Abstract
The dependences of magnetoresistance and Hall coefficient on magnetic and electric fields are investigated in epitaxial n-GaAs layers with shallow donor concentration Nd ⪅ 1014 cm−3. Measurements are carried out at 4.5 K in magnetic fields up to 3 T. The investigated samples have S-shaped (current controlled) current-voltage characteristics due to impact ionization of shallow impurities. The relative magnetoresistance scales as ΔQ ∝ exp Bα at weak electric fields, where α = 2.06 ± 0.04 and 0.54 ± 0.02 for weak and strong magnetic fields, respectively, and ΔQ ∝ Bβ close to the breakdown field Ebr, where β = 1.09 ± 0.02. In electric fields above breakdown (E > Ebr) the magnetoresistance is found to be proportional to Bγ with γ = 1.96 ± 0.08. The Hall coefficient decreases for E < Ebr and increases for E > Ebr with increasing magnetic field strength.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
