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  • Letter

Pseudospin polarization of composite fermions under uniaxial strain

Shuai Yuan1, Jiaojie Yan1,2, Ke Huang1,3, Zhimou Chen1, Haoran Fan1, L. N. Pfeiffer4, K. W. West4, Yang Liu1,*, and Xi Lin1,5,6,†

  • 1International Center for Quantum Materials, Peking University, Beijing 100871, China
  • 2Max Planck Institute for Solid State Research, Stuttgart 70569, Germany
  • 3Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
  • 4Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544, USA
  • 5CAS Center for Excellence in Topological Quantum Computation, University of Chinese Academy of Sciences, Beijing 100190, China
  • 6Interdisciplinary Institute of Light-Element Quantum Materials and Research Center for Light-Element Advanced Materials, Peking University, Beijing 100871, China

  • *liuyang02@pku.edu.cn
  • †xilin@pku.edu.cn
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Phys. Rev. B 109, L081110 – Published 20 February, 2024

DOI: https://doi.org/10.1103/PhysRevB.109.L081110

Abstract

A two-dimensional system with extra degrees of freedom, such as spin and valley, is of great interest in the study of quantum phase transitions. The critical condition when a transition between different multicomponent fractional quantum Hall states appears is one of the very few junctions for many-body problems between theoretical calculations and experiments. In this work, we present that uniaxial strain induces pseudospin transitions of composite fermions in a two-dimensional hole gas. Determined from transport behavior, strain along ⟨111⟩ effectively changes pseudospin energy levels. We deduce that diagonal strain dominates these variations. Our experiment provides a wedge for manipulating two-dimensional interacting systems mechanically.

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Phys. Rev. B 109, L081110– Published 20 February, 2024
  • Received 21 March 2023
  • Revised 29 January 2024
  • Accepted 2 February 2024
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