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VOLUME 49 | ISSUE 9 | PAGE 592
Excess quantum noise in 2D ballistic point contacts
It is shown that if the matrix of the transmission coefficients tnm, which describes the transport, is diagonal and if the tnn are equal to unity or zero, and the conductance G is quantized exactly in units of e2/7rft, the excess noise is absent if the inelastic processes are ignored. The spectral intensity of the excess noise sv (ω) is therefore at a maximum in a narrow range of parameters which correspond to the transition from G = (2/) to G — (e2/'ττίϊ) {η + 1).




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