4.8 Article

Terahertz Response and Colossal Kerr Rotation from the Surface States of the Topological Insulator Bi2Se3

Journal

PHYSICAL REVIEW LETTERS
Volume 108, Issue 8, Pages -

Publisher

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.108.087403

Keywords

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Funding

  1. Institute for Quantum Matter DOE [DE-FG02-08ER46544]
  2. Gordon and Betty Moore Foundation
  3. NSF [MRI-R2 0959989, DMR-1006078, DMR-0845464]
  4. IAMDN of Rutgers University
  5. ONR [N000140910749]
  6. Direct For Biological Sciences
  7. Div Of Biological Infrastructure [0959989] Funding Source: National Science Foundation
  8. Direct For Mathematical & Physical Scien
  9. Division Of Materials Research [845464] Funding Source: National Science Foundation
  10. Direct For Mathematical & Physical Scien
  11. Division Of Materials Research [1006078] Funding Source: National Science Foundation

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We report the THz response of thin films of the topological insulator Bi2Se3. At low frequencies, transport is essentially thickness independent showing the dominant contribution of the surface electrons. Despite their extended exposure to ambient conditions, these surfaces exhibit robust properties including narrow, almost thickness-independent Drude peaks, and an unprecedentedly large polarization rotation of linearly polarized light reflected in an applied magnetic field. This Kerr rotation can be as large as 65 degrees and can be explained by a cyclotron resonance effect of the surface states.

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