Quantum Confinement-Controlled Exchange Coupling in Manganese(II)-Doped CdSe Two-Dimensional Quantum Well Nanoribbons
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- 作者：Rachel Fainblat ; Julia Frohleiks ; Franziska Muckel ; Jung Ho Yu ; Jiwoong Yang ; Taeghwan Hyeon ; Gerd Bacher
- 刊名：Nano Letters
- 出版年：2012
- 出版时间：October 10, 2012
- 年：2012
- 卷：12
- 期：10
- 页码：5311-5317
- 全文大小：383K
- 年卷期：v.12,no.10(October 10, 2012)
- ISSN：1530-6992
文摘
The impact of quantum confinement on the exchange interaction between charge carriers and magnetic dopants in semiconductor nanomaterials has been controversially discussed for more than a decade. We developed manganese-doped CdSe quantum well nanoribbons with a strong quantum confinement perpendicular to the c-axis, showing distinct heavy hole and light hole resonances up to 300 K. This allows a separate study of the s-d and the p-d exchange interactions all the way up to room temperature. Taking into account the optical selection rules and the statistical distribution of the nanoribbons orientation on the substrate, a remarkable change in particular of the s-d exchange constant with respect to bulk is indicated. Room-temperature studies revealed an unusually high effective g-factor up to 13 encouraging the implementation of the DMS quantum well nanoribbons for (room temperature) spintronic applications.