Electron spectroscopy on high temperature superconductors and other novel materials. Gey Hong Gweon
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1 Electron spectroscopy on high temperature superconductors and other novel materials Gey Hong Gweon Jan 28, 2013
2 Kazue Mastuyama Jianqiao Meng Ahram Kim Greg Kaminsky Matthew Brunner Brandon McGuire James Hinton Jacob Stanley Sriram Shastry S. I. Lee, K. H. Lee, H. G. Lee (POSTECH, Korea) Genda Gu, J. S. Wen, Z. J. Xu (Brookhaven N. Lab.) Takao Sasagawa (Tokyo institute of technology) Kai Rossnagel (Kiel, Germany) Jan 28, 2013 Phys 205
3 ARPES on Novel Materials Gweon et al., Nature 2004 Graf, Gweon et al., PRL 2007 (High E kink) Jan 28, 2013 Rollings, Gweon et al., JPCS 2006 Zhou, Gweon et al., Nature Materials 2007
4 ARPES on high Tc Cuprates Pseudo gap and charge order in high temperature superconductors Jan 28, 2013 Gweon et al., PRL 11 Meng, Gweon et al., PRB RC 11
5 ARPES on New Quantum Materials Topological Insulator Insulating bulk Conducting surface Robust conducting surface guaranteed by topology Hsieh, Hasan, et al. PRL 2009 Jan 28, 2013
6 On going Research High Tc superconductors Strange normal state line shapes ( non Fermi liquid ) Fermi surface sum rule ( Luttinger sum rule ) Line shapes of quasi 1D cuprates ( Luttinger liquid ) Topological insulators Bulk carrier density Normal line shapes TiTe2 (reference to High Tc), LaCoO3 Jan 28, 2013
7 Novel state of matter R ( ) 1911 T (K)
8 Meissner effect (1933) 4 0
9 Exclusion of the EM field (massive photons) D. van Der Marel, J. Sc, vol. 17, 559 ( 04) Also, see K. Kadowaki, et al., Phys. Rev. B vol. 56, 5617 (1997).
10 Bednorz and Mülller "for their important break through in the discovery of superconductivity in ceramic materials (1987) outreach.phy.cam.ac.uk/physics_at_work/2005/exhibit/irc.php
11 "for their important break through in the discovery of superconductivity in ceramic materials for Bednorz and Mülller P. W. Anderson, 2010
12 Conventional SC the normal state is well understood. A good metal described by the Landau theory. Cool down a good metal we get a superconductor! High Tc the normal state is a bad metal. Cool down a bad metal we get a high Tc!
13 Anderson, Nat Phys, 2006
14 Temperature Strange Metal Hole doping (p) Hanaguri et al., Nature 2004 Jan 28, 2013 Phys 205
15 Angle Resolved Photo Electron Spectroscopy Measures the k resolved DOS Finger prints or pictures of electrons/holes
16 Einstein and Photoelectric Effect Angle Resolved Photo Electron Spectroscopy (ARPES) Final Vacuum e h Momentum and Energy Conservation IN e OUT z x y Initial Sample
17 Jan 28, 2013 Non Lorentzian Line Shapes! (Strong Asymmetry and large background) Width is roughly linear in peak position ImΣ? Marginal Fermi liquid (MFL) provided explanation and good fits (Abrahams and Varma PNAS 2000, Kaminski et al. PRB 2001) Olson, PRB 90 Phys 205
18 Many theories have been, and are being, proposed to crack the mystery. Marginal Fermi liquid theory (Varma 89) Fermi liquid theory (Olson 90) Hidden Fermi liquid theory (Anderson 11) Extremely correlated Fermi liquid theory (Shastry 11)
19 High temperature superconductivity Quantum Critical! It's RVB! RVB! It's (almost) Fermi Liquid... It's DDW! It's Phonons! It's Stripes! Jan 28,
20 Extremely Correlated Fermi Liquid Theory (t J model solution) Shastry, Phys. Rev. Lett. 107, (2011) What is new? The ECFL solution is a novel solution to the t J model. Jan 28, 2013 Phys 205
21 Physics for the parameter regime that flows to the fixed point Rice 1988 Anderson
22 SECFL GHG, Shastry, Gu, PRL, 2011
23 Laser ARPES Data Photon energy = 6 ev Sharp peaks ev is the main fit parameter outcome Jan 28, 2013 Phys 205
24
25 Jan 28, 2013 GHG, Shastry, Gu, Phys. Rev. Lett., 107, (2011) Phys 205
26 Play with a bit. Jan 28, 2013 Phys 205
27 For the first time, EDCs are explained well for different experiments (laser ARPES, conventional ARPES), and different samples (BISCO, LSCO). Satisfies the global particle sum rule. Energy scales are not arbitrary, but locked with respect to each other. The energy scales are natural candidates for explaining what we call ARPES kinks.
28 ARPES kinks High Energy kink Graf, GHG et al., PRL 07 GHG et al., PRL 06 Low Energy kink Jan 28, 2013 Phys 205
29 pecfl K Matsuyma, GHG, under review in PRL
30 Simplified ECFL (secfl) and phenomenological ECFL (pecfl) are both phenomenological efforts (pecfl more so) that parallel more first principles approach (Shastry, Hansen). The goal is to recognize features of the theory and the experiment that agree (or not), while paying attention to global sum rules, energy scales, analyticity, causality, etc. Keep the strengths of secfl. Extend the secfl to make it more powerful.
31
32 Bi2212 OPT91 secfl pecfl (MD) pecfl (MI)
33 Bi2212 OPT91 secfl pecfl (MD) pecfl (MI)
34 Bi2212 OPT91 secfl pecfl (MD) pecfl (MI)
35 Bi2212 OPT91 secfl pecfl (MD) pecfl (MI)
36
37 Meevasana et al. PRB, 08
38 p p Data by Zhou, Yoshida, et al.
39 We are cracking the hardest part of the high Tc puzzle in Santa Cruz!!
40 The ECFL works extremely well! The asymmetry in the energy distribution curves (EDC) is described well by the ECFL model. The momentum distribution curves (MDCs) are described well by a phenomenological extension of the secfl model. Unprecedented degree of success to understand the ARPES using a strongly correlated electron model. Universal features and non universal features future work. Jan 28, 2013 Phys 205
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