Tunneling effects and intersubband absorption in AlN/GaN superlattices

Baumann, E.; Giorgetta, F. R.; Hofstetter, D.; Wu, H.; Schaff, W. J.; Eastman, L. F.; Kirste, L.
January 2005
Applied Physics Letters;1/17/2005, Vol. 86 Issue 3, p032110
Academic Journal
We report on intersubband absorption and photovoltage measurements on regular GaN/AlN-based superlattice structures. For barrier thicknesses larger than about 25 Ã…, the optical intersubband absorption peaks at a considerably smaller energy than the photovoltage spectrum. A simple model taking into account the oscillator strength of the involved transitions and the corresponding tunneling probabilities agrees with the experimental findings. According to this model, the observed photovoltage is the macroscopic manifestation that the two-dimensional electron gas at the top of the superlattice changes its carrier density by a vertical transport of electrons.


Related Articles

  • Spin waves on the surface of a semiconductor nanotube with a superlattice. Ermolaev, A. M.; Rashba, G. I.; Solyanik, M. A. // Low Temperature Physics;Oct2012, Vol. 38 Issue 10, p957 

    Landau-Silin spin waves spectra on the surface of a cylindrical semiconductor nanotube with a superlattice were studied. The energy spectrum of the tube was derived within the framework of short-range electron interaction model in Hartree-Fock approximation. The components of the tensor of...

  • HgTe-CdTe superlattices: Experimental and theoretical curves of band gap versus HgTe layer thickness. Reno, J.; Sou, I. K.; Faurie, J. P.; Berroir, J. M.; Guldner, Y.; Vieren, J. P. // Applied Physics Letters;7/14/1986, Vol. 49 Issue 2, p106 

    An experimental curve of room-temperature band gap versus HgTe layer thickness for HgTe-CdTe superlattices is presented for the first time. The room-temperature experimental results are compared to theoretical results determined using the envelope function approximation. Also a few values of the...

  • Highly anharmonic potential modulation in lateral superlattices fabricated using epitaxial InGaAs stressors. Luyken, R. J.; Lorke, A.; Song, A. M.; Streibl, M.; Kotthaus, J. P.; Kadow, C.; English, J. H.; Gossard, A. C. // Applied Physics Letters;8/24/1998, Vol. 73 Issue 8 

    A coherently strained stressor structure is used to create a one-dimensional periodic potential in the two-dimensional electron gas at a AlGaAs/GaAs heterointerface. We demonstrate that from magnetotransport the Fourier coefficients of the conduction band modulation can be determined. In...

  • Tunable conductivity at LaAlO3/SrxCa1-xTiO3 (0 ≤ x ≤ 1) heterointerfaces. Young Moon, Seon; Kim, Dai-Hong; Jung Chang, Hye; Kwon Choi, Jong; Kang, Chong-Yun; Jin Choi, Heon; Hong, Seong-Hyeon; Baek, Seung-Hyub; Kim, Jin-Sang; Won Jang, Ho // Applied Physics Letters;1/7/2013, Vol. 102 Issue 1, p012903 

    The two-dimensional electron gas formed at LaAlO3/SrTiO3 heterointerfaces exhibits a variety of interesting physical properties. Herein, we report on tunable conductivity at LaAlO3/SrxCa1-xTiO3 heterostructures. By changing the Sr content in the SrxCa1-xTiO3 (0 ≤ x ≤ 1) layers, the...

  • Novel absorption line shape induced by Tamm states in a finite-length GaAs/AlGaAs superlattice. Yu, Roger H. // Applied Physics Letters;9/19/1994, Vol. 65 Issue 12, p1531 

    Analyzes the ground-state property of a modulation-doped finite gallium-arsenic/aluminum-gallium-arsenic superlattice. Calculation for the absorption spectrum; Characteristics of the spectrum for noninteracting tunneling electron gas; Analysis on the depolarization effect on the Tamm states and...

  • Guiding-center-drift resonance of two-dimensional electrons in a grid-gate superlattice potential. Liu, C.T.; Tsui, D.C.; Shayegan, M.; Ismail, K.; Antoniadis, D.A.; Smith, Henry I. // Applied Physics Letters;6/24/1991, Vol. 58 Issue 25, p2945 

    Studies the low-field magnetoresistance of the two-dimensional electron gas in GaAs/Al[sub x]Ga[sub 1-x]As in the presence of a two-dimensional lateral surface superlattice potential. Observation of the guiding-center drift resonance.

  • Anisotropic piezoelectric effect in lateral surface superlattices. Skuras, E.; Long, A.R. // Applied Physics Letters;2/17/1997, Vol. 70 Issue 7, p871 

    Investigates the anisotropic piezoelectric effect in lateral surface superlattices. Ways of inducing a periodic potential in a two-dimensional electron gas; Components of the piezoelectric effect; Methods used to deduce the periodic potentials seen by the electrons underneath the superlattice.

  • Spatially resolved in situ measurements of the transport of organic molecules in a polycrystalline nanoporous membrane. Weontae Oh; Nair, Sankar // Applied Physics Letters;10/10/2005, Vol. 87 Issue 15, p151912 

    We report spatially resolved, quantitative, in situ, nondestructive measurements of the transport of organic molecules through a polycrystalline, anisotropic, nanoporous molecular sieve membrane, with micron-scale resolution. A method based on photoacoustic spectroscopy experiments during...

  • Cascaded frequency doubling and electro-optic coupling in a single optical superlattice. Huang, C.-P.; Wang, Q.-J.; Zhu, Y.-Y. // Applied Physics B: Lasers & Optics;May2005, Vol. 80 Issue 6, p741 

    Frequency doubling and electro-optic (EO) coupling are cascaded in a single optical superlattice due to simultaneous modulation of nonlinear and EO coefficients. The coupling equations are deduced and analyzed, and simulations in both periodic and quasi-periodic structures are presented. The...


Read the Article


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

Try another library?
Sign out of this library

Other Topics