2024-03-29T08:36:08Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/535702018-09-13T09:29:46Zcom_10261_89com_10261_3col_10261_342
2012-07-19T11:05:02Z
urn:hdl:10261/53570
Current self-oscillations, spikes, and crossover between charge monopole and dipole waves in semiconductor superlattices
Sánchez, David
Moscoso, M.
Bonilla, Luis L.
Platero, Gloria
Aguado, Ramón
Self-sustained current oscillations in weakly coupled superlattices are studied by means of a self-consistent microscopic model of sequential tunneling, naturally including boundary conditions. Well-to-well hopping and recycling of charge monopole domain walls produce current spikes - high-frequency modulation - superimposed on the oscillation. For highly doped injecting contacts, the self-oscillations are due to the dynamics of monopoles. As the contact doping decreases, a lower-frequency oscillatory mode due to recycling and motion of charge dipoles is predicted. For low contact doping, this mode dominates and monopole oscillations disappear. At intermediate doping, both oscillation modes coexist as stable solutions and hysteresis between them is possible. ©1999 The American Physical Society.
2012-07-19T11:05:02Z
2012-07-19T11:05:02Z
1999
2012-07-19T11:05:03Z
artículo
Physical Review B 60: 4489-4492 (1999)
http://hdl.handle.net/10261/53570
10.1103/PhysRevB.60.4489
eng
openAccess
American Physical Society