Zeitschriftenaufsätze

Excitons, the correlated electron-hole pairs governing optical and transport properties in organic semiconductors, have long resisted direct experimental access to their full quantum-mechanical wave functions. Here, we use femtosecond time-resolved photoemission orbital tomography (trPOT) combining high-harmonic probe pulses with time- and momentum-resolved photoelectron spectroscopy to directly image the momentum-space distribution and ultrafast dynamics of excitons in 𝛼-sexithiophene thin films. [...]

Recent theoretical studies highlight hollow-core semiconductor-superconductor hybrid nanowires as a promising platform to engineer topological superconductivity via the Little-Parks effect and phase-winding of the superconducting order parameter. Such nanowires exhibit enhanced spatial confinement of carriers, potentially enlarging the accessible topological phase space compared to conventional core/full-shell structures. [...]