Compensation mechanisms in low-temperature-grown Ga[sub 1-x]Mn[sub x]As investigated by scanning tunneling spectroscopy

Mahieu, G.; Condette, P.; Grandidier, B.; Nys, J. P.; Allan, G.; Stiévenard, D.; Ebert, Ph.; Shimizu, H.; Tanaka, M.
February 2003
Applied Physics Letters;2/3/2003, Vol. 82 Issue 5, p712
Academic Journal
Ga[sub 1-x]Mn[sub x]As layers with Mn composition of up to 6.2% are investigated by cross-sectional scanning tunneling microscopy and spectroscopy. We identify in the tunneling spectra contributions from Mn[sup -, sub Ga] acceptor states, compensating As[sup 2+, sub Ga] donor states, and additional compensating donor states, which we suggest to be Mn[sup 2+, sub i] interstitials. On basis of the observed Fermi level shift and a charge carrier compensation analysis, we deduce the concentration of Mn[sup 2+, sub i] interstitials. Furthermore, scanning tunneling microscopy images suggest an inhomogeneous distribution of Mn dopant atoms.


Related Articles

  • Cryogenic scanning tunneling microscope with a magnetic coarse approach. Davydov, D. N.; Deltour, R.; Horii, N.; Timofeev, V. A.; Grokholski, A. S. // Review of Scientific Instruments;Nov93, Vol. 64 Issue 11, p3153 

    A compact, rigid, and reliable cryogenic scanning tunneling microscope (CSTM) with a vertical electromagnetic coarse approach system was developed. This device can be used for topographic and local tunneling spectroscopy studies at liquid nitrogen and helium temperatures. Minimal step sizes of...

  • The Scanning Tunneling Microscopy and Scanning Tunneling Spectroscopy of Amorphous Carbon. Ivanov-Omskii, V. I.; Lodygin, A. B.; Yastrebov, S. G. // Semiconductors;Dec2000, Vol. 34 Issue 12, p1355 

    The most important methods for studying the surface of amorphous diamond-like carbon are scanning tunneling microscopy and scanning tunneling spectroscopy. In this review, publications concerned with studying the topography and electronic properties of the surface of amorphous diamond-like...

  • A flexible implementation of scanning tunneling spectroscopy utilizing C-language on the personal computer. Rong, Z. Y.; Chang, A.; Wolf, E. L. // Review of Scientific Instruments;Jul1992, Vol. 63 Issue 7, p3646 

    Scanning tunneling spectroscopy (STS) capable of measuring the local density of states dI/dV=G(V,x,y) correlated with the topography z(x,y) is implemented on a PC/AT computer system. An algorithm using dimensional decoupling and recursive linking is incorporated in a compact C-language code to...

  • Scanning tunneling microscope imaging technique for weakly bonded surface deposits. Jericho, M. H.; Blackford, B. L.; Dahn, D. C. // Journal of Applied Physics;6/15/1989, Vol. 65 Issue 12, p5237 

    Presents a study which described an imaging mode for a scanning tunneling microscope in which tunneling needle is periodically withdrawn from the surface under study in order to reduce the elastic interaction effects between needle and substrate during imaging. Examples of images of weakly...

  • Nanofabrication with a scanning tunneling microscope. Yau, S.-T.; Saltz, D.; Wriekat, A.; Nayfeh, M. H. // Journal of Applied Physics;3/1/1991, Vol. 69 Issue 5, p2970 

    Presents a study which fabricated nanometer-scale structures on graphic surfaces using a scanning tunneling microscope in the presence trimethylaluminum. Details of the voltage threshold; Features of the fabrication process as a function of the tip-surface biasing voltage and the tunneling...

  • In-gap density of states in hole- and electron-doped CuO[sub 2] planes probed by scanning tunneling spectroscopy. Matsumoto, T.; Kawai, T. // Applied Physics A: Materials Science & Processing;1999, Vol. 68 Issue 6, p687 

    Abstract. The low-energy electronic structure of a c-axis Sr[sub x]A[sub y]CuO[sub 2] (A is alkaline earth cation, x+y ≤ 1, hole-and electron-doped infinite layer) thin film, grown by laser-molecular-beam epitaxy on a SrTiO[sub 3] (001) substrate, has been studied using ultrahigh-vacuum...

  • The refrigerator based very low temperature scanning tunneling microscope Pan, S.H.; Pan, S. H.; Hudson, E.W.; Hudson, E. W.; Davis, J.C.; Davis, J. C. // Review of Scientific Instruments;Feb1999, Vol. 70 Issue 2, p1459 

    Describes the design and development of a scanning tunneling microscope which can operate at temperatures down to 240 milliKelvin and in magnetic fields up to seven T with high spatial and energy resolution. Instrument design; Operating principle of the refrigerator; Better resolution in...

  • New variable low-temperature scanning tunneling microscope for use in ultrahigh vacuum. Smith, A.R.; Shih, C.K. // Review of Scientific Instruments;Mar95, Vol. 66 Issue 3, p2499 

    Describes the design and characterization of a variable low-temperature scanning tunneling microscope which has been proven to give atomic resolution at specific temperatures and which is also capable of performing experiments at low temperatures. Use of a two-dimensional piezoelectrically...

  • Cryogenic variable temperature ultrahigh vacuum scanning tunneling microscope. Foley, E. T.; Foley, E.T.; Kam, A. F.; Kam, A.F.; Lyding, J. W.; Lyding, J.W. // Review of Scientific Instruments;Sep2000, Vol. 71 Issue 9 

    A cryogenic variable temperature ultrahigh vacuum (UHV) scanning tunneling microscope (STM) has been developed. This design utilizes a novel vibration isolation that provides an active thermal link to the cooling source without the standard tradeoff of compromising mechanical isolation. A welded...


Read the Article


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

Try another library?
Sign out of this library

Other Topics