Relativistic fermions that are incident on a high potential barrier can pass through
unimpeded, a striking phenomenon termed the 'Klein paradox'in quantum electrodynamics …

Electronic and optical properties of molecules and molecular solids are traditionally
considered from the perspective of the frontier orbitals and their intermolecular interactions …

Image-potential states of graphene on various substrates have been investigated by two-
photon photoemission and scanning tunneling spectroscopy. They are used as a probe for …

Because synthetic 2D materials are generally stabilized by interfacial coupling to growth
substrates, direct probing of interfacial phenomena is critical for understanding their …

The unoccupied electronic states of epitaxially grown graphene on Ru (0001) have been
explored by time-and angle-resolved two-photon photoemission. We identify a Ru derived …

We have measured the two-dimensional image potential states (IPS) of a germanene layer
synthesized on a Ge 2 Pt crystal using scanning tunnelling microscopy and spectroscopy …

Free-electron-like image potential states are observed in scanning tunneling spectroscopy
on graphene quantum dots on Ir (111) acting as potential wells. The spectrum strongly …

Two-dimensional transition metal carbides and nitrides (named as MXenes) and their
functionalized ones exhibit various physical and chemical characteristics. For example, it …

Two-dimensional materials are currently among the most intensively studied topics in
condensed matter physics because of their intriguing properties and the possibilities of …

Laterally localized electronic states are identified on a single layer of graphene on
ruthenium by low temperature scanning tunneling spectroscopy (STS). The individual states …