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11 papers · 1 filter
Exactly Soluble Dynamics of (p,q) String Near Macroscopic Fundamental Strings
Dongsu Bak, Soo-Jong Rey, Ho-Ung Yee
We study dynamics of Type IIB bound-state of a Dirichlet string and n fundamental strings in the background of N fundamental strings. Because of supergravity potential, the bound-s…
Precise Quark Mass Dependence of Instanton Determinant
Gerald V. Dunne, Jin Hur, Choonkyu Lee +1
The fermion determinant in an instanton background for a quark field of arbitrary mass is determined exactly using an efficient numerical method to evaluate the determinant of a pa…
Infrared study of giant dielectric constant in Li and Ti doped NiO
Jung-Ho Kim, Youngwoo Lee, A Souchkov +5
We have measured optical reflectivity of Li and Ti doped NiO (LTNO) in the infrared range at various temperatures. A Drude-like absorption is found at low energy, 100 cm$^{-1}…
Optical spectroscopy study on the electronic structure of
Jungho Kim, S. -J. Oh, Youngwoo Lee +4
The optical conductivity of EuCaB has been obtained from reflectivity and ellipsometry measurements for series of compositions, . The…
A Geometric Look on the Microstates of Supertubes
Dongsu Bak, Yoshifumi Hyakutake, Seok Kim +1
We give a geometric interpretation of the entropy of the supertubes with fixed conserved charges and angular momenta in two different approaches using the DBI action and the superm…
Instanton Determinant with Arbitrary Quark Mass: WKB Phase-shift Method and Derivative Expansion
Gerald V. Dunne, Jin Hur, Choonkyu Lee +1
The fermion determinant in an instanton background for a quark field of arbitrary mass is studied using the Schwinger proper-time representation with WKB scattering phase shifts fo…