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High resolution coherent population trapping on a single hole spin in a semiconductor quantum dot
Julien Houel1, Jonathan H Prechtel2, Andreas V Kuhlmann2
1Department of Physics, University of Basel, Klingelbergstrasse 82, CH 4056 Basel, Switzerland and Institut Lumière Matière (ILM), UMR5306 Université Lyon 1/CNRS, Université de Lyon, 69622 Villeurbanne Cedex, France.
Physical Review Letters
|April 1, 2014
Summary
We observed coherent population trapping on a single hole spin in a semiconductor quantum dot, achieving atomic physics-like linewidths. Charge noise was identified as a key factor causing slow spin dephasing in these systems.
Area of Science:
- Quantum Information Science
- Semiconductor Spintronics
- Atomic, Molecular, and Optical (AMO) Physics
Background:
- Coherent population trapping (CPT) is a quantum interference effect used to probe atomic and spin properties.
- Semiconductor quantum dots (QDs) are promising systems for quantum information processing, but spin dephasing remains a challenge.
- Understanding spin dephasing mechanisms is crucial for developing robust quantum technologies based on semiconductor spins.
Purpose of the Study:
- To investigate high-resolution coherent population trapping on a single hole spin in a semiconductor quantum dot.
- To identify the dominant spin dephasing mechanisms affecting hole spins in quantum dots.
- To characterize the role of charge noise in hole spin dephasing.
Main Methods:
- High-resolution optical spectroscopy was employed to observe coherent population trapping.
- The linewidth of the absorption dip, indicative of a dark state, was measured.
- The dependence of the hole spin g factor on the vertical electric field was studied to probe charge noise effects.
Main Results:
- An absorption dip with an atomic physics-like width of 10 MHz, signifying CPT, was achieved.
- Fluctuations in the absorption dip frequency indicated very slow spin dephasing.
- Charge noise was identified as the primary cause of hole spin dephasing, strongly influencing the g factor and optical transition frequency.
Conclusions:
- High-resolution CPT is feasible on single hole spins in semiconductor quantum dots.
- Charge noise significantly impacts hole spin coherence and represents a critical dephasing process.
- These findings are vital for advancing quantum computing and information processing using semiconductor spintronic systems.
