Extended states in disordered systems: Role of off-diagonal correlations

Zhang, Wei; Ulloa, Sergio E.

doi:10.1103/physrevb.69.153203

Cited by 53 publications

(48 citation statements)

References 18 publications

(18 reference statements)

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“…two electronic bands separated by a gap, is against the influence of several factors which are known to play an important role in controlling charge propagation in DNA molecules, such as static and dynamic disorder 47,48,49,50,51,52,53 and environment.…”

Section: 2223mentioning

confidence: 99%

Dissipative effects in the electronic transport through DNA molecular wires

2005

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We investigate the influence of a dissipative environment which effectively comprises the effects of counterions and hydration shells, on the transport properties of short DNA wires. Their electronic structure is captured by a tight-binding model which is embedded in a bath consisting of a collection of harmonic oscillators. Without coupling to the bath a temperature independent gap opens in the electronic spectrum. Upon allowing for electron-bath interaction the gap becomes temperature dependent. It increases with temperature in the weak-coupling limit to the bath degrees of freedom. In the strong-coupling regime a bath-induced pseudo-gap is formed. As a result, a crossover from tunneling to activated behavior in the low-voltage region of the I-V characteristics is observed with increasing temperature. The temperature dependence of the transmission near the Fermi energy, t(EF), manifests an Arrhenius-like behavior in agreement with recent transport experiments. Moreover, t(EF) shows a weak exponential dependence on the wire length, typical of strong incoherent transport. Disorder effects smear the electronic bands, but do not appreciably affect the pseudo-gap formation.

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Section: 2223mentioning

confidence: 99%

Dissipative effects in the electronic transport through DNA molecular wires

2005

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“…The influence of disorder for (3) has been investigated in Ref. [85]. Contact effects were studied by Ref.…”

Section: Tight-binding Model Approachesmentioning

confidence: 99%

“…For a DNA chain consisting of AT and GC pairs, Ref. [85] investigates structural and dynamical disorder. Here, in addition to the onsite energies in (3), also the hopping elements t i are chosen according to the specific DNA sequence, which itself, however, consists of random sequences of A,T,G,C nucleotides.…”

Section: Tight-binding Model Approachesmentioning

confidence: 99%

Tight-Binding Modeling of Charge Migration in DNA Devices

Cuniberti

Maciá

Rodríguez³

et al. 2007

Charge Migration in DNA

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“…The last example has gained momentum and aroused interest recently after the development of the idea of light localization using path-entangled photons [10] and the tailoring of partially coherent light [11]. The variants of the phenomenon, beginning with the concept of geometrically correlated disorder in the distribution of the potentials, the so called random dimer model (RDM) [12], or in the overlap integrals in a tight binding description [13], and moving over to the engineering of continuous bands of extended Bloch-like functions [14][15][16][17][18] in quasi one dimensional disordered or quasiperiodic systems, thus offer exciting physics and the prospects of designing novel devices.…”

Section: Introductionmentioning

confidence: 99%

Controlled delocalization of electronic states in a multi-strand quasiperiodic lattice

2017

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Finite strips, composed of a periodic stacking of infinite quasiperiodic Fibonacci chains, have been investigated in terms of their electronic properties. The system is described by a tight binding Hamiltonian. The eigenvalue spectrum of such a multi-strand quasiperiodic network is found to be sensitive on the mutual values of the intra-strand and inter-strand tunnel hoppings, whose distribution displays a unique three-subband self-similar pattern in a parameter subspace. In addition, it is observed that special numerical correlations between the nearest and the next-nearest neighbor hopping integrals can render a substantial part of the energy spectrum absolutely continuous. Extended, Bloch like functions populate the above continuous zones, signalling a complete delocalization of single particle states even in such a non-translationally invariant system, and more importantly, a phenomenon that can be engineered by tuning the relative strengths of the hopping parameters. A commutation relation between the potential and the hopping matrices enables us to work out the precise correlation which helps to engineer the extended eigenfunctions and determine the band positions at will.

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Extended states in disordered systems: Role of off-diagonal correlations

Cited by 53 publications

References 18 publications

Dissipative effects in the electronic transport through DNA molecular wires

Dissipative effects in the electronic transport through DNA molecular wires

Tight-Binding Modeling of Charge Migration in DNA Devices

Controlled delocalization of electronic states in a multi-strand quasiperiodic lattice

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