Hall voltage collapse at filamentary current flow causing chaotic fluctuations inn-GaAs
نویسندگان
چکیده
منابع مشابه
Oscillations and Chaotic Current Fluctuations in n-GaAs
Chaotic current fuctuations have been observed in the negative differential conductivity region of n-GaAs at 4.2 K under static external conditions. Power spectra, Poincar6 sections and the fractal dimension of the attractor were determined as functions of the applied voltage for various magnetic-field strengths B. For B = 0 only limit cycles were observed. For B > 0 our results indicate succes...
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The location of fluctuations occurring in a filamentary current flow is detected by spatially resolved photocurrent measurements using optical interband excitation in n-GaAs at low temperatures. Current fluctuations are only observed in the filament boundaries. In the presence of an external magnetic field, characteristics like the frequency and amplitude of the spontaneous current oscillations...
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1. Halperin B IPhys. Rev. B 25 2185 (1982);MacDonaldAH, Streda P Phys. Rev. B 29 1616 (1984); Jain J K, Kivelson S A Phys. Rev. 37 4276 (1988); Beenakker C W J Phys. Rev. Lett. 64 216 (1990) 2. Wen X-G Int. J. Mod. Phys. B 6 1711 (1992); Phys. Rev. Lett. 64 2206 (1990); Phys. Rev. B 43 11025 (1991) 3. Kane C L, Fisher M P A, Polchinski J Phys. Rev. Lett. 72 4129 (1994); Kane C L, Fisher M P A P...
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Density and magnetic fluctuations arising spontaneously in a narrow field-aligned density striation in a magnetized discharge He plasma are found to exhibit a radial eigenmode structure. The nature of the fluctuations depends upon the electron plasma beta, be . For be greater than the electron to ion mass ratio (be.m/M ) the frequency spectrum exhibits sharply peaked eigenfrequencies with the d...
متن کاملSemiclassical theory of persistent current fluctuations in ballistic chaotic rings
The persistent current in a mesoscopic ring has a Gaussian distribution with small non-Gaussian corrections. Here we report a semiclassical calculation of the leading non-Gaussian correction, which is described by the three-point correlation function. The semiclassical approach is applicable to systems in which the electron dynamics is ballistic and chaotic, and includes the dependence on the E...
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ژورنال
عنوان ژورنال: Physical Review Letters
سال: 1990
ISSN: 0031-9007
DOI: 10.1103/physrevlett.64.212