Changing Spin and Orbital Ground State Symmetries in Colloidal Nanoplatelets with Magnetic Fields

Autor: Jordi Llusar Camarelles, Juan I. Climente
Rok vydání: 2022
Předmět:
Zdroj: Repositori Universitat Jaume I
Universitat Jaume I
ISSN: 1521-3951
0370-1972
DOI: 10.1002/pssb.202200081
Popis: The symmetry of the electronic ground state is of paramount importance in determining the magnetic, optical and electrical properties of semiconductor nanostructures. Here it is shown theoretically that non-trivial spin and orbital symmetries can be induced in colloidal nanoplatelets by applying out-of-plane magnetic fields. Two scenarios are presented. The first one deals with two electrons confined inside a platelet. Here, the strong electron-electron exchange interaction reduces the interlevel energy spacing set by lateral quantum confinement. As a result, relatively weak magnetic fields suffice to induce a singlet-to-triplet spin transition. The second one deals with type-II core/crown nanoplatelets. Here, the crown has doubly-connected topology, akin to that of quantum rings. As a result, the energy levels of carriers within it undergo Aharonov-Bohm oscillations. This implies changes in the ground state orbital symmetry, which switch the exciton and trion optical activity from bright to dark. Funding for open access charge: CRUE-Universitat Jaume I
Databáze: OpenAIRE
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