Optical spectroscopy of an excited Laughlin liquid

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Abstract

Neutral excitations with zero momentum in a Laughlin liquid at an electron filling factor of 1/3 have been studied. It was found that the lowest in energy are spin-magnetogravitons, excitations with a simultaneous change in the electron density in the Laughlin liquid and the spin quantum number of the electron system. The experimental possibility of the formation of new quasi-equilibrium states of anionic matter – Laughlin solutions of spin-magnetogravitons – is demonstrated. A new type of optical scattering is observed in Laughlin solutions.

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About the authors

L. V. Kulik

Osipyan Institute of Solid-State Physics of the Russian Academy of Sciences

Author for correspondence.
Email: kulik@issp.ac.ru
Russian Federation, Chernogolovka

References

  1. Bartolomei H., Kumar M., Bisognin R. et al. // Science. 2020. V. 368. No. 6487. P. 173.
  2. Nakamura J., Liang S., Gardner G.C., Manfra M.J. // Nature Physics. 2020. V. 16. P. 931.
  3. Haldane F.D.M. // Phys. Rev. Lett. 2011. V. 107. P. 116801.
  4. Kulik L.V., Zhuravlev A.S., Musina L.I. et al. // Nature Commun. 2021. V. 12. P. 6477.
  5. Gorbunov A.V., Larionov A.V., Kulik L.V., Timofeev V.B. // J. Appl. Phys. 2022. V. 132. Art. No. 244301.
  6. Kulik L.V., Zhuravlev A.S., Larionov A.V. et al. // Appl. Phys. Lett. 2023. V. 123. Art. No. 083101.

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2. Fig. 1. Signal intensity of elastic backscattering of light as a function of laser excitation power (points; left). The signal intensity is normalised by the proportionality factor α from equation (1). Green, black, and red lines are the root-mean-square, linear, and quadratic functions of the excitation power, respectively. The estimated density of spin-magnetogravitons in the Laughlin liquid (as a fraction of the electron density) as a function of excitation power, obtained from the dependence on the left as n ~ I/(αP)-1 (right). The inset shows a schematic of three optical processes: (a) - spontaneous Stokes Raman scattering of light; (b) - coherent anti-Stokes-Stokes Raman scattering of light (aSSR); (c) - resonant elastic backscattering of light

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