TITLE

Tunneling in presence of coupling to other modes: Application to scanning tunneling microscopy

AUTHOR(S)
Sebastian, K. L.; Doyen, G.
PUB. DATE
November 1993
SOURCE
Journal of Chemical Physics;11/1/1993, Vol. 99 Issue 9, p6677
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Using path integral techniques, we investigate the problem of estimating the tunneling probability in the case where the tunneling particle is coupled to the medium through which it tunnels. We develop methods for estimating the tunneling probability in the cases where (1) the tunneling is elastically and the medium is at zero temperature and (2) the medium is at a finite temperature and the tunneling could happen inelastically. We point out that the second method makes clearer the basis for the approach of Persson and Baratoff [Phys. Rev. B 38, 9616 (1988)], in which they heuristically extended the method of Caldeira and Leggett [Phys. Rev. Lett. 46, 211 (1981)] to account for dynamical image effects in scanning tunneling microscopy. Our analysis, however, brings out a defect of their approach. It leads to an energy loss to the system of plasmons, even when there is no possibility of exciting plasmons, because the tunneling particle does not have enough energy to cause this. Therefore, for this problem, we suggest that one has to make use of a method which has the condition that the tunneling is elastically built into it. We demonstrate how this can be done and find that the dynamical effects are more important than pointed out by Persson and Baratoff. We have also investigated the tunneling of an electron through a liquid in between the electrode and the tip, a situation of great interest in the study of the electrochemical interface. It has been suggested that the solvent might play a dynamical role in the tunneling, leading to a lowering of the barrier height for tunneling. We find that the time spent by the electron inside the liquid is much shorter than the time needed for the orientational polarization of the liquid to respond. Consequently, the tunneling has to be thought of as occurring through a random distribution of stationary solvent molecules. The randomness leads to an enhancement of the tunneling probability, due to which the tunneling current...
ACCESSION #
7619653

 

Related Articles

  • A tunneling instrument for angle resolved tunneling spectroscopy. Suzuki, M.; Fujii, T.; Miyashita, M.; Onuki, T.; Enomoto, H.; Ozaki, H. // Review of Scientific Instruments;Oct91, Vol. 62 Issue 10, p2424 

    A new tunneling instrument has been developed to observe the anisotropy of the Fermi surface. This instrument has two advantageous mechanisms over the conventional scanning tunneling microscope (STM); a tilt mechanism to keep two crystals parallel to each other and a rotation mechanism of the...

  • Tunnel Effect With Moving Tunnel. Kiritani, Yoshie // Psychology Research;Oct2011, Vol. 1 Issue 4, p255 

    Tunnel effect is a perception of continuous but hidden movement under a screen. The present study confirmed the optimal interval of occlusion to see the effect, when both a moving object and the screen move together. Firstly, four criteria were confirmed to check the tunnel effect in the...

  • Heating-compensated constant-temperature tunneling measurements on stacks of Bi2Sr2CaCu2O8+x intrinsic junctions. Myung-Ho Bae; Jae-Hyun Choi; Hu-Jong Lee // Applied Physics Letters;6/6/2005, Vol. 86 Issue 23, p232502 

    In highly anisotropic layered cuprates such as Bi2Sr2CaCu2O8+x tunneling measurements on a stack of intrinsic junctions (IJs) in a high-bias range are often susceptible to self-heating. In this study we monitored the temperature variation of a stack (“sample stack”) of IJs by...

  • Investigation of a Superconducting Mg1 – xAlxB2 System by Tunneling and Microjunction (Andreev) Spectroscopies. Ponomarev, Ya. G.; Kuzmichev, S.A.; Kadomtseva, N.M.; Mikheev, M.G.; Sudakov, M.V.; Chesnokov, S.N.; Maksimov, E.G.; Krasnosvobodtsev, S.I.; Sevast'yanova, L.G.; Burdina, K.P.; Bulychev, B.M. // JETP Letters;5/25/2004, Vol. 79 Issue 10, p484 

    A detailed investigation of multiband superconductivity in the Mg1 – xAlxB2 system was carried out by the methods of tunneling and Andreev spectroscopy. Temperature dependences of the superconducting gaps and their variation upon an increase in the degree of disorder and the Al...

  • Effects of hydration on molecular junction transport. Long, David P.; Lazorcik, Jason L.; Mantooth, Brent A.; Moore, Martin H.; Ratner, Mark A.; Troisi, Alessandro; Yao, Yuxing; Ciszek, Jacob W.; Tour, James M.; Shashidhar, Ranganathan // Nature Materials;Nov2006, Vol. 5 Issue 11, p901 

    The study of charge transport through increasingly complex small molecules will benefit from a detailed understanding of how contaminants from the environment affect molecular conduction. This should provide a clearer picture of the electronic characteristics of molecules by eliminating...

  • Superconductivity mediated by spin fluctuations in the heavy-fermion compound UPd2Al3. Jourdan, M.; Huth, M.; Adrian, H. // Nature;3/4/1999, Vol. 398 Issue 6722, p47 

    Describes an experiment using tunnelling spectroscopy to investigate the superconducting order parameter of a uranium-based heavy-fermion superconductor, epitaxial thin films of UPd2Al3. Observation of a strong-coupling feature in the tunelling conductivity, combined with recent inelastic...

  • Ortho-para mixing interaction in the vinyl radical detected by millimeter-wave spectroscopy. Tanaka, Keiichi; Hayashi, Masato; Ohtsuki, Mitsuhiko; Harada, Kensuke; Tanaka, Takehiko // Journal of Chemical Physics;9/21/2009, Vol. 131 Issue 11, p111101 

    Ortho-para mixing interaction due to the coupling of nuclear and electron spins was detected for the first time by millimeter-wave spectroscopy of the deuterated vinyl radical H2CCD. The ground state of H2CCD is split by the deuteron tunneling into two components 0+ and 0- separated by...

  • Spin-dependent density of states in Ga1-xMnxAs probed by tunneling spectroscopy. Saito, H.; Yamamoto, A.; Yuasa, S.; Ando, K. // Applied Physics Letters;5/12/2008, Vol. 92 Issue 19, p194104 

    We conducted spin-dependent tunneling spectroscopy measurements in Fe/ZnSe/Ga1-xMnxAs magnetic tunnel diodes that had a metal-insulator-semiconductor structure. The tunneling magnetoresistance signal in differential conductance spectra (dI/dV-V) was found to disappear for bias voltages (V)...

  • Inelastic electron tunneling spectroscopy and bias voltage dependence of magnetic tunnel junctions with polycrystalline Co2MnSi electrode. Schmalhorst, J.; Kämmerer, S.; Reiss, G.; Hütten, A. // Applied Physics Letters;1/31/2005, Vol. 86 Issue 5, p052501 

    Spintronics needs half-metallic materials implemented in technologically relevant devices. We prepare Co2MnSi/AlOx/Co7Fe3 junctions showing a tunneling magnetoresistance of 94.6% at 1 mV and 20 K. Their inelastic electron tunneling spectra at 20 K show typical magnon and phonon excitations in...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

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

Try another library?
Sign out of this library

Other Topics