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Optical initialization of a single spin-valley in charged WSe2 quantum dots.

Xin Lu1, Xiaotong Chen2, Sudipta Dubey2

  • 1Department of Physics, Emory University, Atlanta, GA, USA. xin.lu2@emory.edu.

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|March 6, 2019
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Researchers demonstrated single charge spin-valley control in WSe2 quantum dots, crucial for advancing quantum information technology and valleytronics. This breakthrough shows potential for new quantum sensing applications.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Information Science
  • Materials Science

Background:

  • Single charge and spin control are key for quantum information technology, spintronics, and quantum sensing.
  • Atomically thin transition-metal dichalcogenide monolayers are promising for valleytronics due to their spin-valley locked index.
  • Previous research focused on ensemble control, with single charge valley control remaining unexplored due to short exciton lifetimes.

Purpose of the Study:

  • To provide evidence for localized single holes with net spin in WSe2 quantum dots.
  • To demonstrate the initialization of the spin-valley state of individual charges using laser helicity.
  • To explore the potential for single-charge-based valleytronics and its implications for quantum technologies.

Main Methods:

  • Utilized optically active WSe2 quantum dots.
  • Employed laser excitation with specific helicity under small magnetic fields to initialize spin-valley states.
  • Measured recombination times to estimate valley lifetimes of single charges.

Main Results:

  • Unambiguous evidence for localized holes with net spin in WSe2 quantum dots was observed.
  • Successful initialization of the spin-valley state of single charges was achieved using polarized light.
  • A lower bound for the single-charge valley lifetime in quantum dots was estimated to be in the nanosecond range.

Conclusions:

  • The study extends two-dimensional valleytronics to the single spin-valley level.
  • The presence of excess charge in quantum dots significantly prolongs valley lifetime, unlike in neutral quantum dots.
  • Findings have significant implications for developing quantum information processing and quantum sensing technologies.