A team of scientists, led by Dr. David Hsieh from the California Institute of Technology, have observed evidence of stable Hubbard excitons in a photo-doped antiferromagnetic Mott insulator. The findings of their study are published in Nature Physics.
For the spectroscopic measurements, the team chose, which are low-frequency waves ideal for probing the internal structure of excitons.
But rather than simply returning to the original insulating state, the material rapidly transitioned to a different kind of insulating state, one with a spectrum more akin to that of an atom. Unlike the spectra of hydrogen, however, the energy level spacing is only a few millielectronvolts, as expected for a Hubbard excitonic fluid.
"Additionally, the signal from the Hubbard exciton is rather weak. So, we had to suppress sources of noise in our measurements, like fluctuating lab temperatures."The characterization of Hubbard excitons in strongly correlated insulators, as demonstrated by Dr. Hsieh and his team, opens up a realm of exciting possibilities for both fundamental understanding and practical applications.
Future research can delve into fundamental questions about Hubbard excitons, such as their binding mechanisms and interactions with different magnetic states.
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