Exotic odd–even parity effects in transmission phase, (Andreev) conductance, and shot noise of a dimer atomic chain by topology

Dong, Bing; Lei, Xu

doi:10.1016/j.aop.2018.07.012

Cited by 5 publications

(1 citation statement)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These states may contribute to either the low energy conductance or spin response when the system is coupled to external leads. A significant effect is found if there is a small coupling to the leads and a not too small or too large system (see for instance, 43,44 ). This will be considered next.…”

Section: Generalized Models: Lattice Distortion and Rashba Spin-orbitmentioning

confidence: 99%

Topological states in chiral electronic chains

Sacramento

Madeira²

2022

Phys. Rev. B

View full text Add to dashboard Cite

We consider the influence of topological phases, or their vicinity, on the spin density and spin polarization through a chiral chain. We show the quantization of the Berry phase in a one-dimensional polarization helix structure, under the presence of an external magnetic field, and show its influence on the spin density. The polar angle of the momentum space spin density becomes quantized in the regime that the Berry phase is quantized, as a result of the combined effect of the induced spin-orbit coupling and the external transverse magnetic field, while the edge states do not show the polar angle quantization, in contrast with the bulk states. Under appropriate conditions, the model can be generalized to have similarities with a chain with non-homogeneous Rashba spin-orbit couplings, with zero or low energy edge states. Due to the breaking of time-reversal symmetry, we recover the effect of chiral induced spin polarization and spin transport across the chiral chain, when coupling to external leads. Some consequences of the quantized spin polarization and low energy states on the spin transport are discussed.

show abstract

Section: Generalized Models: Lattice Distortion and Rashba Spin-orbitmentioning

confidence: 99%

Topological states in chiral electronic chains

Sacramento

Madeira²

2022

Phys. Rev. B

View full text Add to dashboard Cite

show abstract

Transport signatures of symmetry protection in 1D Floquet topological insulators

Balabanov

Johannesson

2019

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

Time-periodic external drives have emerged as a powerful tool to artificially create topological phases of matter. Prime examples are Floquet topological insulators (FTIs), where a gapped bulk supports in-gap edge states, protected against symmetry-preserving local perturbations. Similar to an ordinary static topological insulator, the robustness of an edge state in a one-dimensional (1D) FTI shows up as a pinning of its quasienergy level, but now inside one of two distinct bulk gaps. Here we propose a scheme for probing this unique feature by observing transport characteristics of a 1D finite-sized FTI attached to external leads. We present predictions for transmission spectra using a nonequilibrium Green's function approach. Our analysis covers FTIs with time-independent and periodically driven boundary perturbations which either preserve or break the protecting chiral symmetry.

show abstract

Quantum transport signatures of non-trivial topological edge states in a ring-shaped Su–Schrieffer–Heeger double-chain system

Ye¹,

Lan-Yun²,

Xue³

2022

Chinese Phys. B

View full text Add to dashboard Cite

In the ring-shaped Su–Schrieffer–Heeger (SSH) double-chain, the quantum interference between the two different electron tunneling paths of the upper and lower chains has an important influence on the electron transport properties of non-trivial topological edge states. Here, we have studied the electron transport signatures of non-trivial topological edge states in a ring-shaped SSH double-chain system based on the wave-guide theory and transfer-matrix method. In the ring-shaped SSH double-chain with the upper chain being different from the lower one, it is demonstrated that the electron transmission probability displays the four and two resonance peaks associated with the non-trivial topological edge states in the weak and strong coupling regimes, respectively. Whereas in the case of the upper chain being the same as the lower one, the two transmission resonance peaks associated with the non-trivial topological edge states in the weak coupling regime are only found, and that in the strong coupling regime disappear that originated from the destructive interference between the two different electron tunneling paths of the upper and lower chains. Consequently, the variation of the number of transmission resonance peaks associated with the non-trivial topological edge states in the weak and strong coupling regimes suggests that an alternative scheme for detecting non-trivial topological edge states in the ring-shaped SSH double-chain system.

show abstract

Exotic odd–even parity effects in transmission phase, (Andreev) conductance, and shot noise of a dimer atomic chain by topology

Cited by 5 publications

References 28 publications

Topological states in chiral electronic chains

Topological states in chiral electronic chains

Transport signatures of symmetry protection in 1D Floquet topological insulators

Quantum transport signatures of non-trivial topological edge states in a ring-shaped Su–Schrieffer–Heeger double-chain system

Contact Info

Product

Resources

About