High degree of current rectification at nanoscale level

Saha, Madhumita; Maiti, Santanu K.

doi:10.1016/j.physe.2017.06.023

Cited by 13 publications

(12 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In Ref. [37], we have seen quasi-periodicity plays an important role behind large rectification in a 1D chain. Therefore, to construct the artificial dsDNA molecule, we arrange the bases A and G in the upper strand (i.e., channel-I) following a Fibonacci sequence (quasi-periodic one), and the other strand is automatically designed with the bases T and C (which is also a quasi-periodic sequence) following the WC base-pairing rules [33].…”

Section: A Dna Moleculementioning

confidence: 90%

“…The quasi-periodic potential leads to a gapped and fragmented spectrum [59,60] and breaks the spatial reflection symmetry. It makes quasi-periodicity a key ingredient for occurrence of large particle current rectification [37]. In a recent work [61], strong energy current rectification has been shown in a quadratic bosonic system, subjected to quasi-periodic potential, which is connected to spin baths having differing temperatures.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Particle current rectification in a quasi-periodic double-stranded ladder

Saha¹,

Maiti²

2019

J. Phys. D: Appl. Phys.

Self Cite

View full text Add to dashboard Cite

We report transport properties and particle current rectification operation in a double-stranded tight-binding ladder network within non-equilibrium Green's function (NEGF) formalism that can easily be generalized in multi-stranded systems. First, we explore the rectification operation considering the model of an artificial double-stranded DNA (dsDNA) molecular system with Fibonacci type substitutional sequence. Substitutional sequences form quasi-periodic potentials. This analysis may shed new light in designing efficient nanoscale rectifier. It can also be directly implemented to different biomolecular systems like nucleic acids and most proteins as they follow quasi-periodic orders. Motivated with this fact, we consider different configurations depending on the choices of on-site energies and/or inter or intra strand nearest-neighbor hopping integrals in the form of Aubry-André-Harper (AAH) model (that also obeys quasi-periodic order), and in all the cases we find almost 100% current rectification even at very low bias region. Along with this, we observe that the phase (positive or negative) of rectification can suitably be engineered by tuning the Fermi energy and AAH phase. The effects of electron-electron (e-e) interaction and temperature are also studied, which show that a reasonably large rectification can be observed even for moderate temperature range and e-e interaction strength.arXiv:1812.03776v3 [cond-mat.mes-hall]

show abstract

Section: A Dna Moleculementioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Particle current rectification in a quasi-periodic double-stranded ladder

Saha¹,

Maiti²

2019

J. Phys. D: Appl. Phys.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Quasiperiodic systems have also been shown to offer potential applications in quantum heat management, e.g. as rectifiers [56][57][58] or as highly efficient working media for thermoelectric engines [14]. Here we ask if the inevitable presence of dephasing noise can be used to further engineer their thermal capabilities.…”

Section: Introductionmentioning

confidence: 99%

Dephasing-enhanced performance in quasiperiodic thermal machines

Chiaracane,

Purkayastha,

Mitchison

et al. 2021

Preprint

View full text Add to dashboard Cite

Understanding and controlling quantum transport in low-dimensional systems is pivotal for heat management at the nanoscale. One promising strategy to obtain the desired transport properties is to engineer particular spectral structures. In this work we are interested in quasiperiodic disorder -incommensurate with the underlying periodicity of the lattice -which induces fractality in the energy spectrum. A well known example is the Fibonacci model which, despite being non-interacting, yields anomalous diffusion with a continuously varying dynamical exponent smoothly crossing over from superdiffusive to subdiffusive regime as a function of potential strength. We study the finite-temperature electric and heat transport in this model in the absence and in the presence of dephasing. Dephasing causes both thermal and electric transport to become diffusive, thereby making thermal and electrical conductivities finite in the thermodynamic limit. Thus, in the subdiffusive regime it leads to enhancement of transport. We find that the thermal and electric conductivities have multiple peaks as a function of dephasing strength. Remarkably, we observe that the thermal and electrical conductivities are not proportional to each other, a clear violation of Wiedemann-Franz law, and the position of their maxima can differ. We argue that this feature can be utilized to enhance performance of quantum thermal machines. In particular, we show that by tuning the strength of the dephasing we can enhance the performance of the device in regimes where it acts as an autonomous refrigerator.

show abstract

“…So far, various simple and complex molecular structures have been investigated theoretically for modulat-ing the rectification performance. For instance, molecular wires 4 , complex molecular structure with metallic electrodes 17 , quantum wires with correlated site potentials 22,23 , DNA molecular system with Fibonacci sequence 24 , etc. The rectification behavior has also been tested experimentally for several molecular systems, such as symmetric tetraphenyl and non-symmetric diblock dipyrimidinyldiphenyl molecules 9 , molecular rods 25 , single melamine molecule adsorbed on a Cu(100) surface 26 , etc.…”

Section: Introductionmentioning

confidence: 99%

Enhanced current rectification in graphene nanoribbons: Effects of geometries and orientations of nanopores

Majhi,

Ganguly,

Maiti

2021

Preprint

Self Cite

View full text Add to dashboard Cite

We discuss the possibility of getting rectification operation in graphene nanoribbon (GNR). For a system to be a rectifier, it must be physically asymmetric and we induce the asymmetry in GNR by introducing nanopores. The rectification properties are discussed for differently structured nanopores. We find that shape and orientation of the nanopores are critical and sensitive to the degree of current rectification. As the choice of Fermi energy is crucial for obtaining significant current rectification, explicit dependence of Fermi energy on the degree of current rectification is also studied for a particular shape of the nanopore. Finally, the role of nanopore size and different spatial distributions of the electrostatic potential profile across the GNR are discussed. Given the simplicity of the proposed method and promising results, the present proposition may lead to a new route of getting current rectification in different kinds of materials where nanopores can be formed selectively.

show abstract

High degree of current rectification at nanoscale level

Cited by 13 publications

References 28 publications

Particle current rectification in a quasi-periodic double-stranded ladder

Particle current rectification in a quasi-periodic double-stranded ladder

Dephasing-enhanced performance in quasiperiodic thermal machines

Enhanced current rectification in graphene nanoribbons: Effects of geometries and orientations of nanopores

Contact Info

Product

Resources

About