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Two-Dimensional Liquid Helium II
엄정인,Hee-GyunOh,Joong-HyunCho,Chul-WonJun,ThomasF.George 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.IV
Through the anomalous excitation spectrum in two-dimensional liquid 4He, which includes the eects of three-phonon processes, derived in the ring-diagram approximation at low temperatures and long wavelengths, the elementary excitation spectrum, super uid density, thermodynamics, structure factor, pair correlation function, phonon decay, various sounds and kinetic coecients are reviewed and compared with experiments.
Exact Quantum Theory of a Lengthening Pendulum
엄정인,J.R.Choi,K.H.Yeon,S.Zhang,T.F.George 한국물리학회 2002 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.41 No.5
The exact wave function, energy eigenvalues and uncertainty relations of a lengthening pendulum are evaluated explicitly through the use of a time-dependent dynamical invariant method. The energy eigenvalues decrease linearly as time goes by, and the minimum value of the uncertainty is larger than ~=2. PACS numbers: 03.65.