Explanipedia

Competing effects of geometrical deformation and band bending on the electronic properties of a nanoscale Schottky junction of PdSe 2 Open

Kai Sotthewes, Aurelian Catalin Galca, Iulia Cojocariu, Tevfik Onur Menteş, M. Szpytma , et al. · 2025

Palladium diselenide (PdSe 2 ) is a two-dimensional (2D) transition metal dichalcogenide van der Waals material that exhibits a unique wrinkled pentagonal structure that results in strong anisotropic layer-dependent properties. Owing to th…

Resonant scattering in low energy electron diffraction: Bi/Ni(111) Open

Bene Poelsema, Martina Tsvetanova, Harold J. W. Zandvliet, Arie van Houselt · 2025

We report Low Energy Electron Diffraction (LEED) diffraction patterns measured at energies up to 50 eV for a monolayer thick Bi film on Ni(111). Surprisingly, the intensity versus energy profiles of several from the ten unique (i.e., symme…

The quantum valley Hall effect in twisted bilayer silicene and germanene Open

Harold J. W. Zandvliet · 2025

We show that twisted bilayers of silicene or germanene can be utilized for a novel transistor concept that relies on the quantum valley Hall effect. The application of an electric field normal to the twisted bilayer allows to tailor the si…

Realization of a one-dimensional topological insulator in ultrathin germanene nanoribbons Open

Dennis J. Klaassen, Lumen Eek, А. Н. Руденко, Esra D. van ’t Westende, Carolien Castenmiller , et al. · 2025

Realizing a one-dimensional (1D) topological insulator and identifying the lower-dimensional limit of two-dimensional (2D) behavior are crucial steps toward developing high-density quantum state networks, advancing topological quantum comp…

Humidity-controlled interactions and lifting of MoS2 on SiO2 Open

Sebastiaan Haartsen, Jantinus Wisman, Harold J. W. Zandvliet, Pantelis Bampoulis · 2025

Fabrication of 2D material devices under ambient conditions faces challenges from humidity-dependent interfacial interactions and doping effects due to intercalated water layers. This study explores adhesion and force dynamics for a monola…

Realization of a one-dimensional topological insulator in ultrathin germanene nanoribbons Open

Dennis J. Klaassen, L. Eek, А. Н. Руденко, Esra D. van`t Westende, Carolien Castenmiller , et al. · 2024

Realizing a one-dimensional (1D) topological insulator and identifying the lower dimensional limit of two-dimensional (2D) behavior are crucial steps toward developing high-density quantum state networks, advancing topological quantum comp…

Molecular switching by proton-coupled electron transport drives giant negative differential resistance Open

Qian Zhang, Yulong Wang, Cameron Nickle, Ziyu Zhang, Andrea Leoncini , et al. · 2024

Image potential states of 2D materials Open

Bogdana Borca, Harold J. W. Zandvliet · 2024

Two-dimensional materials are currently among the most intensively studied topics in condensed matter physics because of their intriguing properties and the possibilities of integration in future electronic device applications. Image poten…

The renaissance of germanium Open

Harold J. W. Zandvliet · 2024

Strain-induced shape transition of VSi2 clusters on Si(111) Open

Valent J.S. Oldenkotte, Stefan E. Vries, M.A. Smithers, Kai Sotthewes, Harold J. W. Zandvliet · 2024

We investigated the growth and shape of vanadium silicide clusters on Si(111) using scanning tunneling microscopy, atomic force microscopy and scanning electron microscopy. The deposition of 8 monolayers of vanadium on Si(111) and subseque…

Moiré-modulated band gap and van Hove singularities in twisted bilayer germanene Open

Pantelis Bampoulis, Carolien Castenmiller, Dennis J. Klaassen, Jelle van Mil, P. L. de Boeij , et al. · 2024

Twisting bilayers of two-dimensional topological insulators has the potential to create unique quantum states of matter. Here, we successfully synthesized a twisted bilayer of germanene on Ge 2 Pt(101) with a 21.8° twist angle, correspondi…

Moiré-modulated band gap and van Hove singularities in twisted bilayer germanene Open

Pantelis Bampoulis, Carolien Castenmiller, Dennis J. Klaassen, Jelle van Mil, P. L. de Boeij , et al. · 2024

Twisting bilayers of two-dimensional topological insulators has the potential to create unique quantum states of matter. Here, we successfully synthesized a twisted bilayer of germanene on Ge2Pt(101) with a 21.8$^o$ degrees twist angle, co…

Molecular Switching by Proton-Coupled Electron Transport Drives Giant Negative Differential Resistance Open

Qian Zhang, Yulong Wang, Cameron Nickle, Ziyu Zhang, Andrea Leoncini , et al. · 2024

To develop new types of dynamic molecular devices with atomic-scale control over electronic function, new types of molecular switches are needed with time-dependent switching probabilities. We report such a molecular switch based on proton…

2024 roadmap on 2D topological insulators Open

Bent Weber, Michael S. Fuhrer, Xian‐Lei Sheng, Shengyuan A. Yang, Ronny Thomale , et al. · 2024

2D topological insulators promise novel approaches towards electronic, spintronic, and quantum device applications. This is owing to unique features of their electronic band structure, in which bulk-boundary correspondences enforces the ex…

The Renaissance of Germanium Open

Harold J. W. Zandvliet · 2024

Strain-Induced Shape Transition of Vsi2 Cluster on Si(111) Open

Valent J.S. Oldenkotte, Stefan E. Vries, Mark Smithers, Kai Sotthewes, Harold J. W. Zandvliet · 2024

A special collection honoring Professor Thom Palstra, an exceptional scientist, leader and mentor Open

Yoshihiro Iwasa, Gabriela Maris, Beatriz Noheda, Harold J. W. Zandvliet, Oana D. Jurchescu · 2024

A special collection in honor of Professor Thom Palstra on the occasion of his retirement.

Presolidification in Eutectic Droplets Open

Bene Poelsema, Zhiguo Zhang, Harold J. W. Zandvliet, Arie van Houselt · 2023

Evidence of presolidification, the counterpart to premelting, is reported. Near the eutectic temperature, T_{C}, the propagation direction of thermal gradient driven motion of eutectic Ge-Pt droplets on Ge(110) is determined by presolidifi…

Sub-micrometer four-point probe transport measurements on graphene Open

Kevin Vonk, J. D. Verbakel, Roeland Huijink, Harold J. W. Zandvliet · 2023

Usually, electronic transport measurements on two-dimensional materials, such as graphene and transition metal dichalcogenides, require deposition of electrodes on top of the material, in, for instance, the form of a Hall bar device. In th…

Photoconductivity Enhancement in Atomically Thin Molybdenum Disulfide through Local Doping from Confined Water Open

J. D. Verbakel, Annelies Dekker, Harold J. W. Zandvliet, Pantelis Bampoulis · 2023

Two-dimensional transition metal dichalcogenide (TMDC) materials have shown great potential for usage in opto-electronic devices, especially down to the regime of a few layers to a single layer. However, at these limits, the material prope…

Quantum Spin Hall States and Topological Phase Transition in Germanene Open

Pantelis Bampoulis, Carolien Castenmiller, Dennis J. Klaassen, Jelle van Mil, Yichen Liu , et al. · 2023

We present the first experimental evidence of a topological phase transition in a monoelemental quantum spin Hall insulator. Particularly, we show that low-buckled epitaxial germanene is a quantum spin Hall insulator with a large bulk gap …

Phase diagram of the square 2D Ising lattice with nearest neighbor and next-nearest neighbor interactions Open

Harold J. W. Zandvliet · 2023

Formulae display:?Mathematical formulae have been encoded as MathML and are displayed in this HTML version using MathJax in order to improve their display. Uncheck the box to turn MathJax off. This feature requires Javascript. Click on a f…

Charge Localization Induced by Pentagons on Ge(110) Open

Dennis J. Klaassen, Carolien Castenmiller, Harold J. W. Zandvliet, Pantelis Bampoulis · 2022

The Ge(110) surface reconstructs into ordered and disordered phases, in which the basic unit is a five-membered ring of Ge atoms (pentagon). The variety of surface reconstructions leads to a rich electronic density of states with several s…

High-Strain-Induced Local Modification of the Electronic Properties of VO2 Thin Films Open

Yorick A. Birkhölzer, Kai Sotthewes, Nicolas Gauquelin, Lars Riekehr, Daen Jannis , et al. · 2022

Vanadium dioxide (VO₂) is a popular candidate for electronic and optical switching applications due to its well-known semiconductor-metal transition. Its study is notoriously challenging due to the interplay of long- and short-r…

High-strain-induced local modification of the electronic properties of VO$_2$ thin films Open

Yorick A. Birkhölzer, Kai Sotthewes, Nicolas Gauquelin, Lars Riekehr, Daen Jannis , et al. · 2022

Vanadium dioxide (VO2) is a popular candidate for electronic and optical switching applications due to its well-known semiconductor-metal transition. Its study is notoriously challenging due to the interplay of long and short range elastic…

Quantum spin Hall states and topological phase transition in germanene Open

Pantelis Bampoulis, Carolien Castenmiller, Dennis J. Klaassen, Jelle van Mil, Yichen Liu , et al. · 2022

The realization of the topological field-effect transistor requires an electric field-induced transition from a topological state with dissipationless conductive channels (`On') to a trivial insulator state (`Off'). Monoelemental and buckl…

Scanning tunneling spectroscopy of two-dimensional Dirac materials on substrates with a band gap Open

Harold J. W. Zandvliet, Qirong Yao, Lijie Zhang, Pantelis Bampoulis, Zhen Jiao · 2022

In this paper we show that conventional current-voltage spectroscopy can provide quantitative information on the dispersion relation of the low-energy electrons of monoelemental group-IV two-dimensional (2D) Dirac materials provided that (…

Self-Assembled Decanethiolate Monolayers on Au(001): Expanding the Family of Known Phases Open

Martina Tsvetanova, A. G. Syromyatnikov, Thomas van der Meer, Arie van Houselt, Harold J. W. Zandvliet , et al. · 2022

We have studied decanethiolate self-assembled monolayers on the Au(001) surface. Planar and striped phases, as well as disordered regions, have formed after exposing the Au surface to a decanethiol solution. The planar phases that we obser…

Microscopic Study of the Spinodal Decomposition of Supported Eutectic Droplets During Cooling: PtGe/Ge{110} Open

Zhiguo Zhang, Bene Poelsema, Harold J. W. Zandvliet, Arie van Houselt · 2022

We embarked on an in situ low-energy electron microscopy, photo-electron emission microscopy, and selected area low-energy electron diffraction study during the cooling of huge eutectic droplets through the critical stages of the eu…

Strong Fermi-Level Pinning in GeS–Metal Nanocontacts Open

Yuxuan Sun, Zhen Jiao, Harold J. W. Zandvliet, Pantelis Bampoulis · 2022

Germanium sulfide (GeS) is a layered monochalcogenide semiconductor with a band gap of about 1.6 eV. To verify the suitability of GeS for field-effect-based device applications, a detailed understanding of the electronic transport mechanis…

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