An Exchange-Coupled Donor Molecule in Silicon

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• 作者：M. F. Gonzalez-Zalba ; Andr茅 Saraiva ; Mar铆a J. Calder贸n ; Dominik Heiss ; Belita Koiller ; Andrew J. Ferguson
• 刊名：Nano Letters
• 出版年：2014
• 出版时间：October 8, 2014
• 年：2014
• 卷：14
• 期：10
• 页码：5672-5676
• 全文大小：328K
• ISSN：1530-6992

文摘

We present a combined experimental鈥搕heoretical demonstration of the energy spectrum and exchange coupling of an isolated donor pair in a silicon nanotransistor. The molecular hybridization of the atomic orbitals leads to an enhancement of the one- and two-electron binding energies and charging energy with respect to the single donor case, a desirable feature for quantum electronic devices. Our hydrogen molecule-like model based on a multivalley central-cell corrected effective mass theory incorporating a full configuration interaction treatment of the 2-electron spectrum matches the measured data for an arsenic diatomic molecule with interatomic distance R = 2.3 卤 0.5 nm.

Keywords:

Quantum computing; quantum chemistry; silicon; dopants; transistor; exchange coupling