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7 papers · 2 filters
Exciton formation in graphene bilayer
Raoul Dillenschneider, Jung Hoon Han
Exciton instability in graphene bilayer systems is studied in the case of a short-ranged Coulomb interaction and a finite voltage difference between the layers. Self-consistent exc…
Effect of linear density of states on the quasi-particle dynamics and small electron-phonon coupling in graphite
C. S. Leem, B. J. Kim, Chul Kim +8
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 a…
Surface versus bulk characterization of the electronic inhomogeneity in a VO_{2} film
Y. J. Chang, J. S. Yang, Y. S. Kim +6
We investigated the inhomogeneous electronic properties at the surface and interior of VO_{2} thin films that exhibit a strong first-order metal-insulator transition (MIT). Using t…
Orbital-Driven Electronic Structure Changes and the Resulting Optical Anisotropy of the Quasi-Two-Dimensional Spin Gap Compound La4Ru2O10
S. J. Moon, W. S. Choi, S. J. Kim +4
We investigated the electronic response of the quasi-two-dimensional spin gap compound La4Ru2O10 using optical spectroscopy. We observed drastic changes in the optical spectra as t…
Doped Valence Bond Solid and Superconductivity on the Shastry-Sutherland Lattice
Bohm-Jung Yang, Yong Baek Kim, Jaejun Yu +1
Motivated by recent experiments on SrCu(BO), we investigate the ground states of the doped Mott insulator on the Shastry-Sutherland lattice. To provide a unified theore…
Optical Study of the Free Carrier Response of LaTiO3/SrTiO3 Superlattices
S. S. A. Seo, W. S. Choi, H. N. Lee +4
We used infrared spectroscopic ellipsometry to investigate the electronic properties of LaTiO3/SrTiO3 superlattices (SLs). Our results indicated that, independent of the SL periodi…