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Volumn 45, Issue 19, 1992, Pages 11342-11345

Rf conductivity of a two-dimensional electron system at small Landau-level filling factors

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EID: 0001430907     PISSN: 01631829     EISSN: None     Source Type: Journal    
DOI: 10.1103/PhysRevB.45.11342     Document Type: Article
Times cited : (98)

References (27)
  • 20
    • 85032069152 scopus 로고
    • The electron diffusivity D can be included in Eq. (1) by replacing σxx with σ xxeff = σxx/( 1 - jDk2/ ω ). Because D approx lB2/ τ << νs2/ omega, the effect is small. In the above estimate τ approx hbar / Δ E, where Δ E approx 1 K is the width of the Landau level for our high-mobility electron gas. Equation (1) is also valid only when the wavelength λ > lin, where lin is an intrinsic length scale of the systemlike mean free path of the current carriers. In high magnetic field the relevant length scale is lB, which is less than 100 Å and our wavelength lambda. For the D and lin estimates see, p. 539. Also σm is slightly frequency dependent and can be calculated from σm= σm(0) εpekd/ [ εpcosh (kd) + ε0sinh (kd) ] ~, where d is the distance between the free surface and the 2DES. See, for example, 64, 1959, A. L. Efros, Yu. M. Galperin, Phys. Rev. Lett.
    • (1982) Rev. Mod. Phys. , vol.54 , pp. 437
    • Ando, T.1
  • 21
    • 0000152575 scopus 로고
    • Wassermeyer et al. [, ] found recently edge magnetoplasmons (EMP) in the 2DES in GaAs. Based on their results, in our samples (3 times 5 mm2) the EMP resonance should be below 50-MHz frequencies for ν = 0.2. We also estimate the coupling between the SAW and EMP to be extremely weak.
    • (1990) Phys. Rev. B , vol.41 , pp. 10287
  • 25
    • 84927887148 scopus 로고    scopus 로고
    • most of the spectral weight for the sum rule is under the cyclotron resonance peak at ωc.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.