30 research outputs found
A physical limitation of the Wigner "distribution" function in transport
We present an example revealing that the sign of the "momentum" of the
Wigner "distribution" function is not necessarily associated with the
direction of motion in the real world. This aspect, which is not related to the
well known limitation of the Wigner function that traces back to the
Heisenberg's uncertainty principle, is particularly relevant in transport
studies, wherein it is helpful to distinguish between electrons flowing from
electrodes into devices and vice versa
Reply to Comment on "Critical analysis of a variational method used to describe molecular electron transport"
We show that the failure of the Delaney-Greer (DG) variational ansatz for
transport demonstrated by us in Phys.\ Rev.\ B {\bf 80}, 165301 (2009) (I) is
not related to an unsuitable constraint that prevents a broken time-reversal
symmetry or to real orbitals, as DG incorrectly claim. The complex orbitals
suggested by them as a way-out solution merely represent a particular case of
the general case considered by us in I, which do not in the least affect our
conclusion.Comment: Manuscript as submitted to Phys. Rev. B on 30 November 2010. Sections
VII, VIII, and IX present significant details, which enlarge the analysis of
the published versio
Applying the extended molecule approach to correlated electron transport: important insight from model calculations
Theoretical approaches of electronic transport in correlated molecules
usually consider an extended molecule, which includes, in addition to the
molecule itself, parts of electrodes. In the case where electron correlations
remain confined within the molecule, and the extended molecule is sufficiently
large, the current can be expressed by means of Laudauer-type formulae.
Electron correlations are embodied into the retarded Green function of a
sufficiently large but isolated extended molecule, which represents the key
quantity that can be accurately determined by means of ab initio quantum
chemical calculations. To exemplify these ideas, we present and analyze
numerical results obtained within full CI calculations for an extended molecule
described by the interacting resonant level model. Based on them, we argue that
for organic electrodes the transport properties can be reliably computed,
because the extended molecule can be chosen sufficiently small to be tackled
within accurate ab initio methods. For metallic electrodes, larger extended
molecules have to be considered in general, but a (semi-)quantitative
description of the transport should still be possible particularly in the
typical cases where electron transport proceeds by off-resonant tunneling. Our
numerical results also demonstrate that, contrary to the usual claim, the ratio
between the characteristic Coulomb strength and the level width due to
molecule-electrode coupling is not the only quantity needed to assess whether
electron correlation effects are strong or weak
On a method to calculate conductance by means of the Wigner function: two critical tests
We have implemented the linear response approximation of a method proposed to
compute the electron transport through correlated molecules based on the
time-independent Wigner function [P. Delaney and J. C. Greer, \prl {\bf 93},
36805 (2004)]. The results thus obtained for the zero-bias conductance through
quantum dot both without and with correlations demonstrate that this method is
either quantitatively nor qualitatively able to provide a correct physical
escription of the electric transport through nanosystems. We present an
analysis indicating that the failure is due to the manner of imposing the
boundary conditions, and that it cannot be simply remedied.Comment: 22 pages, 7 figur
Estimating the Number of Molecules in Molecular Junctions Merely Based on the Low Bias Tunneling Conductance at Variable Temperature
Temperature (T) dependent conductance G=G(T) data measured in molecular junctions are routinely taken as evidence for a two-step hopping mechanism. The present paper emphasizes that this is not necessarily the case. A curve of lnG versus 1/T decreasing almost linearly (Arrhenius-like regime) and eventually switching to a nearly horizontal plateau (Sommerfeld regime), or possessing a slope gradually decreasing with increasing 1/T is fully compatible with a single-step tunneling mechanism. The results for the dependence of G on T presented include both analytical exact and accurate approximate formulas and numerical simulations. These theoretical results are general, also in the sense that they are not limited, e.g., to the (single molecule electromigrated (SET) or large area EGaIn) fabrication platforms, which are chosen for exemplification merely in view of the available experimental data needed for analysis. To be specific, we examine in detail transport measurements for molecular junctions based on ferrocene (Fc). As a particularly important finding, we show how the present analytic formulas for G=G(T) can be utilized to compute the ratio f=Aeff/An between the effective and nominal areas of large area Fc-based junctions with an EGaIn top electrode. Our estimate of f≈0.6×10−4 is comparable with previously reported values based on completely different methods for related large area molecular junctions
HCnH− Anion Chains with n ≤ 8 Are Nonlinear and Their Permanent Dipole Makes Them Potential Candidates for Astronomical Observation
To be detectable in space via radio astronomy, molecules should have a permanent dipole moment. This is the plausible reason why HCnH chains are underproportionally represented in the interstellar medium in comparison with the isoelectronically equivalent HCnN chain family, which is the most numerous homologous series astronomically observed so far. In this communication, we present results of quantum chemical calculations for the HCnH family at several levels of theory: density functional theory (DFT/B3LYP), coupled-cluster expansions (ROCCSD(T)), and G4 composite model. Contradicting previous studies, we report here that linear HCnH− anion chains with sizes of astrochemical interest are unstable (i.e., not all calculated frequencies are real). Nonlinear cis and trans HCnH− anion chains turn out to be stable both against molecular vibrations (i.e., all vibrational frequencies are real) and against electron detachment (i.e., positive electroaffinity). The fact that the cis anion conformers possess permanent dipole is the main encouraging message that this study is aiming at conveying to the astrochemical community, as this makes them observable by means of radio astronomy
Extending the Newns-Anderson model to allow nanotransport studies through molecules with floppy degrees of freedom
The Newns-Anderson model is ubiquitous in studies of the molecular transport in the presence of solvent (outer) reorganization. The present work demonstrates that intramolecular reorganization can also be significant for the transport through molecules with floppy degrees of freedom, for which the Newns-Anderson model can be extended. The expressions of the model parameters deduced from electronic structure calculations for (4, 4')-bipyridine (44BPY) quantitatively differ from those characteristic for outer reorganization due to strong intramolecular anharmonicities. These expressions can be utilized as input in transport calculations for 44BPY-based molecular junctions of experimental interest (X