Voltage-controlled quantum light from an atomically thin semiconductor.
Although semiconductor defects can often be detrimental to device performance, they are also responsible for the breadth of functionality exhibited by modern optoelectronic devices. Artificially engineered defects (so-called quantum dots) or naturally occurring defects in solids are currently being investigated for applications ranging from quantum information science and optoelectronics to high-resolution metrology. In parallel, the quantum confinement exhibited by atomically thin materials (semi-metals, semiconductors and insulators) has ushered in an era of flatland optoelectronics whose full potential is still being articulated. In this Letter we demonstrate the possibility of leveraging the atomically thin semiconductor tungsten diselenide (WSe2) as a host for quantum dot-like defects. We report that this previously unexplored solid-state quantum emitter in WSe2 generates single photons with emission properties that can be controlled via the application of external d.c. electric and magnetic fields. These new optically active quantum dots exhibit excited-state lifetimes on the order of 1 ns and remarkably large excitonic g-factors of 10. It is anticipated that WSe2 quantum dots will provide a novel platform for integrated solid-state quantum photonics and quantum information processing, as well as a rich condensed-matter physics playground with which to explore the coupling of quantum dots and atomically thin semiconductors.
Materials Science, University of Rochester, Rochester, New York 14627, USA.
Chitraleema
C
Chakraborty
1] Department of Physics, University of Rochester, Rochester, New York 14627, USA [2] Center for Coherence and Quantum Optics, University of Rochester, Rochester, New York 14627, USA.
Laura
L
Kinnischtzke
1] Center for Coherence and Quantum Optics, University of Rochester, Rochester, New York 14627, USA [2] Institute of Optics, University of Rochester, Rochester, New York 14627, USA.
Kenneth M
KM
Goodfellow
Material Measurement Lab, National Institute of Standards and Technology Gaithersburg, Maryland 20899, USA.
Ryan
R
Beams
1] Materials Science, University of Rochester, Rochester, New York 14627, USA [2] Center for Coherence and Quantum Optics, University of Rochester, Rochester, New York 14627, USA [3] Institute of Optics, University of Rochester, Rochester, New York 14627, USA.
A Nick
AN
Vamivakas