +4
Using cross-sectional scanning tunneling microscopy on in situ fractured SrTiO, one of the most commonly used substrates for the growth of complex oxide thin films and superl…
Signatures of Dirac fermion-mediated magnetic order
Paolo Sessi, Felix Reis, Thomas Bathon +3
The spin-momentum locking of topological states offers an ideal platform to explore novel magneto-electric effects. These intimately depend on the ability to manipulate the spin te…
Scanning tunneling spectroscopy investigations of superconducting-doped topological insulators: Experimental pitfalls and results
Stefan Wilfert, Paolo Sessi, Zhiwei Wang +8
Recently the doping of topological insulators has attracted significant interest as a potential route towards topological superconductivity. Because many experimental techniques la…
Mapping the effect of defect-induced strain disorder on the Dirac states of topological insulators
Oliver Storz, Alberto Cortijo, Stefan Wilfert +6
We provide a detailed microscopic characterization of the influence of defects-induced disorder onto the Dirac spectrum of three dimensional topological insulators. By spatially re…
Termination-dependent surface properties in the giant-Rashba semiconductors BiTeX (X = Cl, Br, I)
Sebastian Fiedler, Thomas Bathon, Sergey V. Eremeev +7
The non-centrosymmetric semiconductors BiTeX (X = Cl, Br, I) show large Rashba-type spin-orbit splittings in their electronic structure making them candidate materials for spin-bas…
Systematics of molecular self-assembled networks at topological insulators surfaces
Thomas Bathon, Paolo Sessi, Konstantin Kokh +2
The success of topological insulators (TI) in creating devices with unique functionalities is directly connected to the ability of coupling their helical spin states to well define…
Evidence for a conical spin spiral state in the Mn triple-layer on W(001): spin-polarized scanning tunneling microscopy and first-principles calculations
Paula M. Weber, Tim Drevelow, Jing Qi +2
The spin structure of a Mn triple layer grown pseudomorphically on surfaces is studied using spin-polarized scanning tunneling microscopy (SP-STM) and density functional theory (DF…
Interaction effects in a 1D flat band at a topological crystalline step edge
Glenn Wagner, Souvik Das, Johannes Jung +11
Step edges of topological crystalline insulators can be viewed as predecessors of higher-order topology, as they embody one-dimensional edge channels embedded in an effective three…