Modulating Spin-Valley Relaxation in WSe2 with Variable Thickness VOPc Layers: Article No. 041405

Daphne Lubert-Perquel, Byeong Wook Cho, Alan Phillips, Young Hee Lee, Jeffrey Blackburn, Justin Johnson

Research output: Contribution to journalArticlepeer-review

Abstract

Combining the synthetic tunability of molecular compounds with the optical selection rules of transition metal dichalcogenides (TMDCs) that derive from spin-valley coupling could provide interesting opportunities for the readout of quantum information. However, little is known about the electronic and spin interactions at such interfaces and the influence on spin-valley relaxation. In this work, vanadyl phthalocyanine (VOPc) molecular layers are thermally evaporated on WSe2 to explore the effect of molecular layer thickness on excited-state spin-valley polarization. The thinnest molecular layer supports an interfacial state which destroys the spin-valley polarization almost instantaneously, whereas a thicker molecular layer results in longer-lived spin-valley polarization than the WSe2 monolayer alone. The mechanism appears to involve a tightly bound species at the molecule/TMDC interface that strengthens exchange interactions and is largely avoided in thicker VOPc layers that isolate electrons from WSe2 holes.
Original languageAmerican English
Number of pages9
JournalChemical Physics Reviews
Volume5
Issue number4
DOIs
StatePublished - 2024

NREL Publication Number

  • NREL/JA-5900-87750

Keywords

  • 2D materials
  • exciton
  • quantum sensing
  • spectroscopy
  • spin

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