1 / 23

A few topics in Graphene physics Antonio H. Castro Neto

A few topics in Graphene physics Antonio H. Castro Neto. San Sebastian, May 2008. Outline. Coulomb impurity in graphene Vitor M. Pereira, Johan Nilsson, Valeri Kotov Phys.Rev.Lett. 99 , 166802 (2007); arXiv:0803.4195 Anderson impurity in graphene

MikeCarlo
Download Presentation

A few topics in Graphene physics Antonio H. Castro Neto

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. A few topics in Graphene physicsAntonio H. Castro Neto San Sebastian, May 2008

  2. Outline • Coulomb impurity in graphene Vitor M. Pereira, Johan Nilsson, Valeri Kotov Phys.Rev.Lett. 99, 166802 (2007); arXiv:0803.4195 • Anderson impurity in graphene Bruno Uchoa, Chiung-Yuan Lin, Valeri Kotov, Nuno Peres Phys.Rev.B 77, 035420 (2008)‏; arXiv:0802.1711

  3. 6 NO 2 2 4 (1/k)  (103 cm2/Vs) 1 2 0 0 0 1 2 -40 -20 0 20 40 Vg (V) Nim (1012 cm-2) Controlling scattering Geim’s group

  4. 10 10 10 10 16 8 8 8 8 12 4e2/h smin (e2/h) 6 6 6 6 conductivity (mS) conductivity (mS) conductivity (mS) conductivity (mS) 8 4e2/ph X 2 4 4 4 4 4 2 2 2 2 0 0 0 0 0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 -50 -50 -50 -50 0 0 0 0 50 50 50 50 Tail Mobility (m2/V sec) Vg (V) Vg (V) Vg (V) Vg (V) Kim’s group

  5. Pereira et al., Phys.Rev.Lett. 99, 166802 (2007);

  6. Coupling 3D Schroedinger

  7. Undercritical Supercritical

  8. Andrei’s group

  9. HIC Neutron stars

  10. E N(E) Anderson’s Impurity Model

  11. Non-interacting: U=0 V=0 Broadening Energy Energy

  12. Mean-Field

  13. U = 1 eV n_up n_down V=1eV, e0=0.2 eV The impurity moment can be switched on and off!

  14. U = 40 meV U = 0.1 eV

  15. Conclusions • Impurities in graphene behave in an unusual way when compared to normal metals and semiconductors. • One can test theories of nuclear matter under extreme conditions. • Control of the magnetic moment formation of transition metals using electric fields.

More Related