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Seedless Growth of Bismuth Nanowire Array via Vacuum Thermal Evaporation
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Emptying Dirac valleys in bismuth using high magnetic fields.

Zengwei Zhu1,2, Jinhua Wang1, Huakun Zuo1

  • 1Wuhan National High Magnetic Field Center and School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China.

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|May 20, 2017
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This summary is machine-generated.

Researchers discovered a new magnetic field threshold in bismuth that empties electron valleys, significantly boosting electric conductance. This phenomenon involves carrier transfer between valleys with different mobilities.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Mechanics

Background:

  • Elemental bismuth possesses a unique Fermi surface with three electron pockets, providing valley degrees of freedom.
  • Applying a magnetic field can confine electrons to their lowest Landau level, reaching the quantum limit.

Purpose of the Study:

  • To report the observation of a novel threshold magnetic field (Bempty) in bismuth.
  • To investigate the emptying of electron valleys above this field and its effect on electric conductance.

Main Methods:

  • Experimental observation of magnetoresistance in elemental bismuth.
  • Analysis of carrier behavior and mobility under strong magnetic fields.

Main Results:

  • A threshold magnetic field, Bempty, was identified where one or two electron valleys become empty.
  • A significant enhancement in electric conductance was observed above Bempty.
  • The drop in magnetoresistance is attributed to carrier transfer between valleys with anisotropic mobilities.

Conclusions:

  • The study reveals a new mechanism for manipulating electron valleys using magnetic fields.
  • Carrier transfer between valleys with anisotropic mobilities explains the observed conductance enhancement.
  • While a non-interacting electron model explains most findings, Coulomb interactions might influence fine details.