Kavli Affiliate: Grace Xing | Summary:We report the observation of Shubnikov-de Haas (SdH) oscillations in coherently strained, low-dislocation AlN/GaN/AlN quantum wells (QWs), including both undoped and $δ$-doped structures. SdH measurements reveal a single subband occupation in the undoped GaN QW and two subband occupation in the $δ$-doped GaN QW. More importantly, SdH oscillations enable direct measurement of critical two-dimensional electron gas (2DEG) parameters at the Fermi level: carrier density and ground state energy level, electron effective mass ($m^* approx 0.289,m_rm e$ for undoped GaN QW and $m^* approx 0.298,m_rm e$ for $δ$-doped GaN QW), and quantum scattering time ($τ_rm q approx 83.4 , textfs$ for undoped GaN QW and $τ_rm q approx 130.6 , textfs$ for $δ$-doped GaN QW). These findings provide important insights into the fundamental properties of 2DEGs that are strongly quantum confined in the thin GaN QWs, essential for designing nitride heterostructures for high-performance electronic applications. | Search Query: arXiv Query: search_query=au:”Xing Huili Grace”&id_list=&start=0&max_results=10Read More