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Title: Scatterings and Quantum Effects in ( Al , In ) N / GaN Heterostructures for High-Power and High-Frequency Electronics

Journal Article · · Physical Review Applied
 [1];  [2];  [1];  [1];  [1];  [3];  [1]
  1. Univ. of South Carolina, Columbia, SC (United States)
  2. Benedict College, Columbia, SC (United States)
  3. Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)

Charge transport in the wide-band-gap ( Al , In ) N / GaN heterostructures with high carrier density approximately 2 × 10 13 cm - 2 is investigated over a large range of temperature ( 270 mK T 280 K ) and magnetic field ( 0 B 18 T ). We observe the first evidence of weak localization in the two-dimensional electron gas in this system. From the Shubnikov–de Haas (SdH) oscillations a relatively light effective mass of 0.23 m e is determined. Furthermore, the linear dependence with temperature ( T < 20 K ) of the inelastic scattering rate ( τ i - 1 T ) is attributed to the phase breaking by electron-electron scattering. Also in the same temperature range the less-than unit ratio of quantum lifetime to Hall transport time ( τ q / τ t < 1 ) is taken to signify the dominance of small-angle scattering. Above 20 K, with increasing temperature scattering changes from acoustic phonon to optical phonon scattering, resulting in a rapid decrease in carrier mobility and increase in sheet resistance. Furthermore, suppression of such scatterings will lead to higher mobility and a way forward to high-power and high-frequency electronics.

Research Organization:
Florida A & M University, Tallahassee, FL (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF)
Grant/Contract Number:
NA0002630; DMR-1157490
OSTI ID:
1540701
Alternate ID(s):
OSTI ID: 1419829
Journal Information:
Physical Review Applied, Vol. 9, Issue 2; ISSN 2331-7019
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 14 works
Citation information provided by
Web of Science

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Cited By (2)

Quantum transport properties of monolayer graphene with antidot lattice journal August 2019
Planar anisotropic Shubnikov-de-Haas oscillations of two-dimensional electron gas in AlN/GaN heterostructure journal October 2019