RT Journal Article
T1 Wannier-Stark ladder in the linear absorption of a random system with scale-free disorder
A1 Díaz García, Elena
A1 Domínguez-Adame Acosta, Francisco
A1 Kosevich, Yu
A1 Malyshev, Andrey
AB We study numerically the linear optical response of a quasiparticle moving on a one-dimensional disordered lattice in the presence of a linear bias. The random site potential is assumed to be long-range correlated with a power-law spectral density S(k)similar to 1/k(alpha), alpha > 0. This type of correlation results in a phase of extended states at the band center, provided alpha is larger than a critical value alpha(c) [F. A. B. F. de Moura and M. L. Lyra, Phys. Rev. Lett. 81, 3735 (1998)]. The width of the delocalized phase can be tested by applying an external electric field: Bloch-like oscillations of a quasiparticle wave packet are governed by the two mobility edges, playing now the role of band edges [F. Dominguez-Adame , Phys. Rev. Lett. 91, 197402 (2003)]. We demonstrate that the frequency-domain counterpart of these oscillations, the so-called Wannier-Stark ladder, also arises in this system. When the phase of extended states emerges in the system, this ladder turns out to be a comb of doublets, for some range of disorder strength and bias. Linear optical absorption provides a tool to detect this level structure.
PB American Physical Society
SN 1098-0121
YR 2006
FD 2006-05
LK https://hdl.handle.net/20.500.14352/51249
UL https://hdl.handle.net/20.500.14352/51249
LA eng
NO © 2006 The American Physical Society.Work at Madrid was supported by MEC  Project No. MAT2003-01533. Yu.A.K. acknowledges support from Generalitat Valenciana  Grant No. CTESIN/2005/022. V.A.M. acknowledges support from NanoNed, a national nanotechnology programme coordinated by the Dutch Min istry of Economic Affairs, and from ISTC  Grant No. 2679.
NO MEC
NO Generalitat Valenciana
NO NanoNed
DS Docta Complutense
RD 11 abr 2025