Fano resonance and persistent current of a quantum ring

Xiong, Yan; Liang, Xian-Ting

doi:10.1016/j.physleta.2004.08.009

Cited by 33 publications

(29 citation statements)

References 15 publications

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“…Therefore, we do not want to repeat this behavior once again, and one can easily follow this effect from the Refs. 31,48,[60][61][62] .…”

Section: • Some Additional Pointsmentioning

confidence: 99%

Externally controlled high degree of spin polarization and spin inversion in a conducting junction: Two new approaches

Patra¹,

Maiti²

2017

Sci Rep

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We propose two new approaches for regulating spin polarization and spin inversion in a conducting junction within a tight-binding framework based on wave-guide theory. The system comprises a magnetic quantum ring with finite modulation in site potential is coupled to two non-magnetic electrodes. Due to close proximity an additional tunneling is established between the electrodes which regulates electronic transmission significantly. At the same time the phase associated with site potential, which can be tuned externally yields controlled transmission probabilities. Our results are valid for a wide range of parameter values which demonstrates the robustness of our proposition. We strongly believe that the proposed model can be realized in the laboratory.

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“…Therefore, we do not want to repeat this behavior once again, and one can easily follow this effect from the Refs. 31,48,[60][61][62] .…”

Section: • Some Additional Pointsmentioning

confidence: 99%

Externally controlled high degree of spin polarization and spin inversion in a conducting junction: Two new approaches

Patra¹,

Maiti²

2017

Sci Rep

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“…For this junction setup the TB Hamiltonian Eq. 2 gets slightly modified with the inclusion of a new sub‐Hamiltonian described as,

true H_{L R} = t_{L R} (a_{- 1}^{†} c_{1} + c_{1}^{†} a_{- 1})

…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

Possible Routes for Efficient Thermo‐Electric Energy Conversion in a Molecular Junction

Chakraborty

Maiti

2019

ChemPhysChem

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In the context of designing an efficient thermoelectric energy‐conversion device at nanoscale level, we suggest several important tuning parameters to enhance the performance of thermoelectric converters. We consider a simple molecular junction, which is always helpful to understand the basic mechanisms in a deeper way, where a benzene molecule is coupled to two external baths having unequal temperatures. The key component responsible for achieving better performance is associated with the asymmetric nature of transmission function, and in the present work, we show that it can be implemented in different ways by regulating the physical parameters involving the system. Employing a tight‐binding framework we calculate electrical and thermal conductances, thermopower, and figure of merit (FOM) by using Landauer integrals, and thoroughly examine the critical roles played by molecule‐to‐lead (ML) interface geometry, magnetic field, chemical substituent group, ML coupling, and the direct coupling between the two leads. Our results show that a reasonably large FOM (≫1) can be obtained and lead to a possibility of regulating the efficiency by selectively tuning the physical parameters. We believe that the present analysis will enhance the understanding of designing efficient thermoelectric devices, and can be verified in a laboratory.

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“…The common quantity that is required to describe transport properties is the transmission function. We evaluate it using wave-guide (WG) theory, a standard technique [40][41][42][43] for calculating transmission probability. One can also use some other prescriptions like transfermatrix formalism or Green's function technique [44][45][46][47][48][49] .…”

Section: B the Methodsmentioning

confidence: 99%