Polarization and magneto-optical properties of excitonic emission from wurtzite CdTe/(Cd,Mg)Te core/shell nanowires

Abstract

Wurtzite CdTe and (Cd,Mn)Te nanowires embedded in (Cd,Mg)Te shells are grown by employing vapour-liquid-solid growth mechanism in a system for molecular beam epitaxy. A combined study involving cathodoluminescence, transmission electron microscopy and microphotoluminescence is used to correlate optical and structural properties in these structures. Typical features of excitonic emission from individual wurtzite nanowires are highlighted including the emission energy of 1.65 eV, polarization properties and the appearance B-exciton related emission at high excitation densities. Angle dependent magneto-optical study performed on individual (Cd,Mn)Te nanowires reveals heavy-hole-like character of A-excitons typical for wurtzite structure and allows to determine the crystal field splitting, Δ CR . The impact of the strain originating from the lattice mismatched shell is discussed and supported by theoretical calculations.

Hole and Electron Effective Masses in Single InP Nanowires with a Wurtzite-Zincblende Homojunction

“…This is still the case for GaAs , and GaP. , Recently, the definitive band gap energies of InP and InAs , WZ NWs were ascertained. However, there is only limited investigation on the carrier mass and gyromagnetic factor values of non-nitrides WZ NWs, − which are different from ZB and thus unknown, despite being extremely important for engineering WZ NW devices, where the transport and spin properties play a crucial role.…”

Precise strain mapping of nano-twinned axial ZnTe/CdTe hetero-nanowires by scanning nanobeam electron diffraction

“…This allows the creation of novel types of hybrid structures that could not have been built before. Moreover, the possibility to obtain crystalline structures unusual for a given compound is another important advantage of the use of NWs, e.g., CdTe with wurtzite structure [8,9]. Therefore, devices with novel properties that are unreachable for bulk materials can be engineered.…”