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This is an extended version of the Comment that contains the criticism against an applicability of the diffusive transport model for the explanation of the ring-shaped spatial pattern formation in the exciton photoluminescence for the GaAs/AlGaAs double quantum wells [Phys. Rev. Lett. 92, 117404 (2004)]. The model has been used in other similar papers published in the PRL and the PRB afterwards.
The sticking probability of cold atomic hydrogen on suspended graphene calculated by Lepetit and Jackson [Phys. Rev. Lett. {bf 107}, 236102 (2011)] does not include the effect of fluctuations from low-frequency vibrations of graphene. These fluctuati
Comment on cond-mat/0205390; PRL 90, 026805 (2003)
In a recent paper [arXiv:0804.3569], Takatoshi Nomura {it et al.} reported a structural phase transition near 150 K in LaOFeAs and used space group Cmma to describe their X-ray diffraction data. However, they did not discuss how their proposed struct
Comment on the paper: Magnetization Process of Single Molecule Magnets at Low Temperatures of J.F.Fernandez and J.J.Alonso (PRL 91, 047202 (2003)).
We study the formation of an exciton condensate in GaAs coupled quantum wells at low temperatures. We show that the condensate consists of dark excitons, and extends over hundreds of {mu}m, limited only by the boundaries of the mesa. We find that the