Difference between revisions of "Ultrafast Phenomena"
(Created page with 'Time-resloved pump-probe experiment is a useful tool in studying the dynamics related to electrons, phonons, and spin. The basic analogy of IR pump-probe method is simple that a …') |
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| − | Time-resloved pump-probe experiment is a useful tool in studying the dynamics related to electrons, phonons, and spin. | + | [[Image:pp01.png|left|300px]] |
| − | The basic analogy of IR pump-probe method is simple that a powerful light pulse, usulally labeled the 'pump pulse' of 'excitation pulse', interacts with the sample and excites it into a non-equilibrium state. The sample thereafter relaxes towards a new equilibrium state. This process can be mapped by sending a second much weaker pulse, 'probe pulse', onto a sample. The 'probe pulse' detects a change of optical properties without disturbing the object under investigation. | + | <br> Time-resloved pump-probe experiment is a useful tool in studying the dynamics related to electrons, phonons, and spin. |
| + | <br>The basic analogy of IR pump-probe method is simple that a powerful light pulse, usulally labeled the 'pump pulse' of 'excitation pulse', interacts with the sample and excites it into a non-equilibrium state. The sample thereafter relaxes towards a new equilibrium state. This process can be mapped by sending a second much weaker pulse, 'probe pulse', onto a sample. The 'probe pulse' detects a change of optical properties without disturbing the object under investigation. | ||
Left figure shows simple scheme of this technique. | Left figure shows simple scheme of this technique. | ||
| + | |||
| + | <br><br><br> | ||
| + | [[Image:Pump-probe setup.JPG|right|300px]] | ||
| + | Our research of ultrafast phenomena is investigations non-equilibrium states of electron, phonon, and spins in correlated electron materials, especillay we are interested in rare-earth manganites. | ||
| + | We have executed in phase-sepearted manganite, <math>\rm{La_{1/4}Pr_{3/8}Ca_{3/8}MnO_3</math>, and multiferroic hexagonal manganites <math>\rm{LuMnO_3}</math>. | ||
| + | <br>The setup of pump-probe system is shown in right figure. | ||
| + | |||
| + | <br><br><br> | ||
Revision as of 14:59, 27 August 2009
Time-resloved pump-probe experiment is a useful tool in studying the dynamics related to electrons, phonons, and spin.
The basic analogy of IR pump-probe method is simple that a powerful light pulse, usulally labeled the 'pump pulse' of 'excitation pulse', interacts with the sample and excites it into a non-equilibrium state. The sample thereafter relaxes towards a new equilibrium state. This process can be mapped by sending a second much weaker pulse, 'probe pulse', onto a sample. The 'probe pulse' detects a change of optical properties without disturbing the object under investigation.
Left figure shows simple scheme of this technique.
Our research of ultrafast phenomena is investigations non-equilibrium states of electron, phonon, and spins in correlated electron materials, especillay we are interested in rare-earth manganites.
We have executed in phase-sepearted manganite, <math>\rm{La_{1/4}Pr_{3/8}Ca_{3/8}MnO_3</math>, and multiferroic hexagonal manganites <math>\rm{LuMnO_3}</math>.
The setup of pump-probe system is shown in right figure.
