Electrical and terahertz magnetospectroscopy studies of laser-patterned micro- and nanostructures on InAs-based heterostructures
- Novel Materials Group, Institut für Physik, Humboldt-Universität zu Berlin, 12489 Berlin (Germany)
- Institut für Angewandte Physik, Universität Hamburg, 20148 Hamburg (Germany)
- Department of Physics, University at Buffalo, The State University of New York, Buffalo, New York 14260 (United States)
Nanostructures fabricated from narrow-gap semiconductors with strong spin-orbit interaction (SOI), such as InAs, can be used to filter momentum modes of electrons and offer the possibility to create and detect spin-polarized currents entirely by electric fields. Here, we present magnetotransport and THz magnetospectroscopy investigations of Hall-bars with back-gates made from in InGaAs/InAlAs quantum well structures with a strained 4 nm InAs-inserted channel. The two-dimensional electron gas is at 53 nm depth and has a carrier density of about 6 × 10{sup 11 }cm{sup −2} and mobility of about 2 × 10{sup 5} cm{sup 2}/Vs, after illumination. Electrical and THz optical transport measurements at low temperatures and in high magnetic fields reveal an effective mass of 0.038m{sub 0} and an anisotropic g-factor of up to 20, larger than for bulk InAs or InAs-based heterostructures. We demonstrate that quasi-one-dimensional channels can be formed by micro-laser lithography. The population of subbands is controlled by in-plane gates. Contrary to previous reports, symmetric and asymmetric in-plane gate voltages applied to quasi-one dimensional channels did not show indications of SOI-induced anomalies in the conductance.
- OSTI ID:
- 22420249
- Journal Information:
- Applied Physics Letters, Vol. 106, Issue 5; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
Similar Records
Maximum drift velocity of electrons in selectively doped InAlAs/InGaAs/InAlAs heterostructures with InAs inserts
Helicity sensitive terahertz radiation detection by dual-grating-gate high electron mobility transistors
Related Subjects
GENERAL PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CARRIER DENSITY
ELECTRIC FIELDS
ELECTRON GAS
GALLIUM ARSENIDES
INDIUM ARSENIDES
LASERS
L-S COUPLING
QUANTUM WELLS
SEMICONDUCTOR MATERIALS
SPECTROSCOPY
SPIN ORIENTATION
THZ RANGE
TWO-DIMENSIONAL SYSTEMS