Nonequilibrium spin transport through a diluted magnetic semiconductor quantum dot system with noncollinear magnetization

Ma, Mengyu; Jalil, M. B. A.; Tan, S. G.

doi:10.1016/j.aop.2012.11.016

Cited by 1 publication

(1 citation statement)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This corresponds to setting = - | | is not simultaneously zero, the current flowing through the current wires attached to the nodes will be nearly zero, leading to a sharp spike in the impedance Z ab . This phenomenon is similar to that in quantum-dot (QD) systems [54,55], in which a resonance occurs in the transmission across the system when the Fermi energy in the leads coincides with one of the discrete energy levels in the QD. Here C plays the role of the lead Fermi energy and c j the discrete energy levels in the QD.…”

Section: Impedance Spectrum Analysissupporting

confidence: 67%

Realization of Weyl semimetal phases in topoelectrical circuits

et al. 2020

View full text Add to dashboard Cite

In this work, we demonstrate a simple and effective method to design and realize various Weyl semimetal (WSM) states in a three-dimensional periodic circuit lattice composed of passive electric circuit elements such as inductors and capacitors (LC). The experimental accessibility of such LC circuits offers a ready platform for the realization of not only various WSM phases but also for exploring transport properties in topological systems. The characteristics of such LC circuits are described by the circuit admittance matrices, which are mathematically related to the Hamiltonian of the quantum tight-binding model. The system can be switched between the Type-I and Type-II WSM phases simply by an appropriate choice of inductive or capacitive coupling between certain nodes. A peculiar phase with a flat admittance band emerges at the transition between the Type-I and Type-II Weyl phases. Impedance resonances occur in the LC circuits at certain frequencies associated with vanishing eigenvalues of the admittance matrix. The impedance readout can be used to classify the Type-I and Type-II WSM states. A Type-I WSM shows impedance peaks only at the Weyl points (WPs) whereas a Type-II WSM exhibits multiple secondary peaks near the WPs. This impedance behaviour reflects the vanishing and non-vanishing density of states at the Weyl nodes in the Type-I and Type-II WSM phases, respectively.

show abstract

Section: Impedance Spectrum Analysissupporting

confidence: 67%