<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="script">PT</mml:mi></mml:mrow></mml:math>-Symmetric Phonon Laser
2014 · Physical Review Letters · 629 citations
https://doi.org/10.1103/physrevlett.113.053604