Analysis of superconducting Sn/Ti contacts to GaAs/AlGaAs heterostructures by electron focusing

J. R. Gao; J. J.B. Kerkhof; M. Verwerft; Peter H.C. Magnée; Bart Jan Van-Wees; Teunis M. Klapwijk; Jeff Th. M. De Hosson

Analysis of superconducting Sn/Ti contacts to GaAs/AlGaAs heterostructures by electron focusing

J. R. Gao, J. J.B. Kerkhof, M. Verwerft, Peter H.C. Magnée, Bart Jan Van-Wees, Teunis M. Klapwijk, Jeff Th. M. De Hosson

Research output › peer-review

Abstract

Tin-based superconducting contacts have been successfully made to GaAs/AlGaAs heterostructures in several groups. To identify whether the superconductor contacts directly with the two-dimensional electron gas (2DEG), we study the electronic properties underneath the contact locally by means of an electron focusing technique in a GaAs/AlGaAs device which consists of a Sn/Ti contact and two quantum point contacts. The observation of classical focusing peaks shows the presence of a 2DEG under the contact. Together with inspection by cross-sectional electron microscopy, we conclude that the superconducting contacts are formed not in the 2DEG but somewhere above the 2DEG.

Original language	English
Pages (from-to)	621-624
Number of pages	4
Journal	Semiconductor Science and Technology
Volume	11
Issue number	4
State	Published - Apr 1996

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering
Materials Chemistry

Cite this

@article{28223b2f113f4400aa02b5ebef108747,

title = "Analysis of superconducting Sn/Ti contacts to GaAs/AlGaAs heterostructures by electron focusing",

abstract = "Tin-based superconducting contacts have been successfully made to GaAs/AlGaAs heterostructures in several groups. To identify whether the superconductor contacts directly with the two-dimensional electron gas (2DEG), we study the electronic properties underneath the contact locally by means of an electron focusing technique in a GaAs/AlGaAs device which consists of a Sn/Ti contact and two quantum point contacts. The observation of classical focusing peaks shows the presence of a 2DEG under the contact. Together with inspection by cross-sectional electron microscopy, we conclude that the superconducting contacts are formed not in the 2DEG but somewhere above the 2DEG.",

author = "Gao, {J. R.} and Kerkhof, {J. J.B.} and M. Verwerft and Magn{\'e}e, {Peter H.C.} and Van-Wees, {Bart Jan} and Klapwijk, {Teunis M.} and {De Hosson}, {Jeff Th. M.}",

year = "1996",

month = apr,

language = "English",

volume = "11",

pages = "621--624",

journal = "Semiconductor Science and Technology",

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TY - JOUR

T1 - Analysis of superconducting Sn/Ti contacts to GaAs/AlGaAs heterostructures by electron focusing

AU - Gao, J. R.

AU - Kerkhof, J. J.B.

AU - Verwerft, M.

AU - Magnée, Peter H.C.

AU - Van-Wees, Bart Jan

AU - Klapwijk, Teunis M.

AU - De Hosson, Jeff Th. M.

PY - 1996/4

Y1 - 1996/4

N2 - Tin-based superconducting contacts have been successfully made to GaAs/AlGaAs heterostructures in several groups. To identify whether the superconductor contacts directly with the two-dimensional electron gas (2DEG), we study the electronic properties underneath the contact locally by means of an electron focusing technique in a GaAs/AlGaAs device which consists of a Sn/Ti contact and two quantum point contacts. The observation of classical focusing peaks shows the presence of a 2DEG under the contact. Together with inspection by cross-sectional electron microscopy, we conclude that the superconducting contacts are formed not in the 2DEG but somewhere above the 2DEG.

AB - Tin-based superconducting contacts have been successfully made to GaAs/AlGaAs heterostructures in several groups. To identify whether the superconductor contacts directly with the two-dimensional electron gas (2DEG), we study the electronic properties underneath the contact locally by means of an electron focusing technique in a GaAs/AlGaAs device which consists of a Sn/Ti contact and two quantum point contacts. The observation of classical focusing peaks shows the presence of a 2DEG under the contact. Together with inspection by cross-sectional electron microscopy, we conclude that the superconducting contacts are formed not in the 2DEG but somewhere above the 2DEG.

UR - http://www.scopus.com/inward/record.url?scp=0030126173&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0030126173

SN - 0268-1242

VL - 11

SP - 621

EP - 624

JO - Semiconductor Science and Technology

JF - Semiconductor Science and Technology

IS - 4

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