One-Dimensional Transport in Polymer Nanofibers

Алешин, А. Н.; Lee, H. J.; Park, Y. W.; Akagi, Kazuo

doi:10.1103/physrevlett.93.196601

Cited by 162 publications

(134 citation statements)

References 26 publications

Supporting

Mentioning

128

Contrasting

Order By: Relevance

“…The existence of two slopes at T > 30 K: namely ζ ~ 1.3 at low biases and ζ ~ 2.1 at high biases, can be attributed to the transition from the 2D tunneling in polymer nanoarray at low temperature to the quasi-1D Luttinger liquid-like transport at higher temperature, described in detail in Ref. 13, where V t ~ 0 and thus the Ohmic regime in I-Vs becomes available. This behavior correlates well with the crossover from Luttinger liquid to Coulomb blockade regime observed in MWNT recently [27,28].…”

mentioning

confidence: 99%

“…In this connection polyacetylene (PA) nanofibers are of particular interest as the model system for nanotransport studies because of the simple chemical structure, well defined polycrystallinity [9], and good ability for doping [10][11][12]. It is shown that at temperature 30 K < T < 300 K doped polymer nanofibers demonstrate some transport features characteristic of quasi-1D systems, namely, series of Luttinger liquids separated by intra molecular barriers [13]. This implies the power-law behavior in both the temperature dependence of the conductance, G(T), and I-V characteristics, I(V) [14].…”

mentioning

confidence: 99%

“…Single R-hel PA fibers with a cross-section, typically 40 -60 nm (high), 100 -300 nm (wide) and the length up to ~ 10 µm, were deposited on a Si substrate with a SiO 2 layer and platinum electrodes thermally evaporated on the top, 2 µm apart. The fiber was doped with iodine from vapor phase up to the saturation level similar to our previous studies [13,19]. The transport measurements were performed in the 2-probe geometry in a vacuum at ~10 -5 Torr, using Janis cryostat with a Keithley 6517A electrometer.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Coulomb-blockade transport in quasi-one-dimensional polymer nanofibers

et al. 2005

Self Cite

View full text Add to dashboard Cite

We report the low temperature current-voltage (I-V) characteristics studies in quasi one-dimensional conducting polymer nanofibers. We find a threshold voltage V t below which little current flows at temperatures below 30 -40 K. For V > V t current scales as (V/V t -1) ζ , where ζ ~ 1.8 -2.1 at high biases. Differential conductance oscillations are observed whose magnitude increases as temperature decreases below 10 K. We attributed the observed low temperature I-V behavior to Coulomb blockade effects with a crossover to Luttinger liquid-like behavior at high temperature. We demonstrate that at low temperatures such a doped conjugated polymer fiber can be considered as an array of small conducting regions separated by nanoscale barriers, where the Coulomb blockade tunneling is the dominant transport mechanism.PACS numbers: 71.30.+h, 72.20.Ee, 72.80.Le Complex structures built of nanosize conducting objects provide model systems for investigation of transport phenomena on the mesoscopic scale, where quantum confinement and Coulomb charging play an important role [1]. Electronic transport through an array of metallic nanocrystals separated by nanobarriers is determined by the interplay between single-electron charging of an individual conducting region and tunneling between adjacent islands. In such systems both the tunneling resistance between neighboring regions is large, R T >> h/e 2 and the charging energy E C = e 2 /2C of an excess electron on a site is larger than k B T (C is the capacitance of the region). In the presence of both charge and structural disorder this interplay leads to highly nonOhmic current-voltage (I-V) characteristics. Coulomb blockade theory predicts that at low temperatures, there is no current below a specific threshold voltage, V t , while above V t the current follows a power law:with ζ ~ 1 in one dimensional (1D) and 5/3 or 2 in twodimensional (2D) systems [2]. V t depends on the nanocrystal number, the capacitance of the conducting regions and the capacitance between the each region and the back gate. Such a behavior with scaling exponents between 1 and 2.3 has been found, for example, in narrow chains of carbon nanoparticles [3], and in 100 nm wide multilayer of gold particles which exhibited ζ ~ 1.6 [4]. Coulomb-blockade effects have also been observed in multiwalled carbon nanotubes [5], organic thin-film transistors based on highly ordered molecular materials [6] as well as in single-molecular transistor structures [7]. It is evident that the nature of the individual regions: metallic, semiconducting, quantum dots -is irrelevant for this phenomenon to be observed [8]. In view of these results the question arises whether Coulomb-blockade effects can also be observed in such inherent quasi-1D systems as conducting polymer nanofibers. In this connection polyacetylene (PA) nanofibers are of particular interest as the model system for nanotransport studies because of the simple chemical structure, well defined polycrystallinity [9], and good ability for doping [10][11][12]. It is...

show abstract

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

Coulomb-blockade transport in quasi-one-dimensional polymer nanofibers

et al. 2005

Self Cite

View full text Add to dashboard Cite

show abstract

“…In recent years, progress in nanofabrication technologies has made it possible to manufacture a variety of single-and few-channel quantum wires connected to the electric leads and to perform systematic transport measurements on the very narrow wires. The latter include single-wall carbon nanotubes 8,9,10,11,12,13,14 , semiconductor-based 15,16,17,18 and metallic 19 quantum wires, polymer nanofibers 20 , as well as quantum Hall edge states. 21,22 The LL nature of these strongly correlated quantum wires has been supported by a wealth of experimental findings.…”

Section: Introductionmentioning

confidence: 99%

“…21,22 The LL nature of these strongly correlated quantum wires has been supported by a wealth of experimental findings. 8,9,10,11,12,13,14,15,16,19,20,21,22 Another class of strongly-correlated quantum wires that has recently attracted a lot of interest is ultracold atomic gases confined to 1D geometry, for review see Ref. 23.…”

Section: Introductionmentioning

confidence: 99%

Quantum interference and spin-charge separation in a disordered Luttinger liquid

et al. 2008

View full text Add to dashboard Cite

We study the influence of spin on the quantum interference of interacting electrons in a singlechannel disordered quantum wire within the framework of the Luttinger liquid (LL) model. The nature of the electron interference in a spinful LL is particularly nontrivial because the elementary bosonic excitations that carry charge and spin propagate with different velocities. We extend the functional bosonization approach to treat the fermionic and bosonic degrees of freedom in a disordered spinful LL on an equal footing. We analyze the effect of spin-charge separation at finite temperature both on the spectral properties of single-particle fermionic excitations and on the conductivity of a disordered quantum wire. We demonstrate that the notion of weak localization, related to the interference of multiple-scattered electron waves and their decoherence due to electron-electron scattering, remains applicable to the spin-charge separated system. The relevant dephasing length, governed by the interplay of electron-electron interaction and spin-charge separation, is found to be parametrically shorter than in a spinless LL. We calculate both the quantum (weak localization) and classical (memory effect) corrections to the conductivity of a disordered spinful LL. The classical correction is shown to dominate in the limit of high temperature.

show abstract