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High resolution angle resolved photoemission studies on quasi-particle dynamics in graphite

Autor: Leem, C. S., Kim, B. J., Kim, Chul, Park, S. R., Kim, Min-Kook, Johnston, S., Ohta, T., Bostwick, A., Choi, Hyoung Joon, Devereaux, T., Rotenberg, E., Kim, C.

We obtained the spectral function of the graphite H point using high resolution angle resolved photoelectron spectroscopy (ARPES). The extracted width of the spectral function (inverse of the photo-hole lifetime) near the H point is approximately pro

Externí odkaz: http://arxiv.org/abs/0903.0681

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Angle-resolved photoemission spectroscopy of electron-doped cuprate superconductors: Isotropic electron-phonon coupling

Autor: Park, Seung Ryong, Song, D. J., Leem, C. S., Kim, Chul, Kim, C., Kim, B. J., Eisaki, H.

We have performed high resolution angle resolved photoemission (ARPES) studies on electron doped cuprate superconductors Sm2-xCexCuO4 (x=0.10, 0.15, 0.18), Nd2-xCexCuO4 (x=0.15) and Eu2-xCexCuO4 (x=0.15). Imaginary parts of the electron removal self

Externí odkaz: http://arxiv.org/abs/0808.0559

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Novel Jeff = 1/2 Mott State Induced by Relativistic Spin-Orbit Coupling in Sr2IrO4

Autor: Kim, B. J., Jin, Hosub, Moon, S. J., Kim, J. -Y., Park, B. -G., Leem, C. S., Yu, Jaeju, Noh, T. W., Kim, C., Oh, S. -J., Park, J. -H., Durairaj, V., Cao, G., Rotenberg, E.

We investigated electronic structure of 5d transition-metal oxide Sr2IrO4 using angle-resolved photoemission, optical conductivity, and x-ray absorption measurements and first-principles band calculations. The system was found to be well described by

Externí odkaz: http://arxiv.org/abs/0803.2927

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Effect of linear density of states on the quasi-particle dynamics and small electron-phonon coupling in graphite

Autor: Leem, C. S., Kim, B. J., Kim, Chul, Park, S. R., Ohta, T., Bostwick, A., Rotenberg, E., Kim, H. -D., Kim, M. K., Choi, H. J., Kim, C.

We obtained the spectral function of very high quality natural graphite single crystals using angle resolved photoelectron spectroscopy (ARPES). A clear separation of non-bonding and bonding bands and asymmetric lineshape are observed. The asymmetric

Externí odkaz: http://arxiv.org/abs/0708.3420

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Electron Removal Self Energy and its application to Ca2CuO2Cl2

Autor: Kim, Chul, Park, S. R., Leem, C. S., Song, D. J., Jin, H. U., Kim, H. -D., Ronning, F., Kim, C.

Publikováno v: Physical Review B 76, 104505 (2007)

We propose using the self energy defined for the electron removal Green's function. Starting from the electron removal Green's function, we obtained expressions for the removal self energy Sigma^ER (k,omega) that are applicable for non-quasiparticle

Externí odkaz: http://arxiv.org/abs/0708.1358

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Electronic Structure of Electron-doped Sm1.86Ce0.14CuO4: Strong `Pseudo-Gap' Effects, Nodeless Gap and Signatures of Short Range Order

Autor: Park, S. R., Roh, Y. S., Yoon, Y. K., Leem, C. S., Kim, J. H., Kim, B. J., Koh, H., Eisaki, H., Armitage, N. P., Kim, C.

Angle resolved photoemission (ARPES) data from the electron doped cuprate superconductor Sm$_{1.86}$Ce$_{0.14}$CuO$_4$ shows a much stronger pseudo-gap or "hot-spot" effect than that observed in other optimally doped $n$-type cuprates. Importantly, t

Externí odkaz: http://arxiv.org/abs/cond-mat/0612419

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