Theory of rectification in tour wires: the role of electrode coupling.

نویسندگان

  • Jeremy Taylor
  • Mads Brandbyge
  • Kurt Stokbro
چکیده

We report first-principles studies of electronic transport and rectification in molecular wires attached to gold electrodes. Our ab initio calculation gives an accurate description of the voltage drop as well as the broadening and alignment of the molecular levels in the metal-molecule-metal complex. We find that the operation range and rectification in such strongly chemisorbed molecules is limited by the width of the transmission resonances and their proximity to the Fermi level.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Rectification Ratio Enhancement and Functionalized Pyrene: DFT+NEGF

Electron transport properties of pure and Oxygen and/or Methyl substituted pyrene between two semi-infinite Aluminum atomic electrodes have been investigated by means of density functional theory plus the non-equilibrium green’s function method. The electrodes were represented by a slab of Al atoms oriented along the [111] plane. The computations were carried out in the bias voltage range of 0....

متن کامل

Sociological Analyze of Women's Tour Guide Employment constraints on Tourism

Considering the necessity of women employment and the effective role of tourism in increasing job opportunities in this paper, we investigated the constraints provided by this job by using the experiences of women tour guide. The methodology in this study was qualitative and by using the Grounded Theory method. Data were collected by interviews and observations. Sampling method was targeted wit...

متن کامل

Is Molecular Rectification Caused by Asymmetric Electrode Couplings or by a Molecular Bias Drop?

We investigate possible causes of molecular rectification in electrode−molecule− electrode junctions. By using a simple model and simulated conductance histograms, we show that a molecular bias drop is responsible for rectification; conversely, asymmetric molecule−electrode couplings do not directly result in rectification. Instead, the degree of coupling (a)symmetry can be observed in the line...

متن کامل

Asymmetric electron transport realized by decoupling between molecule and electrode.

We studied the contact coupling effect on the asymmetric electron transport in molecular junctions by the first-principles density functional theory incorporating with the non-equilibrium Green's function method. To realize the decoupling, a rigid saturated ring is inserted into the metallic electrode and conjugated molecular bridge (linear oligo phenylene ethynylene and cyclic porphine). As a ...

متن کامل

Molecular junctions in the Coulomb blockade regime: Rectification and nesting

Quantum transport through single molecules is very sensitive to the strength of the molecule-electrode contact. Here, we investigate the behavior of a model molecular junction weakly coupled to external electrodes in the case where charging effects do play an important role Coulomb blockade regime . As a minimal model, we consider a molecular junction with two spatially separated donor and acce...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:
  • Physical review letters

دوره 89 13  شماره 

صفحات  -

تاریخ انتشار 2002