The velocity‐field characteristics of stressed n‐type germanium at 300 °K have been theoretically obtained assuming a Maxwellian velocity distribution function. It is found that the experimentally observed bulk negative differential conductivity cannot be explained if the carriers are assumed to be confined to the 〈111〉 valleys only. The experimental results on the other hand may be fitted if carrier scattering to the 〈100〉 valleys is taken into account and the mobility of the carriers in these valleys is taken to be 690 cm2 V−1 s−1. Copyright © 1970 WILEY‐VCH Verlag GmbH &amp; Co. KGaA, Weinheim

DIPANKAR CHATTOPADHYAY

Polymer Science and Technology

B R NAG

University of Calcutta (informally known as Calcutta University or CU) is a collegiate public state university located in Kolkata, West Bengal, India.&nbsp;Within India it is recognized as a &quot;Five-Star University&quot; and accredited &quot;A&quot; Grade by National Assessment and Accreditation Council.

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The University of Calcutta has secured the Fifth position among the Universities of India in the prestigious &quot;Indian University Ranking 2019&quot; list, released by the NIRF of the Ministry of Human Resource Development, Government of India.

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It was established on 24 January 1857, and was one of the first institutions in Asia to be established as a multidisciplinary and Western-style university. Its alumni and faculty include several heads of state, heads of government, social reformers, prominent artists, only academy award winner and Dirac medal winner in India, many Fellows of the Royal Society and five Nobel laureates as of 2019 which is highest in South Asia.

University Of Calcutta

physica status solidi (b)

The hot-electron characteristic of n-germanium at room temperature is theoretically derived taking into account the effects of the 100 valleys and the nonparabolicity of the 111 valleys. It is shown that the experimental results may be explained by theory only when both these effects are included. © 1972 The American Physical Society.

Physical Review B

High-field scattering mechanisms in n-germanium at 300 Â°K

Room-temperature velocity-field characteristics of n-type germanium have been calculated taking into account the effect of non-equivalent intervalley scattering in addition to that of intravalley acoustic, optical and equivalent intervalley phonon scattering. The analysis has been made on the assumption of a field-dependent displaced Maxwellian distribution function for the electrons in the 〈111〉 valleys and field-independent mobility for the electrons in the 〈100〉 valleys. The calculated values are found to agree with the results of Monte Carlo calculations to within 10 per cent. It is also found that the calculated characteristic agrees with experiments very closely if the values of the deformation potential constant for the intravalley optical phonon scattering and for the nonequivalent intervalley scattering are taken to be 0·5×109 and 0·5×108 eV cm-1, respectively. The non-equivalent intervalley scattering introduces saturation in the velocity-field characteristics and at the same time reduces the temperature of the electrons in the 〈111〉 valleys sufficiently to eliminate the possibility of breakdown. © 1971.

Journal	physica status solidi (b)
Publisher	-
ISSN	0370-1972