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Electron subbands on InP
A21 277
Surface Science 113 (1982) 277 North-Holland Publishing Company T U N N E L I N G I N T I P P E D Si I N V E R S I O N T . G . M A T H E S O N ** a n d R.J. H I G G I N S
LAYERS *
Physics Department, University of Oregon, Eugene, Oregon 97403, USA Received 8 May 1981; accepted for publication 25 August 1981
278
Surface Science 113 (1982) 278-28 I North-Holland Publishing Company
V A L L E Y S P L I ' I T I N G I N Si I N V E R S I O N K . C . - W O O a n d P.J. S T I L E S
LAYERS *
Department of Physics, Brown University, Providence, Rhode Island 02912, USA Received 13 July 1981 ; accepted for publication 26 August 1981 Recent theoretical work suggests that when one consideres the effect of lineshape broadening, only a small valley splitting is needed to explain the observation of degeneracies other than that predicted by the effective mass theory. We argue that this simple picture is not universally correct and an additional valley splitting mechanism has to be invoked.
282
Surface Science I 13 (1982) 282-286 North-Holland Publishing Company
DETERMINATION OF S U B B A N D P O P U L A T I O N S IN TIPPED MAGNETIC FIELDS M . N E A L O N , S. W H I T M O R E , R . R . B O U K A S S A * a n d R.E. D O E Z E M A
Department of Physics and Astronomy, University of Oklahoma, Norman, Oklahoma 73019, USA Received 13 July 1981 ; accepted for publication 26 August 1981 In a strictly 2D electron gas, the period of the Shubnikov-De Haas oscillations is determined by the magnetic-field component normal to the layer plane. We have studied tipped-field quantum oscillations in an accumulation layer on n-InAs where as many asfour subbands can be populatecl. The observed departures from 2D behavior are in qualitative accord with the Stern-Howard picture and with a recent parallel-field-only transconductance study, We do, however, observe oscillations corresponding to subbands which were expected to have been emptied by the parallel-field component. The 2D modelis used to discuss subband population quantitatively.
Surface Science 113 (1982) 287-189 North-Holland Publishing Company
E L E C T R O N S U B B A N D S O N InP H.C. CHENG
* a n d F. K O C H
Physik-Department, Technische Universitllt Miinchen, D-8046 Garching, Fed, Rep. of Germany Received 10 July 1981; accepted for publication 27 August 1981
287
Surface Science 113 (1982) 277 North-Holland Publishing Company T U N N E L I N G I N T I P P E D Si I N V E R S I O N T . G . M A T H E S O N ** a n d R.J. H I G G I N S
LAYERS *
Physics Department, University of Oregon, Eugene, Oregon 97403, USA Received 8 May 1981; accepted for publication 25 August 1981
278
Surface Science 113 (1982) 278-28 I North-Holland Publishing Company
V A L L E Y S P L I ' I T I N G I N Si I N V E R S I O N K . C . - W O O a n d P.J. S T I L E S
LAYERS *
Department of Physics, Brown University, Providence, Rhode Island 02912, USA Received 13 July 1981 ; accepted for publication 26 August 1981 Recent theoretical work suggests that when one consideres the effect of lineshape broadening, only a small valley splitting is needed to explain the observation of degeneracies other than that predicted by the effective mass theory. We argue that this simple picture is not universally correct and an additional valley splitting mechanism has to be invoked.
282
Surface Science I 13 (1982) 282-286 North-Holland Publishing Company
DETERMINATION OF S U B B A N D P O P U L A T I O N S IN TIPPED MAGNETIC FIELDS M . N E A L O N , S. W H I T M O R E , R . R . B O U K A S S A * a n d R.E. D O E Z E M A
Department of Physics and Astronomy, University of Oklahoma, Norman, Oklahoma 73019, USA Received 13 July 1981 ; accepted for publication 26 August 1981 In a strictly 2D electron gas, the period of the Shubnikov-De Haas oscillations is determined by the magnetic-field component normal to the layer plane. We have studied tipped-field quantum oscillations in an accumulation layer on n-InAs where as many asfour subbands can be populatecl. The observed departures from 2D behavior are in qualitative accord with the Stern-Howard picture and with a recent parallel-field-only transconductance study, We do, however, observe oscillations corresponding to subbands which were expected to have been emptied by the parallel-field component. The 2D modelis used to discuss subband population quantitatively.
Surface Science 113 (1982) 287-189 North-Holland Publishing Company
E L E C T R O N S U B B A N D S O N InP H.C. CHENG
* a n d F. K O C H
Physik-Department, Technische Universitllt Miinchen, D-8046 Garching, Fed, Rep. of Germany Received 10 July 1981; accepted for publication 27 August 1981
287