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Related Experiment Video

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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope

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Hyperfine-field-mediated spin beating in electrostatically bound charge carrier pairs.

D R McCamey¹, K J van Schooten, W J Baker

¹Department of Physics and Astronomy, University of Utah, 115 South 1400 East, Salt Lake City, Utah 84112, USA.

Physical Review Letters

|April 7, 2010

Summary

Researchers studied electron-hole pairs in organic semiconductors to understand hyperfine coupling. They observed spin beating in current modulation, enabling measurement of hyperfine fields for spintronics and decoherence studies.

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All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics

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Published on: January 19, 2018

Area of Science:

Organic electronics
Spintronics
Quantum information science

Background:

Organic semiconductors enable unique studies of spin interactions.
Hyperfine coupling between electronic spins and nuclear spins is crucial in these materials.
Understanding these interactions is key for advancing organic spintronics and quantum technologies.

Purpose of the Study:

To investigate the interaction of spins within electron-hole pairs in organic semiconductors.
To probe the effects of inhomogeneous hyperfine fields on spin dynamics.
To develop a method for measuring hyperfine fields at the scale of single carrier pairs.

Main Methods:

Utilized organic light-emitting diodes (OLEDs) for experimental setup.
Employed coherent spin-resonant excitation to drive spin dynamics.
Monitored current modulation to observe spin beating and Rabi flopping phenomena.

Main Results:

Observed distinct spin beating patterns in current modulation under specific driving field conditions.
Demonstrated that both electron and hole spins precess when the driving field overcomes the hyperfine field difference.
Successfully measured the magnitude and spatial variation of hyperfine fields at the single carrier pair level.

Conclusions:

The observed spin beating is a powerful tool for probing hyperfine interactions in organic semiconductors.
This technique allows for precise measurement of hyperfine fields, crucial for evaluating magnetoresistance models.
The findings contribute to improving organic spintronics devices and understanding spin decoherence mechanisms.