Circularly Polarized Optical Stark Effect in CdSe Colloidal Quantum Wells

被引：17

作者：

Diroll, Benjamin T. ^{[1
]}

机构：

[1] Argonne Natl Lab, Ctr Nanoscale Mat, Lemont, IL 60439 USA

来源：

NANO LETTERS | 2020年 / 20卷 / 11期

关键词：

AC Stark Effect; Optical Stark Effect; Nanoplatelets; Circular Dichroism; Autler-Townes Effect;

D O I：

10.1021/acs.nanolett.0c02409

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Colloidal quantum wells, or nanoplatelets, exhibit large, circularly polarized optical Stark effects under sub-band-gap femtosecond illumination. The optical Stark effect is measured for CdSe colloidal quantum wells of several thicknesses and separately as a measure of pump photon energy, pump fluence, and temperature. These measurements show that optical Stark effects in colloidal quantum wells shift the absorption features up to 5 meV, at the intensities up to 2.9 GW.cm(-2) and large detuning (>400 meV) of the pump photon energy from the band edge absorption. Optical Stark shifts are underpinned by large transition dipoles of the colloidal quantum wells (mu = 15-23 D), which are larger than those of any reported colloidal quantum dots or epitaxial quantum wells. The rapid (<500 fs), narrow band blue shift of the excitonic features under circular excitation indicates the viability of these materials beyond light emission such as spintronics or all-optical switching.

引用

页码：7889 / 7895

页数：7

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