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RESONANT AND ROUND‐TRIP GAIN FOR ACOUSTOELECTRIC DOMAINS IN n‐InSb
1.R. Bray, C. S. Kumar, J. B. Ross, and P. O. Sliva, J. Phys. Soc. Japan, Suppl. 21, 483 (1966).
2.J. B. Ross and R. Bray, Bull. Amer. Phys. Soc. Series II 12, 119 (1967).
3.K. Nill and A. McWhorter, J. Phys. Soc. Japan, Suppl. 21, 755 (1966). The equivalent enhancement of the acoustoelectric attenuation by magnetic field was studied in this work, for the case of microwave‐injected flux.
4.D. L. White, J. Appl. Phys. 33, 2547 (1962).
5.M. C. Steele, RCA Rev. 28, 58 (1967);
5.a similar result (without the angular dependence in Eq. (2) below) was obtained by C. Hervouet, Phys. Stat. Sol. 21, 117 (1967),
5.based on a general theory of H. N. Spector, Phys. Rev. 130, 910 (1963).
6.M. Kikuchi, H. Hayakawa, and Y. Abe, Japan J. Appl. Phys. 5, 1259, 1260 (1966).
7.C. W. Turner and J. Crowe, Appl. Phys. Letters 11, 187 (1967).
8.G. S. Kino and R. Route, Appl. Phys. Letters 11, 312 (1967).
9.In these constant‐current experiments, we observed no evidence for the formation of narrow, propagating domains, nor for a transient generation mechanism.
10.In the criterion for round‐trip acoustoelectric gain, we use the empirical value for rather than its theoretical value, which is much smaller, as discussed in the last section of this Letter.
11.The condition for observation of resonant gain and round‐trip gain is, of course, obtained in photoconducting CdS, without magnetic field (ref. 4). In the constant‐voltage mode, the cumulative buildup of flux in this material over many round trips, along with current oscillations, was observed by J. H. McFee, J. Appl. Phys. 34, 1548 (1963). The experiments in CdS, however, did not reveal the resonant gain feature in this context of internally generated flux and domain formation.
12.Kino and Route (ref. 8) assumed the threshold and maximum gain conditions to be equivalent. Their analysis of the observed decrease in threshold current with increasing magnetic field is therefore in error.
13.The importance of considering amplification of off‐axis flux was emphasized by S. G. Eckstein, Phys. Rev. 131, 1087 (1963).
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