Effects of tunneling coupling on plasmon modes in asymmetric double-quantum-well structures View Full Text


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Article Info

DATE

2001-11

AUTHORS

Xin-Hai Liu, Xue-Hua Wang, Ben-Yuan Gu

ABSTRACT

The collective charge density excitations in asymmetric double-quantum-well (DQW) structures with different tunneling strengths are systematically studied. In particular, the damping properties of the plasmon modes in various tunneling strengths are investigated in detail. It is shown that plasmon modes in asymmetric DQW structures are quite different from those in symmetric DQW systems. In weak tunneling regime, an intra-subband mode ω- with an acoustic-like dispersion relation which is damped in symmetric DQW structures arises and coexists with the optical-like mode ω+ while the inter-subband mode ω10 is highly damped. With the tunneling strength being increased, the ω10 branch gradually becomes undamped and emerges out of the (1-0) single-particle continuum, whereas the ω- branch gradually approaches the (0-0) single-particle continuum. In intermediate coupling regime, these three branches of modes coexist undamped. In strong tunneling regime, ω- enters the (0-0) single-particle continuum and becomes damped. Consequently, only the ω+ and ω10 modes exist in this regime. More... »

PAGES

37-41

Journal

TITLE

The European Physical Journal B

ISSUE

1

VOLUME

24

Author Affiliations

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s100510170019

DOI

http://dx.doi.org/10.1007/s100510170019

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1029450708


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