Intraband exciton relaxation in a biased lattice with long-range correlated disorder

Physics – Condensed Matter – Disordered Systems and Neural Networks

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

Scientific paper

10.1103/PhysRevB.77.134201

We study numerically the intraband exciton relaxation in a one-dimensional lattice with scale-free disorder, in the presence of a linear bias. Exciton transport is considered as incoherent hoppings over the eigenstates of the static lattice. The site potential of the unbiased lattice is long-range-correlated with a power-law spectral density $S(k) \sim 1/k^{\alpha}$, $\alpha > 0$. The lattice supports a phase of extended states at the center of the band, provided $\alpha$ is larger than a critical value $\alpha_c$ [F. A. B. F. de Moura and M. L. Lyra, Phys. Rev. Lett. \textbf{81}, 3735 (1998)]. When the bias is applied, the absorption spectrum displays clear signatures of the Wannier-Stark ladder [E. D\'{\i}az \emph{et al.}, Phys. Rev. B\textbf{73}, 172410 (2006)]. We demonstrate that in unbiased lattices and in weakly correlated potentials the decay law is non-exponential. However, the decay is purely exponential when the bias increases and $\alpha$ is large. We relate this exponential decay to the occurrence of the Wannier-Stark ladder in the exciton band.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

Intraband exciton relaxation in a biased lattice with long-range correlated disorder does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Intraband exciton relaxation in a biased lattice with long-range correlated disorder, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Intraband exciton relaxation in a biased lattice with long-range correlated disorder will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-225531

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.