Transport properties of two-dimensional electron gas in different subbands in triangular quantum wells at Al[sub x]Ga[sub 1-x]N/GaN heterointerfaces

Zheng, Z. W.; Shen, B.; Gui, Y. S.; Jiang, C. P.; Tang, N.; Zhang, R.; Shi, Y.; Zheng, Y. D.; Guo, S. L.; Zheng, G. Z.; Chu, J. H.; Someya, T.; Arakawa, Y.
March 2003
Applied Physics Letters;3/24/2003, Vol. 82 Issue 12, p1872
Academic Journal
Magnetotransport properties of modulation-doped Al[sub 0.22]Ga[sub 0.78]N/GaN heterostructures were investigated by means of magnetoresistance measurements at low temperatures and high magnetic fields. Strong Shubnikov-de Haas oscillations with the double periodicity are observed. The mobility spectrum is obtained, which demonstrates that the mobilities of the two-dimensional electron gas (2DEG) in the two subbands in the triangular quantum well at heterointerface. It is found that the mobility of the 2DEG in the second subband is much higher than that in the first one. This is explained that interface roughness scattering and alloy disorder scattering have much stronger influence on transport properties of the 2DEG in the first subband than that in the second subband in Al[sub x]Ga[sub 1-x]N/GaN heterostructures.


Related Articles

  • The cyclotron resonance in Heterostructures with the InSb/AlInSb quantum wells. Vasilyev, Yu.; Gouider, F.; Nachtwei, G.; Buckle, P. // Semiconductors;Nov2010, Vol. 44 Issue 11, p1511 

    The absorption of two-dimensional electrons in InSb-based quantum wells in the quantized magnetic fields in the terahertz spectral region are studied. A p-Ge-based cyclotron laser was used as the radiation source. The effective mass of carriers at the Fermi level equal to 0.0219 m ( m is the...

  • Weak anti-localization of the two-dimensional electron gas in modulation-doped AlxGa1-xN/GaN heterostructures with two subbands occupation. Lu, J.; Shen, B.; Tang, N.; Chen, D. J.; Zhao, H.; Liu, D. W.; Zhang, R.; Shi, Y.; Zheng, Y. D.; Qiu, Z. J.; Gui, Y. S.; Zhu, B.; Yao, W.; Chu, J. H.; Hoshino, K.; Arakawa, Y. // Applied Physics Letters;10/11/2004, Vol. 85 Issue 15, p3125 

    Weak anti-localization of the two-dimensional electron gas (2DEG) in a modulation-doped Al0.22Ga0.78N/GaN single heterostructure has been investigated through magnetoresistance measurements at low temperatures. The elastic scattering time Ï„e, dephasing time Ï„[lowercase_phi_synonym] and...

  • InAs quantum well Hall devices for room-temperature detection of single magnetic biomolecular labels. Mihajlovic, Goran; Xiong, Peng; von Molnár, Stephan; Field, Mark; Sullivan, Gerard J. // Journal of Applied Physics;8/1/2007, Vol. 102 Issue 3, p034506 

    Hall sensors with cross width of ∼1 μm were fabricated from InAs/AlSb quantum well semiconductor heterostructures containing two-dimensional electron gas. The room-temperature device characteristics were examined by Hall effect and electronic noise measurements along with analytical...

  • Interband Transitions In Modulation-doped GaAs/AlGaAs Heterostructures Under In-plane Magnetic Field. Ashkinadze, B. M.; Linder, E.; Cohen, E.; Pfeiffer, L. N. // AIP Conference Proceedings;2005, Vol. 772 Issue 1, p415 

    The photoluminescence (PL) spectrum of modulation-doped GaAs/AlGaAs quantum wells (MDQW) and heterojunctions (HJ) is studied under a magnetic field Bi, applied parallel to the two-dimensional electron gas (2DEG) layer. The effect of Bi strongly depends on the electron-hole separation deh, and we...

  • Effects of electron-beam-assisted dry etching on optical and electrical properties. Watanabe, Heiji; Ochiai, Yukinori // Applied Physics Letters;9/13/1993, Vol. 63 Issue 11, p1516 

    Examines the effects of electron-beam-assisted dry etching on the optical and electrical properties of quantum wells (QW) and electron gas heterostructures. Comparison between plasma etching and ion-beam-assisted etching; Use of chlorine and SF[sub 6] gases for fabrication of the devices;...

  • Phonon-drag thermopower in semiconducting quantum well structures in a quantizing magnetic field. Sankeshwar, N. S.; Kubakaddi, S. S.; Mulimani, B. G.; Butcher, P. N. // Journal of Applied Physics;12/1/1990, Vol. 68 Issue 11, p5919 

    Features a study that presented a theory of phonon-drag thermopower of a quasi-two-dimensional (Q2D) electron gas in quantum well semiconductor heterostructures in the presence of a quantizing magnetic field. Factor that stimulated interest in confined electron systems realized in semiconductor...

  • Features of quantum effects in two-dimensional GaAs/n-InGaAs/GaAs structures with double quantum wells. Arapov, Yu. G.; Yakunin, M. V.; Gudina, S. V.; Karskanov, I. V.; Neverov, V. N.; Harus, G. I.; Shelushinina, N. G.; Podgornykh, S. M.; Zvonkov, V. N.; Uskova, E. A. // Low Temperature Physics;Feb2007, Vol. 33 Issue 2/3, p156 

    In an n-InxGa1-xAs/GaAs double quantum well (x≈0.2) the temperature dependence of the longitudinal resistance ρxx(T) of a 2D electron gas with low mobility and with an electron density close to the B=0 metal–insulator transition is of an “insulator” character in the...

  • Negative Magnetoresistance of a High-Mobility Two-Dimensional Electron Gas in a Nonlinear Regime. Bykov, A. A.; Kalagin, A. K.; Bakarov, A. K. // JETP Letters;4/25/2005, Vol. 81 Issue 8, p406 

    The effect of the measuring current Idc on the magnetoresistance (MR) of a high-mobility two-dimensional electron gas (2DEG) in a GaAs quantum well with AlAs/GaAs superlattice barriers has been studied. It has been found that, as Idc increases, the MR of the 2DEG in the studied structures...

  • Microwave photoresistance in a two-dimensional electron system with anisotropic mobility. Bykov, A. A.; Islamov, D. R.; Goran, A. V.; Bakarov, A. K. // JETP Letters;Feb2008, Vol. 86 Issue 12, p779 

    The effect of microwave radiation on magnetotransport in single GaAs quantum wells with anisotropic mobility, whose maximum corresponds to the $$[1\bar 10]$$ direction and minimum to the [110] direction, is investigated using the Van der Pauw method. In samples shaped as squares with sides...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics