Singlet and triplet trions in WS2 monolayer encapsulated in hexagonal boron nitride

Nanotechnology
D VaclavkovaMaciej R Molas

Abstract

Embedding a WS2 monolayer in flakes of hexagonal boron nitride allowed us to resolve and study the photoluminescence response due to both singlet and triplet states of negatively charged excitons (trions) in this atomically thin semiconductor. The energy separation between the singlet and triplet states has been found to be relatively small reflecting rather weak effects of the electron-electron exchange interaction for the trion triplet in a WS2 monolayer, which involves two electrons with the same spin but from different valleys. Polarization-resolved experiments demonstrate that the helicity of the excitation light is better preserved in the emission spectrum of the triplet trion than in that of the singlet trion. Finally, the singlet (intravalley) trions are found to be observable even at ambient conditions whereas the emission due to the triplet (intervalley) trions is only efficient at low temperatures.

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Citations

May 28, 2019·Nature Communications·T P LyonsA I Tartakovskii
Feb 15, 2019·Scientific Reports·Maciej R MolasAdam Babiński
Aug 20, 2020·Physical Chemistry Chemical Physics : PCCP·Piotr KapuścińskiMaciej R Molas
Aug 28, 2020·Nanoscale·M ZinkiewiczM R Molas
Nov 9, 2019·Physical Review Letters·Ashish AroraRudolf Bratschitsch
Jul 28, 2020·The Journal of Chemical Physics·Jonas ZipfelAlexey Chernikov
Sep 17, 2019·Physical Review Letters·M R MolasM Potemski
Nov 18, 2018·Nanotechnology·Xinsheng WangLiming Xie
Nov 8, 2019·Physical Review Letters·M R MolasM Potemski
Aug 24, 2020·The Journal of Chemical Physics·Thomas GoldsteinJun Yan
Mar 11, 2020·Nature Nanotechnology·Etienne LorchatStéphane Berciaud
Jan 16, 2021·Physical Review Letters·Koloman WagnerAlexey Chernikov
Mar 9, 2021·Nano Letters·Małgorzata ZinkiewiczMaciej R Molas
Jun 28, 2019·The Journal of Physical Chemistry Letters·Peng FanAnlian Pan
Jul 28, 2019·ACS Applied Materials & Interfaces·Krishna MuraliKausik Majumdar
Sep 17, 2021·Nature Communications·Cedric RobertXavier Marie

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