A Study on the Interaction of Apartment Price and Transaction Volumein Seoul

Abstract

We review a few ideas and experiments that our laboratory at Korea University has proposed and carried out to use vector polarizability β to manipulate alkali-metal atoms. β comes from spin-orbit coupling, and it produces an ac Stark shift that resembles a Zeeman shift. When a circularly polarized laser field is properly detuned between the D 1 and D 2 transitions, an ac Stark shift of a ground-state atom takes the form of a pure Zeeman shift. We call it the "analogous Zeeman effect", and experimentally demonstrated an optical Stern-Gerlach effect and an optical trap that behaves exactly like a magnetic trap. By tuning polarization of a trapping beam, and thereby controlling a shift proportional to β, we demonstrated elimination of an inhomogeneous broadening of a ground hyperfine transition in an optical trap. We call it "magic polarization".We also showed significant narrowing of a Raman sideband transition at a specific well depth. A Raman sideband in an optical trap is broadened owing to anharmonicity of the trap potential, and the broadening can be eliminated by a β-induced differential ac Stark shift at what we call a "magic well depth". Finally, we proposed and experimentally demonstrated a cooling scheme that incorporated the idea of velocity-selective coherent population trapping to Raman sideband cooling to enhance cooling efficiency of the latter outside of the Lamb-Dicke regime. We call it "motionselective coherent population trapping", and β is responsible for the selectivity. We include as Supplementary Material a program file that calculates both scalar and vector polarizabilities of a given alkali-metal atom when the wavelength of an applied field is specified. It also calculates depth of a potential well and photon-scattering rate of a trapped atom in a specific ground state when power, minimum spot size, and polarization of a trap beam are given.

A Dynamic Study on Housing and Stock Market in Europe : Focused on Greece

“…When an error occurs from the long-term equilibrium relationship, the system tends to correct the error and recover this relationship. The model for expressing this error correction is the vector error correction model (Cho, 2006).…”

“…Before the Johansen cointegration test, the test results are sensitively affected by the length of the time difference (p). Therefore, the vector autoregressive models of various time difference are estimated to choose the optimal time difference using the AIC and SC criteria (Engel & Granger, 1987;Cho, 2006;Granger, 2004).…”

Exploring the Making of the Economy in South Korea: A Venue for Sociology and Science and Technology Studies

“…After liberation, economists in South Korea actively translated and studied concepts and methods from Anglo-Saxon macroeconomics. Among these, the idea of national income (GNP) has become perhaps the most crucial concept in research on the South Korean case (Cho 2005; J. W. Hong 2017).…”