Steady and dynamic magnetic phase transitions in the open interacting quantum dots arrays

Xie, Hang; Cheng, Xingyu; Lü, Xiao-Long

doi:10.1016/j.jmmm.2019.165867

Cited by 2 publications

(2 citation statements)

References 32 publications

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“…By comparing this equation with the equilibrium case, we find that the ratio of the level-width functions for the both leads can tune the electron occupancy of the SL band. 25), we employ the residue theorem to calculate the integral with the Fermi function approximated by the Padé expansion [37].…”

Section: Discussionmentioning

confidence: 99%

Non-equilibrium charge transport in a conjugated polymer

Cheng¹,

Zhao²,

Xie³

2021

J. Phys.: Condens. Matter

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To address the non-equilibrium transport mechanism in a conjugated polymer, we investigate the dynamics of the lattice deformation and the charge transport in a polymer chain coupled with the reservoirs by the time-dependent non-equilibrium Green’s function formulism. We find that the delocalized soliton lattice wave (SLW) forms in the polymer, rather than the well-known localized excitations such as polarons and solitons. The source reservoir drives an electron-like transient dynamic SLW while the drain reservoir drives the hole-like one. These transient SLWs propagate in opposite directions and then merge and relax to a steady SLW. These results are confirmed by our analytical derivation based on the continuum model. When the bias voltages are symmetric (μ L = −μ R), the dynamic SLW subsides to the stationary soliton lattice (SL). In the energy domain, the sandwich-structured non-full filled SL bands form in the original gap, which can provide the conduction channels. Especially, in the case of the symmetric bias voltages (μ L = −μ R), the SL band is half-filled. The transmission current is the major part of the total current and the rest minor part is the effective current induced by the charge density waves accompanied by the SLW.

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Section: Discussionmentioning

confidence: 99%

Non-equilibrium charge transport in a conjugated polymer

Cheng¹,

Zhao²,

Xie³

2021

J. Phys.: Condens. Matter

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“…Thereby, one can calculate the magnetic moment at each site, given by this formula M Z = 1 2 ( n i↑ − n i↓ ). In addition, the residue theorem is the efficient and quick method for calculating equation ( 5) rather than the direct integration [43][44][45]. With the self-consistent calculation, one can evaluate the transmission coefficient from the left lead to the right lead by the following formula…”

Section: Model and Methodsmentioning

confidence: 99%

Topological edge states and transport properties in zigzag stanene nanoribbons with magnetism

Lü

Xie

2022

New J. Phys.

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In this work, we investigate the topological phase transitions and corresponding transport properties in zigzag stanene nanoribbon with different magnetism. The results show that the off-resonant circularly polarized (ORCP) light may induce anisotropic chiral edge state with a magnetic phase transition from antiferromagnetic state to nonmagnetic state. In combination with the ORCP light and electric field, the 100% spin-polarized edge state can be induced with some magnetic orders. The finite-size effect is also an important factor for the magnetic phase transitions, which in turn induces topological phase transitions from the band insulator to topological phases. By constructing the topological-insulator junctions with some topological edge states, we further study the Fabry-Perot resonant, where multiple reflection edge states cause strong current loops. By modulating the ORCP and electric field, the system can also be regarded as a switcher, to control the charge current or spin polarized current. These findings pave a way for designing topological device with magnetic edges in the future nano spintronics.

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Steady and dynamic magnetic phase transitions in the open interacting quantum dots arrays

Cited by 2 publications

References 32 publications

Non-equilibrium charge transport in a conjugated polymer

Non-equilibrium charge transport in a conjugated polymer

Topological edge states and transport properties in zigzag stanene nanoribbons with magnetism

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