Zobrazeno 1 - 10
of 1 004
pro vyhledávání: '"Chemla D"'
Energy- and time-resolved spectroscopy reveals a photoinduced softening of the charge-transfer gap in the insulating copper oxide Sr2CuO2Cl2 that indicates rapid and efficient photoproduction of optical phonons. By relating the pump-probe signal ampl
Externí odkaz:
http://arxiv.org/abs/0910.5048
Publikováno v:
In Revue des Maladies Respiratoires December 2018 35(10):1050-1062
Publikováno v:
Phys. Rev. B. 79, 045320 (2009)
We report a comprehensive experimental study and detailed model analysis of the terahertz dielectric response and density kinetics of excitons and unbound electron-hole pairs in GaAs quantum wells. A compact expression is given, in absolute units, fo
Externí odkaz:
http://arxiv.org/abs/0809.2080
Autor:
Dani, K. M., Cotoros, I. A., Wang, J., Tignon, J., Chemla, D. S., Kavousanaki, E. G., Perakis, I. E.
Publikováno v:
Phys. Rev. B 78, 041301(R) (2008)
Using three-pulse four-wave-mixing femtosecond spectroscopy, we excite a non-radiative coherence between the discrete Landau levels of an undoped quantum well and study its dynamics. We observe quantum beats that reflect the time evolution of the coh
Externí odkaz:
http://arxiv.org/abs/0806.4724
We report a femtosecond response in photoinduced magnetization rotation in the ferromagnetic semiconductor GaMnAs, which allows for detection of a four-state magnetic memory at the femtosecond time scale. The temporal profile of this cooperative magn
Externí odkaz:
http://arxiv.org/abs/0804.3456
We report on the observation of ultrafast photo-enhanced ferromagnetism in GaMnAs. It is manifested as a transient magnetization increase on a 100-ps time scale, after an initial sub-ps demagnetization. The dynamic magnetization enhancement exhibits
Externí odkaz:
http://arxiv.org/abs/cond-mat/0702439
Publikováno v:
Solid State Commun. 140 (2), 72-82 (2006)
We review recent investigations of the femtosecond non-linear optical response of the two-dimensional electron gas (2DEG) in a strong magnetic field. We probe the Quantum Hall (QH) regime for filling factors $\nu \sim 1$. Our focus is on the transien
Externí odkaz:
http://arxiv.org/abs/cond-mat/0607550
Publikováno v:
Phys. Rev. Lett. 97, 057401 (2006)
Using three-pulse four-wave-mixing optical spectroscopy, we study the ultrafast dynamics of the quantum Hall system. We observe striking differences as compared to an undoped system, where the 2D electron gas is absent. In particular, we observe a la
Externí odkaz:
http://arxiv.org/abs/cond-mat/0607545
Publikováno v:
Phys. Rev. Lett. 92, 117404 (2004)
The macroscopic exciton rings observed in the photoluminescence (PL) patterns of excitons in coupled quantum wells (CQWs) are explained by a series of experiments and a theory based on the idea of carrier imbalance, transport and recombination. The r
Externí odkaz:
http://arxiv.org/abs/cond-mat/0308117
We present a theoretical formulation of the coherent ultrafast nonlinear optical response of a strongly correlated system and discuss an example where the Coulomb correlations dominate. We separate out the correlated contributions to the third-order
Externí odkaz:
http://arxiv.org/abs/cond-mat/0211130