Explanipedia

Thermal boundary conductance under large temperature discontinuities of ultrathin Pb(111) films on Si(111) Open

C. Brand, T. Witte, Mohammad Tajik, Jonas D. Fortmann, B. Finke , et al. · 2025

Heat transfer is a critical aspect of modern electronics, and a deeper understanding of the underlying physics is essential for building faster, smaller, and more powerful devices with improved performance and efficiency. In such nanoscale…

Atomic wires on substrates: Physics between one and two dimensions Open

H. Pfnür, Christoph Tegenkamp, Simone Sanna, Eric Jeckelmann, M. Horn‐von Hoegen , et al. · 2024

Wires having a width of one or two atoms are the smallest possible physical objects that may exhibit one-dimensional properties. In order to be experimentally accessible at finite temperatures, such wires must stabilized by interactions in…

Interparticle Distance Variation in Semiconductor Nanoplatelet Stacks (Adv. Funct. Mater. 24/2022) Open

Rebecca T. Graf, Anja Schlosser, Dániel Zámbó, Jakob Schlenkrich, Pascal Rusch , et al. · 2022

Semiconductor Nanoplatelet Stacks In article number 2112621, Nadja C. Bigall and co-workers demonstrate a route to decrease the inter-nanoplatelet distance in polymer encapsulated cadmium chalcogenide nanoplatelet stacks. Thus, certain lig…

Interparticle Distance Variation in Semiconductor Nanoplatelet Stacks Open

Rebecca T. Graf, Anja Schlosser, Dániel Zámbó, Jakob Schlenkrich, Pascal Rusch , et al. · 2022

In the large field of research on nanoplatelets (NPLs), their strong tendency to self‐assemble into ordered stacks and the resulting changes in their properties are of great interest. The assembly reveals new characteristics such as the ch…

Tungsten Nanoparticles Accelerate Polysulfides Conversion: A Viable Route toward Stable Room‐Temperature Sodium–Sulfur Batteries Open

Yuping Liu, Shuangying Ma, Marina Rosebrock, Pascal Rusch, Yvo Barnscheidt , et al. · 2022

Room‐temperature sodium–sulfur (RT Na–S) batteries are arousing great interest in recent years. Their practical applications, however, are hindered by several intrinsic problems, such as the sluggish kinetic, shuttle effect, and the incomp…

Monodisperse Molybdenum Nanoparticles as Highly Efficient Electrocatalysts for Li-S Batteries Open

Yuping Liu, Atasi Chatterjee, Pascal Rusch, Chuanqiang Wu, Pengfei Nan , et al. · 2021

Lithium-sulfur (Li-S) batteries have attracted widespread attention due to their high theoretical energy density. However, their practical application is still hindered by the shuttle effect and the sluggish conversion of lithium polysulfi…

Plasmon localization by adatoms in gold atomic wires on Si(775) Open

Zamin Mamiyev, Christoph Tegenkamp, H. Pfnür · 2021

Self-organized gold chains on vicinal Si(111) surfaces represent prototype examples of quasi-one-dimensional objects that are stabilized by hybridization with Si surface states. Their plasmons contain important information about the unoccu…

Enforced Long-Range Order in 1D Wires by Coupling to Higher Dimensions Open

Zamin Mamiyev, Christa Fink, Kris Holtgrewe, H. Pfnür, Simone Sanna · 2021

One-dimensional wires are known to be inherently unstable at finite temperature. Here, we show thatlong-range order of atomic Au double chains adsorbed on a Si(553) surface is not only stabilized byinteraction with the substrate, but spont…

Nitrogen Doping Improves the Immobilization and Catalytic Effects of Co9S8 in Li‐S Batteries Open

Yuping Liu, Shuangying Ma, Lifeng Liu, Julian Koch, Marina Rosebrock , et al. · 2020

Several critical issues, such as the shuttling effect and the sluggish reaction kinetics, exist in the design of high‐performance lithium–sulfur (Li‐S) batteries. Here, it is reported that nitrogen doping can simultaneously and significant…

Electromigration-induced directional steps towards the formation of single atomic Ag contacts Open

Atasi Chatterjee, Christoph Tegenkamp, H. Pfnür · 2020

Even though there have been many experimental attempts and theoretical approaches to understand the process of electromigration (EM), it has not been quantitatively understood for ultrathin structures and at grain boundaries. Nevertheless,…

Semiconductor Nanoparticles: A Versatile Route to Assemble Semiconductor Nanoparticles into Functional Aerogels by Means of Trivalent Cations (Small 16/2020) Open

Dániel Zámbó, Anja Schlosser, Pascal Rusch, Franziska Lübkemann, Julian Koch , et al. · 2020

In article number 1906934, Nadja C. Bigall and co-workers report a non-oxidative and versatile route to assemble semiconductor dot-in-rods and core/crown nanoplatelets into hyperbranched, voluminous and fluorescent gel structures by using …

A Versatile Route to Assemble Semiconductor Nanoparticles into Functional Aerogels by Means of Trivalent Cations Open

Dániel Zámbó, Anja Schlosser, Pascal Rusch, Franziska Lübkemann, Julian Koch , et al. · 2020

3D nanoparticle assemblies offer a unique platform to enhance and extend the functionality and optical/electrical properties of individual nanoparticles. Especially, a self‐supported, voluminous, and porous macroscopic material built up fr…

Electromigration-induced directional steps towards formation of single atomic Ag contacts. Open

Atasi Chatterjee, Christoph Tegenkamp, H. Pfnür · 2019

Background:The process of electromigration is still not quantitatively understood. We showed recently that it can be used reliably for formation of single atomic point contacts in pre-structured Ag nanostructures. Results:The process of fo…

Formation of Sn‐Induced Nanowires on Si(557) (Phys. Status Solidi B 10/2019) Open

Monika Jäger, H. Pfnür, Mauro Fanciulli, A. P. Weber, J. Hugo Dil , et al. · 2019

The growth of Sn on Si(557) has been studied by M. Jäger et al. (article no. 1900152) in order to elucidate the possibility to form defined nanowires. For low Sn-coverage, the surface structure consists of ca. 3 nm wide (111) terraces cove…

Formation of Sn‐Induced Nanowires on Si(557) Open

Monika Jäger, H. Pfnür, Mauro Fanciulli, A. P. Weber, J. Hugo Dil , et al. · 2019

In this study, the growth of Sn on Si(557) surfaces by means of scanning tunneling microscopy, low energy electron diffraction and angle resolved photoemission is analyzed. Depending on the Sn submonolayer coverage, various Sn‐nanowires ar…

Plasmon Standing Waves by Oxidation of Si(553)–Au Open

Zamin Mamiyev, Michael Tzschoppe, Christian Huck, Annemarie Pucci, H. Pfnür · 2019

Self-assembled Au atomic wires on stepped Si surfaces are metallic, as evidenced by one-dimensionally dispersing plasmonic excitation. Here, we investigate the effects of oxidation on metallicity along such Au atomic wires on a regularly s…

Space charge layer effects in silicon studied by in situ surface transport Open

Frederik Edler, Ilio Miccoli, H. Pfnür, Christoph Tegenkamp · 2019

Electronic properties of low dimensional structures on surfaces can be comprehensively explored by surface transport experiments. However, the surface sensitivity of this technique to atomic structures comes along with the control of bulk …

Anisotropic 2D metallicity: plasmons in Ge(1 0 0)-Au Open

Timo Lichtenstein, Zamin Mamiyev, Eric Jeckelmann, Christoph Tegenkamp, H. Pfnür · 2019

The low-energy plasmonic excitations of the Ge(0 0 1)-Au close to one monolayer coverage of Au were investigated by momentum-resolved high resolution electron energy loss spectroscopy. A very weak plasmonic loss was identified dispersing a…

Extrinsic doping on the atomic scale: Tuning metallicity in atomic Au chains Open

Zamin Mamiyev, Simone Sanna, Timo Lichtenstein, Christoph Tegenkamp, H. Pfnür · 2018

Understanding the response of low-dimensional electronic systems to external perturbations is of great interest for fundamental science as well as future applications. Here we employ plasmon spectroscopy to study the modification of metall…

-Sn phase on Si(111): Spin texture of a two-dimensional Mott state Open

Monika Jäger, C. Brand, A. P. Weber, Mauro Fanciulli, J. Hugo Dil , et al. · 2018

The α-Sn reconstruction on Si(111) is a prototype system for a two-dimensional Mott phase. In this study we performed spin-resolved photoemission experiments and analyzed in detail the spin structure of this electronically correlate…

Spin-resolved band structure of a densely packed Pb monolayer on Si(111) Open

C. Brand, Stefan Muff, Mauro Fanciulli, H. Pfnür, M. C. Tringides , et al. · 2017

Monolayer structures of Pb on Si(111) attracted recently considerable interest as superconductivity was found in these truly two-dimensional (2D) structures. In this study, we analyzed the electronic surface band structure of the so-called…

Tuning the conductivity along atomic chains by selective chemisorption Open

Frederik Edler, Ilio Miccoli, J. P. Stöckmann, H. Pfnür, Christian Braun , et al. · 2017

Adsorption of Au on vicinal Si(111) surfaces results in growth of long-range ordered metallic quantum wires. In this paper, we utilized site-specific and selective adsorption of oxygen to modify chemically the transport via different chann…

Surface state conductivity in epitaxially grown Bi1−xSbx(111) films Open

Julian Koch, Philipp Kröger, H. Pfnür, Christoph Tegenkamp · 2016

Topologically non-trivial surface states were reported first on ${\mathrm{Bi}}_{1-x}$ Sb _x bulk crystals. In this study we present transport measurements performed on thin ${\mathrm{Bi}}_{1-x}$ Sb _x -films (up to 24 nm thickness) grown e…

Conductance through single biphenyl molecules: symmetric and asymmetric coupling to electrodes Open

Karthiga Kanthasamy, H. Pfnür · 2016

Two-dimensional crossover and strong coupling of plasmon excitations in arrays of one-dimensional atomic wires Open

Timo Lichtenstein, J. Aulbach, J. Schäfer, R. Claessen, Christoph Tegenkamp , et al. · 2016

Dimensional crossover is of high relevance to understanding real-world quasi-one-dimensional (1D) systems. Here we study the collective excitations, measured as plasmon dispersions in an electron energy loss experiment, in a tunable family…

Atomic size effects studied by transport in single silicide nanowires Open

Ilio Miccoli, Frederik Edler, H. Pfnür, Stephan Appelfeller, M. Dähne , et al. · 2016

Ultrathin metallic silicide nanowires with extremely high aspect ratios can be easily grown, e.g., by deposition of rare earth elements on semiconducting surfaces. These wires play a pivotal role in fundamental research and open intriguing…

Unoccupied electronic structure and momentum-dependent scattering dynamics in Pb/Si(557) nanowire arrays Open

A. Samad Syed, Vesna Mikšić Trontl, Manuel Ligges, Sung Sakong, Peter Kratzer , et al. · 2015

The unoccupied electronic structure of quasi-one-dimensional reconstructions of Pb atoms on a Si(557) surface is investigated by means of femtosecond time- and angle-resolved two-photon photoemission. Two distinct unoccupied electronic sta…

Electronic structure of self-assembled Ag nanowires on Si(557): spectroscopic evidence for dimensionality Open

C. W. Nicholson, Claude Monney, U Krieg, Christoph Tegenkamp, H. Pfnür , et al. · 2015

We investigate the electronic structure of silver nanowires at 1 monolayer (ML) Ag coverage on a vicinal Si(557) substrate by angle-resolved photoemission spectroscopy. Fermi surface mapping reveals two-dimensional (2D) Ag-induced electron…

Observation of correlated spin–orbit order in a strongly anisotropic quantum wire system Open

C. Brand, H. Pfnür, G. Landolt, Stefan Muff, J. Hugo Dil , et al. · 2015

Conductance through single biphenyl molecules: symmetric and asymmetric coupling to electrodes Open

Karthiga Kanthasamy, H. Pfnür · 2015

The contacts and the chemical bonds formed between metallic electrodes and molecules determine to a large extent the conductive properties of single molecular junctions, which represent the smallest possible active elements in an electroni…

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