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Related Experiment Videos

Anomalous Anderson localization behaviors in disordered pseudospin systems.

A Fang1,2, Z Q Zhang1,2, Steven G Louie2,3,4

  • 1Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China.

Proceedings of the National Academy of Sciences of the United States of America
|April 6, 2017
PubMed
Summary

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This summary is machine-generated.

We found unique Anderson localization in pseudospin systems. Pseudospin-1 systems exhibit distinct behaviors, including an abrupt transition in localization length at a critical random potential strength.

Area of Science:

  • Condensed Matter Physics
  • Quantum Mechanics
  • Disordered Systems

Background:

  • Anderson localization describes wave function confinement in disordered media.
  • Pseudospin systems, particularly pseudospin-1, possess unique electronic properties like conical band structures.
  • Conventional disordered systems show standard localization behaviors.

Purpose of the Study:

  • To investigate the Anderson localization phenomena in one-dimensional (1D) disordered pseudospin systems.
  • To differentiate the localization behaviors of pseudospin-1 and pseudospin-1/2 systems.
  • To analyze the impact of random potential strength and incident angle on localization length.

Main Methods:

  • Theoretical analysis of wave propagation in a 1D disordered potential.
Keywords:
disorderevanescent waveslocalizationphotonic crystalspseudospin

Related Experiment Videos

  • Investigation of pseudospin-1 and pseudospin-1/2 systems.
  • Examination of localization length dependence on random potential strength and incident angle.

    • Main Results:

    • Pseudospin-1 systems show unique localization: length decreases with disorder, then abruptly increases after a critical random potential strength.
    • A sharp transition in localization length at [Formula: see text] is observed for pseudospin-1 systems due to evanescent waves.
    • Pseudospin-1/2 systems exhibit a smooth transition in localization length as disorder increases.

    Conclusions:

    • Anderson localization in pseudospin-1 systems deviates significantly from conventional systems.
    • The critical random potential strength ([Formula: see text]) and incident angle play crucial roles in determining localization behaviors.
    • Evanescent wave emergence at [Formula: see text] causes the abrupt transition in pseudospin-1 systems, a novel finding.