Enhanced quantum oscillations and scattering effect in quaternary InAlGaN/GaN two-dimensional electron gas
| Autor: | Chiranjit Karmakar, R. K. Kaneriya, Megha Malasi, Shivam Rathod, Devendra Kumar, Sujay Chakravarty, R. B. Upadhyay, Punam Kumar, A. N. Bhattacharya, U. S. Joshi |
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| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | Applied Physics Letters. 122 |
| ISSN: | 1077-3118 0003-6951 |
| DOI: | 10.1063/5.0142605 |
| Popis: | Quantum transport properties of a large bandgap In0.15Al0.79Ga0.06N/GaN quaternary GaN high electron mobility transistor (HEMT) heterostructure are studied at low temperatures up to 2 K. Herein, we report the first evidence of weak localization in a quaternary GaN two-dimensional electron gas (2DEG) system. We observe negative magnetoresistance behavior and extracted dephasing time (τΦ) using a Hikami–Larkin–Nagaoka model at 2.2 K. Linear dependency of dephasing rate with temperature (τΦ−1∝T) is established below 20 K. Furthermore, Shubnikov–de Haas quantum oscillation induced by 2DEG is observed using perpendicular magnetic (B⊥) field strengths up to 14 T. From the temperature-dependent oscillation amplitude, we extracted an effective mass m*≈0.237me. The dominance of small-angle scattering in the 2DEG channel is identified from less than unit ratio (τq/τt≪1) of quantum lifetime (τq) to the Hall transport lifetime (τt). In our study, we have demonstrated that the In0.15Al0.79Ga0.06N/GaN quaternary heterostructure possesses high dephasing time (τΦ=5.4 ps) and larger quantum lifetime (τq=0.102 ps) indicating better suitability and a way forward to high-power–high-frequency GaN HEMT development. |
| Databáze: | OpenAIRE |
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