Dirac Fermions in Graphene and Graphiteâa view from angle ...

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1 A universal high energy anomaly in angle resolved photoemission spectra of high temperature superconductors - possible evidence of spinon and holon branches. J. Graf, G.-H. Gweon, K. McElroy, S.Y. Zhou, C. Jozwiak, E. Rotenberg, A. Bill, T. Sasagawa, H. Eisaki, S. Uchida, H. Takagi, D.-H. Lee and A. Lanzara. Phys. Rev. Lett. 98, 067004 (2007). 2 Strong and complex electron-lattice correlation in optimally doped Bi 2 Sr 2 CaCu 2 O 8+δ . G.-H. Gweon, S.Y. Zhou, M.C. Watson, T. Sasagawa, H. Takagi and A. Lanzara. Phys. Rev. Lett. 97, 227001 (2006). 3 Elastic scattering susceptibility of the high temperature superconductor Bi 2 Sr 2 CaCu 2 O 8+δ : a comparison between real and momentum space photoemission spectroscopies. K. McElroy, G.-H. Gweon, S.Y. Zhou, J. Graf, S. I. Uchida, H. Eisaki, H. Takagi, T. Sasagawa, D. -H. Lee, A. Lanzara. Phys. Rev. Lett. 96, 067005 (2006). 4 Oxygen isotope effect on electron dynamics in Bi 2 Sr 2 CaCu 2 O 8+δ : angle-resolved photoemission spectroscopy. T. Sasagawa, A. Lanzara, G.-H. Gweon, S. Zhou, J. Graf, Suryadijaya, H. Takagi. Physica C-superconductivity and its applications 426, 436 (2005). 5 Anomalous isotope effect on the electron dynamics of Bi 2 Sr 2 CaCu 2 O 8+δ high temperature superconductor. G.-H. Gweon, T. Sasagawa, S.Y. Zhou, J. Graf, H. Takagi, D. H. Lee and A. Lanzara. Nature 430, 187 (2004). 6 Strong influence of phonons on the electron dynamics of Bi 2 Sr 2 CaCu 2 O 8+δ . G. -H. Gweon, S.Y. Zhou, A. Lanzara. J. Phys. Chem. Solids 65, 1397 (2004). 7 Lattice dynamics and paired electrons in high temperature superconductors. A. Lanzara, G.-H. Gweon, S.Y. Zhou. Kluwers Academic Publishers B.V., Vol. NATO Science Series II - Mathematics, Physics and Chemistry (2004). Charge density wave: 1 Probing the band structure of LaTe 2 using Angle Resolved Photoemission Spectroscopy. D.R. Garcia, S.Y. Zhou, G.-H. Gweon, M.H. Jung, Y.S. Kwon, A. Lanzara J. Elec. Spec. Relat. Phenom. 156-158, 58 (2007). 2 Revealing charge density wave formation in the LaTe 2 system by Angle Resolved Photoemission Spectroscopy. D.R. Garcia, G.-H. Gweon, S.Y. Zhou, J. Graf, C.M. Jozwiak, M.H. Jung, Y.S. Kwon, A. Lanzara. Phys. Rev. Lett. 98, 166403 (2007). Science Highlights 1 S.Y. Zhou et al, Substrate induced band gap opening in epitaxial graphene, Nature Mat. 6, 770 (2007) • “Graphene: Mind the gap” by Kostya Novoselov, News and Views - Nature Mat. Vol. 6, 720 (2007) 2 S.Y. Zhou et al, First direct observation of Dirac fermions in graphite, Nature Phys. 2, 595 (2006) • “First direct evidence of Dirac fermions in graphite”, ALS News Vol. 277, June 27, 2007 • Selected as Science Highlight for the Advanced Light Source (ALS) annual activity report 2006 3 G.-H. Gweon et al, Anomalous isotope effect on the electron dynamics of Bi 2 Sr 2 CaCu 2 O 8+δ high temperature superconductor, Nature 430, 187 (2004) • “Giant Effects of Lattice-Vibrations on Electron Dynamics in a High-Temperature Superconductor”, Japan Science and Technology Agency, Nov. 2005 vi
• Selected as Science Highlight for the Advanced Light Source (ALS) annual activity report 2005 • Selected as Science Highlight for the Science and Technology Panel DOE, 2004 • “ALS Sheds More Light on High Tc Superconducting Mystery” by Lynn Yarris, The Berkeley Lab View, Sept. 03, 2004 • “Vibrations In Crystal Lattice Play Big Role in High Temperature Superconductors”, Science Daily, Aug. 25, 2004 • “Vibrations in crystal lattice play big role in high temperature superconductors”, PhysOrg.com, Aug. 22, 2004 • “Lattice vibrations play important role in high temperature superconductors” by Robert Sanders, UC Berkeley News, Aug. 16, 2004 Invited Talks and seminars 1 “Substrate-induced band gap opening in epitaxial graphene”, ALS/CXRO seminar, Lawrence Berkeley National Lab, Sept. 2007. 2 “From graphene to graphite - the dynamics of Dirac Fermions and many body interactions”, International Seminar and Workshop ‘Dynamics and Relaxation in Complex Quantum and Classical Systems and Nanostructures’, Max Planck Institute for the Physics of Complex Systems, Dresden, Germany, Sept. 2006. 3 “Dirac Fermions and many body interactions in grapheme and graphite”, condensed matter physics seminar, IMPMC, Universite Pierre et Marie Curie, Paris, France, Sept. 2006. 4 “Electron-lattice interaction in high temperature superconductors: a view from photoemission”, International school of physics ’Enrico Fermi’ - ‘Polarons in bulk materials and systems with reduced dimensionality’, Varenna, Italy, July 2005. Contributed talks 1 “Self energy effect and gap opening in epitaxial graphene”, American Physical Society March Meeting, Denver, CO, USA, March 2007. 2 “Dirac quasiparticles in graphite - a direct experimental view from photoemission”, American Physical Society March Meeting, Baltimore, MD, USA, March 2006. 3 “Coexistence of sharp quasiparticle dispersions and disorder features in graphite”, American Physical Society March Meeting, Los Angeles, CA, USA, March 2005. 4 “Nodal vs. off-nodal kink in optimally-doped Bi2212: an oxygen isotope dependent study”, American Physical Society March Meeting, Montreal, Canada, March 2004. vii
Page 1 and 2: Dirac Fermions in Graphene and Grap
Page 3 and 4: Dirac Fermions in Graphene and Grap
Page 5 and 6: Contents Abstract 1 Contents Acknow
Page 7 and 8: 7.6 Conclusions and implication of
Page 9: Curriculum Vitæ Shuyun Zhou Educat
Page 13 and 14: The unit cell of graphene contains
Page 15 and 16: Projecting this equation into φ(r
Page 17 and 18: Figure 1.5. Schematic drawing of th
Page 19 and 20: Chapter 2 Experimental techniques 2
Page 21 and 22: dispersion E(k z ). Thus k z values
Page 23 and 24: where ɛ is infinitely small. Accor
Page 25 and 26: Langmuirs (1L=10 −6 torr·s) to c
Page 27 and 28: mean free path, E kin is the kineti
Page 29 and 30: a b c d e f graphite SiC f graphite
Page 31 and 32: Figure 3.3. XPS results showing dat
Page 33 and 34: Figure 3.5. Intensity map at -1 eV
Page 35 and 36: Chapter 4 Gap opening in epitaxial
Page 37 and 38: Figure 4.2. Observation of the gap
Page 39 and 40: the EDCs as well as the region of e
Page 41 and 42: Figure 4.7. Dispersions measured in
Page 43 and 44: Figure 4.9. (a-c) LEEM images taken
Page 45 and 46: Figure 4.10. Proposed mechanism for
Page 47 and 48: Chapter 5 Metal-insulator transitio
Page 49 and 50: Figure 5.2. (a) Dispersions through
Page 51 and 52: Figure 5.3. (a-f) Data taken throug
Page 53 and 54: Chapter 6 Dirac fermions and effect
Page 55 and 56: Figure 6.2. Linear Λ-shaped disper
Page 57 and 58: Figure 6.4. Detailed low energy dis
Page 59 and 60: Figure 6.6. Detailed dispersion nea
Page 61 and 62:
Chapter 7 ARPES study of partially
Page 63 and 64:
Figure 7.2. (a) Fermi energy intens
Page 65 and 66:
direction, i.e. perpendicular to gr
Page 67 and 68:
Figure 7.5. ARPES intensity map mea
Page 69 and 70:
Figure 7.7. (a) ARPES intensity map
Page 71 and 72:
Figure 7.9. (a) ARPES intensity map
Page 73 and 74:
19. Hüfner, S. Photoelectron Spect
Page 75 and 76:
59. Jiang, Y. J., Yao, D.-Y., Carls
Page 77 and 78:
99. Luk’yanchuk, I. A. & Kopelevi
Page 79 and 80:
List of Figures 1.1 (a) Sp 2 bondin
Page 81 and 82:
4.8 Thickness dependence of E D and
Page 83 and 84:
7.2 (a) Fermi energy intensity map.
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