Fractional Quantum Hall Effect Measurements at Zero <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi mathvariant="italic">g</mi></math></span> Factor

D. R. Leadley; R. J. Nicholas; D. K. Maude; A. N. Utjuzh; J. C. Portal; J. J. Harris; C. T. Foxon

doi:10.1103/PhysRevLett.79.4246

Fractional Quantum Hall Effect Measurements at Zero $g$ Factor

D. R. Leadley, R. J. Nicholas, D. K. Maude, A. N. Utjuzh, J. C. Portal, J. J. Harris, and C. T. Foxon

Phys. Rev. Lett. 79, 4246 – Published 24 November 1997

Abstract

Fractional quantum Hall effect energy gaps have been measured as a function of Zeeman energy. The gap at $ν = 1 / 3$ decreases as the $g$ factor is reduced by hydrostatic pressure. This behavior is similar to that at $ν = 1$ and shows that the excitations are spinlike. At small Zeeman energy, the excitation is consistent with the reversal of 3 spins and may be interpreted as a small composite Skyrmion. At 20 kbar, where $g$ has changed sign, the $1 / 3$ gap appears to increase again.

Received 16 June 1997

DOI:https://doi.org/10.1103/PhysRevLett.79.4246

Authors & Affiliations

D. R. Leadley¹, R. J. Nicholas², D. K. Maude³, A. N. Utjuzh⁴, J. C. Portal³, J. J. Harris⁵, and C. T. Foxon⁶

¹Department of Physics, University of Warwick, Coventry, CV4 7AL, United Kingdom
²Department of Physics, Clarendon Laboratory, Parks Road, Oxford, OX1 3PU, United Kingdom
³Grenoble High Magnetic Field Laboratory, MPI-CNRS, 25 Avenue des Martyrs BP 166, F-38042 Grenoble Cedex 9, France
⁴Russian Academy of Sciences, Institute of High Pressure Physics, 142092 Troitsk, Moscow Region, Russia
⁵Department of Electronic and Electrical Enginering, University College, London, WC1E 7JE, United Kingdom
⁶Department of Physics, Nottingham University, University Park, Nottingham, NG7 2RD, United Kingdom