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Article
Ultrafast terahertz probes of transient conducting and insulating phases in an electron–hole gas
Many-body systems in nature exhibit complexity and self-organization arising from seemingly simple laws. For example, the long-range Coulomb interaction between electrical charges has a simple form, yet is res...
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Article
Macroscopically ordered state in an exciton system
There is a rich variety of quantum liquids—such as superconductors, liquid helium and atom Bose–Einstein condensates—that exhibit macroscopic coherence in the form of ordered arrays of vortices1,2,3,4. Experiment...
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Article
Towards Bose–Einstein condensation of excitons in potential traps
An exciton is an electron–hole bound pair in a semiconductor. In the low-density limit, it is a composite Bose quasi-particle, akin to the hydrogen atom1. Just as in dilute atomic gases2,3, reducing the temperatu...
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Article
Many-body and correlation effects in semiconductors
Solids consist of 1022–1023 particles per cubic centimetre, interacting through infinite-range Coulomb interactions. The linear response of a solid to a weak external perturbation is well described by the concept...
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Article
Carrier transport effects and dynamics in multiple quantum well optical amplifiers
The gain recovery dynamics of multiple quantum well semiconductor optical amplifiers, following gain compression caused by ultrashort optical pulse excitation, have been studied for several devices of differen...
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Article
Optical properties of quasi-zero-dimensional magneto-excitons
We discuss the evolution of optical properties of semiconductor quantum wells, as the quasi-two-dimensional electronic states are further confined into quasi-zero dimensions by a perpendicular magnetic field. ...
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Article
Dynamical NL optics, bistability