Photoluminescence upconversion at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>GaAs</mml:mi><mml:mo>/</mml:mo><mml:mi>InGa</mml:mi><mml:msub><mml:mi mathvariant="normal">P</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>interfaces driven by a sequential two-photon absorption mechanism
Physical review. B./Physical review. B