Abstract
We present magnetic resonance studies of two-dimensional atomic hydrogen gas (H↓) in 4.6 T field at temperatures 70–100 mK i.e. well in the quantum gas or cold collision regime. Electron spin resonance at 128 GHz and nuclear magnetic resonance at 910 MHz were used to detect and manipulate populations of the hyperfine manifold of the electronic ground state. Using a coherent two-photon excitation we demonstrated effects of electromagnetically induced transparency and absorption as well as coherent population trapping in the 2D H gas. We performed a measurement of the magnetic resonance line shifts associated with exchange and dipolar interactions. The cold collision (clock) shift measured for the 2D case is two orders of magnitude smaller than predicted by the mean field theory and is of the same order as the internal dipolar field.
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Ahokas, J., Järvinen, J. & Vasiliev, S. Magnetic Resonance Studies of Cold Atomic Hydrogen Gas. J Low Temp Phys 150, 577–586 (2008). https://doi.org/10.1007/s10909-007-9602-8
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DOI: https://doi.org/10.1007/s10909-007-9602-8