Topological Insulators - GDR Meso
Topological Insulators - GDR Meso Topological Insulators - GDR Meso
Probing Surface States : ARPES Difficulty : doping of bulk / edge Momentum - Spin locking : helical Dirac fermions Not exactly a perfect cone : Hexagonal warping Measure as many properties as possible of the outgoing electron to deduce the momentum, energy, and spin it had while still in the solid This is “angle-resolved photoemission spectroscopy”, or ARPES. Y.L.Chen etal., Science 325,178(2009) K. Kuroda et al., PRL 105, 076802 (2010) mardi 3 janvier 12
Transport measurement on TI Bi2Se3 : good candidate ‣Large band gap : 300 meV ‣Single Dirac surface state Checkelsky et al. PRL, 103 (2010) ... but μb in the conduction band ➡ chemical bulk doping by Ca (CaxBi2-xSe3) Pb of residual transport by bulk states ? Undoped versus doped samples Gi,Mi : Various Ca doping bulk sample (2x2x0.05 mm) mardi 3 janvier 12
- Page 1 and 2: Some Transport properties of Topolo
- Page 3: Surface States of 3D Topological In
- Page 7 and 8: Transport measurement on TI Bi2Se3
- Page 9 and 10: Transport measurement on TI ‣ Bi2
- Page 11 and 12: 2D Dirac Matter A B H = ~v F ( y .k
- Page 13 and 14: Diffusion of 2D Dirac states • Tr
- Page 15 and 16: Study of diffusion of 2D Dirac stat
- Page 17 and 18: (Weak) Localization • Probability
- Page 19 and 20: (Weak) Localization / Quantum trans
- Page 21 and 22: Weak localization : Universality cl
- Page 23 and 24: Weak localization : Universality cl
- Page 25 and 26: Anderson Univ. classes and Topologi
- Page 27 and 28: Anderson Univ. classes and Topologi
- Page 29 and 30: Anisotropic Scattering of Dirac sta
- Page 31 and 32: Anisotropic Scattering of Dirac sta
- Page 33: Conclusion ‣ New playground for u
Probing Surface States : ARPES<br />
Difficulty : doping of bulk / edge<br />
Momentum - Spin locking : helical Dirac fermions<br />
Not exactly a perfect cone :<br />
Hexagonal warping<br />
Measure as many properties as possible of the outgoing electron<br />
to deduce the momentum, energy, and spin it had while still in the solid<br />
This is “angle-resolved photoemission spectroscopy”, or ARPES.<br />
Y.L.Chen etal., Science 325,178(2009)<br />
K. Kuroda et al., PRL 105, 076802 (2010)<br />
mardi 3 janvier 12
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