On the angular dependence of InP high electron mobility transistors for cryogenic low noise amplifiers in a magnetic field
Journal article, 2019

The InGaAs-InAlAs-InP high electron mobility transistor (InP HEMT) is the preferred active device used in a cryogenic low noise amplifier (LNA) for sensitive detection of microwave signals. We have investigated the angular dependence of the InP HEMT when oriented in a magnetic field at 2 K ambient temperature up to 14 T. A sharp angular dependence as a function of the magnetic field was measured for the output current of the InP HEMT. This was accurately described by a geometrical magnetoresistance expression for all angles and magnetic field strengths. Key device parameters such as transconductance and on-resistance were significantly affected at small angles and magnetic fields. The strong angular dependence of the InP HEMT output current in a magnetic field has important implications for the alignment of cryogenic LNAs in microwave detection experiments involving magnetic fields.
This work was performed in GigaHertz Centre in a joint research project between Chalmers University of Technology, Low Noise Factory AB, Wasa Millimeter Wave AB, Omnisys Instruments AB and RISE Research Institutes of Sweden. We are grateful to Serguei Cherednichenko for valuable assistance in the noise measurements and Niklas Wadefalk for the LNA design.


Isabel Harrysson Rodrigues

GigaHertz Centre

Chalmers, Microtechnology and Nanoscience (MC2), Terahertz and Millimetre Wave Laboratory

David Niepce

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Technology

Arsalan Pourkabirian

Qamcom Research & Technology

Low Noise Factory AB

Giuseppe Moschetti

Low Noise Factory AB

Joel Schleeh

Chalmers, Microtechnology and Nanoscience (MC2), Microwave Electronics

Thilo Bauch

Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics

Jan Grahn

Chalmers, Microtechnology and Nanoscience (MC2), Terahertz and Millimetre Wave Laboratory

GigaHertz Centre

AIP Advances

2158-3226 (ISSN)

Vol. 9 8 085004

Areas of Advance

Nanoscience and Nanotechnology (SO 2010-2017, EI 2018-)

Materials Science

Subject Categories

Atom and Molecular Physics and Optics

Other Physics Topics

Condensed Matter Physics


Nanofabrication Laboratory



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3/4/2021 1