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- W2058777706 abstract "We calculate the frequency-dependent scattering rate M''(ensuremath{omega}), which determines the dynamical conductivity of a disordered two-dimensional electron gas. The existence of plasmons in an interacting electron gas gives rise to a strongly frequency-dependent scattering rate. For ${mathrm{Al}}_{mathrm{x}}$${mathrm{Ga}}_{1mathrm{ensuremath{-}}mathrm{x}}$As/GaAs heterostructures with large spacer width ensuremath{alpha}, we get an analytical result for the scattering rate: M''(ensuremath{omega})=M''(0)[1+Aensuremath{Vert}ensuremath{omega}${mathrm{ensuremath{Vert}}}^{5}$Rexp(-B${mathrm{ensuremath{omega}}}^{2}$)]. The coefficients A and B depend on the Fermi wave number ${k}_{F}$, the effective Bohr radius ${a}^{mathrm{*}}$, and ensuremath{alpha}. $M prime prime ( omega )--- peaks at ${mathrm{ensuremath{omega}}}_{0}$=${mathrm{ensuremath{varepsilon}}}_{mathit{F}}$(5${mathit{a}}^{mathrm{*}}$/ensuremath{alpha}${)}^{1/2}$/(${mathit{k}}_{mathit{F}}$${mathrm{a}}^{mathrm{*}}$), where ${ensuremath{varepsilon}}_{F}$ is the Fermi energy. The high-frequency scattering rate is also calculated: M''(ensuremath{omega}ensuremath{gg}2${ensuremath{varepsilon}}_{F}$)ensuremath{ll}M''(0). We predict a maximum linewidth for plasmons with wave number ${q}_{0}$=5/(4ensuremath{alpha}). The relevance of our theory to anomalies found in cyclotron-resonance experiments is discussed." @default.
- W2058777706 created "2016-06-24" @default.
- W2058777706 creator A5054801786 @default.
- W2058777706 date "1990-02-15" @default.
- W2058777706 modified "2023-10-14" @default.
- W2058777706 title "Enhanced plasmon anomaly in the dynamical conductivity of heterostructures with large spacer" @default.
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- W2058777706 doi "https://doi.org/10.1103/physrevb.41.3608" @default.
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