Influence of image force potential on the shot noise properties of field emitters

Rangaswamy, K.; Cahay, M.; Jensen, K. L.
October 2004
Applied Physics Letters;10/25/2004, Vol. 85 Issue 17, p3763
Academic Journal
The shot noise power spectrum of the emission current from planar metallic cathodes is calculated taking into account the effects of the image force potential in front of the cathode. For metals with low work function, the Fano factor which characterizes the reduction of the shot noise power SIem below the Schottky result 2 qIem (where q is the magnitude of the charge of the electron and Iem is the time average of the emitted current) is calculated as a function of the applied external electric field and is found to be reduced substantially below the value calculated when the effects of the image charge potential are neglected. A study of the temperature dependence of the Fano factor can be used to estimate the temperature dependence of the work function of the cathode material.


Related Articles

  • High ambipolar and balanced carrier mobility in regioregular poly(3-hexylthiophene). Choulis, S. A.; Kim, Y.; Nelson, J.; Bradley, D. D. C.; Giles, M.; Shkunov, M.; McCulloch, I. // Applied Physics Letters;10/25/2004, Vol. 85 Issue 17, p3890 

    The carrier transport of carefully purified regioregular poly(3-hexylthiophene) films has been studied using time-of-flight photocurrent measurements. We find balanced ambipolar transport with a room-temperature mobility for holes of 3×10-4 cm2 V-1 s-1 and for electrons of 1.5×10-4 cm2...

  • Selecting a paraxial region profile for the accelerating structure of an electron-positron collider. Bogomolov, Ya. L.; Semenov, E. S.; Yunakovsky, A. D. // Technical Physics Letters;Jul2009, Vol. 35 Issue 7, p597 

    The effect of perturbations in the profile of a paraxial region boundary on the electrodynamic characteristics of the accelerating structure of an electron-positron collider has been studied. In addition to the traditional elliptic profiles, configurations that form an electric field with a...

  • The role of electron heat flux in guide-field magnetic reconnection. Hesse, Michael; Kuznetsova, Masha; Birn, Joachim // Physics of Plasmas;Dec2004, Vol. 11 Issue 12, p5387 

    A combination of analytical theory and particle-in-cell simulations are employed in order to investigate the electron dynamics near and at the site of guide field magnetic reconnection. A detailed analysis of the contributions to the reconnection electric field shows that both bulk inertia and...

  • Amplification of Light during the Scattering of a Relativistic Electron by a Nucleus in a Moderately Strong Field of a Circularly Polarized Light Wave. Roshchupkin, S. P.; Tsybul'nik, V. A. // Journal of Experimental & Theoretical Physics;May2005, Vol. 100 Issue 5, p884 

    The amplification (attenuation) factor of an electromagnetic wave during the scattering of a relativistic electron by a nucleus in a moderately strong field of a circularly polarized electromagnetic wave is studied theoretically. The effect of amplification of an electromagnetic field is...

  • Physical origin of the quadrupole out-of-plane magnetic field in Hall-magnetohydrodynamic reconnection. Uzdensky, Dmitri A.; Kulsrud, Russell M. // Physics of Plasmas;Jun2006, Vol. 13 Issue 6, p062305 

    A quadrupole pattern of the out-of-plane component of the magnetic field inside a reconnection region is seen as an important signature of the Hall-magnetohydrodynamic regime of reconnection. It has been first observed in numerical simulations and just recently confirmed in the Magnetic...

  • Transient-mode multipactor discharge. Graves, T. P.; Spektor, R.; Stout, P.; Axley, A. // Physics of Plasmas;Aug2009, Vol. 16 Issue 8, p083502 

    Multipactor discharge is a resonant condition in which electrons impact material surfaces in phase with an alternating rf or microwave electric field. A growing and/or sustained discharge requires the electrode secondary electron coefficient, δ(Ee), to be greater than unity at the impacting...

  • Negative differential Rashba effect in two-dimensional hole systems. Habib, B.; Tutuc, E.; Melinte, S.; Shayegan, M.; Wasserman, D.; Lyon, S. A.; Winkler, R. // Applied Physics Letters;10/11/2004, Vol. 85 Issue 15, p3151 

    We demonstrate experimentally and theoretically that two-dimensional (2D) heavy-hole systems in single heterostructures exhibit a decrease in spin–orbit interaction-induced spin splitting with an increase in perpendicular electric field. Using front and back gates, we measure the spin...

  • Characterization of multiple Si/SiO2 interfaces in silicon-on-insulator materials via second-harmonic generation. Jun, B.; White, Y. V.; Schrimpf, R. D.; Fleetwood, D. M.; Brunier, F.; Bresson, N.; Cristoloveanu, S.; Tolk, N. H. // Applied Physics Letters;10/11/2004, Vol. 85 Issue 15, p3095 

    Charge generation, transport, and recombination processes in UNIBOND® silicon-on-insulator wafers are studied via an optical second-harmonic generation (SHG) technique. The electric fields at the interfaces vary with time due to charge trapping. The presence of a thin native oxide layer on...

  • A prototype protein field-effect transistor. Yau, Siu-Tung; Qian, Guoguang // Applied Physics Letters;3/7/2005, Vol. 86 Issue 10, p103508 

    Electrical conduction in a macroscopic assembly of apoferritin, a non-redox protein, has been characterized using a three-terminal prototype device. Our result shows an ohmic conduction near zero bias. The ohmic conduction can be controlled using an electric field applied to the protein assembly...


Read the Article


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

Try another library?
Sign out of this library

Other Topics