Effects of Interactions in Transport through Aharonov-Bohm-Casher Interferometers

Lobos, Alejandro M.; Aligia, A. A.

doi:10.1103/physrevlett.100.016803

Cited by 49 publications

(39 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…An important consequence is the existence of the AC oscillations of zero-field conductance G(0) with the strength of the SO coupling. The AC oscillations were intensively discussed theoretically [12][13][14][15][16][17]21,[24][25][26][27][29][30][31][32][33]35 and their signatures were observed experimentally. 22,23 Another consequence, especially important from the point of view of possible applications, is that the unpolarized incoming electron beam acquires polarization after passing through the ring, so that the ring may serve as a spin polarizer.…”

mentioning

confidence: 99%

High-temperature Aharonov-Bohm-Casher interferometer

2012

View full text Add to dashboard Cite

We study theoretically the combined effect of the spin-orbit and Zeeman interactions on the tunneling electron transport through a single-channel quantum ring threaded by magnetic flux. We focus on the high temperature case (temperature is much higher than the level spacing in the ring) and demonstrate that spin-interference effects are not suppressed by thermal averaging. In the absence of the Zeeman coupling the high-temperature tunneling conductance of the ring exhibits two types of oscillations: Aharonov-Bohm oscillations with magnetic flux and AharonovCasher oscillations with the strength of the spin-orbit interaction. For weak tunneling coupling both oscillations have the form of sharp periodic antiresonances. In the vicinity of the antiresonances the tunneling electrons acquire spin polarization, so that the ring serves as a spin polarizer. We also demonstrate that the Zeeman coupling leads to appearance of two additional peaks both in the tunneling conductance and in the spin polarization.

show abstract

mentioning

confidence: 99%

High-temperature Aharonov-Bohm-Casher interferometer

2012

View full text Add to dashboard Cite

show abstract

“…This phase is additional with respect to AB phase and exists even at zero external magnetic field (φ = 0) so that zero-field conductance exhibits the Aharonov-Casher (AC) effect: 31,32 periodic oscillations with the strength of the SO coupling. The AC oscillations were the focus of intensive theoretical [33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49] research and their signatures were observed experimentally. 50,51 Recently, we demonstrated that these oscillations are also not suppressed by thermal averaging, 52 in a full analogy with the AB ones.…”

Section: 2mentioning

confidence: 99%

Aharonov-Bohm conductance of a disordered single-channel quantum ring

2013

View full text Add to dashboard Cite

We study the effect of weak disorder on tunneling conductance of a single-channel quantum ring threaded by magnetic flux. We assume that temperature is higher than the level spacing in the ring and smaller than the Fermi energy. In the absence of disorder, the conductance shows sharp dips (antiresonances) as a function of magnetic flux. We discuss different types of disorder and find that the short-range disorder broadens antiresonances, while the long-range one leads to arising of additional resonant dips. We demonstrate that the resonant dips have essentially non-Lorentzian shape. The results are generalized to account for the spin-orbit interaction which leads to splitting of the disorder-broadened resonant dips, and consequently to coexisting of two types of oscillations (both having the form of sharp dips): Aharonov-Bohm oscillations with magnetic flux and AharonovCasher oscillations with the strength of the spin-orbit coupling. We also discuss the effect of the Zeeman coupling.

show abstract

“…In QD structures, the RSO interaction give rises to an extra spin-dependent phase factor in the coupling matrix elements between the leads and the QD and the inter-level spin-flip term [10]. Hence, the RSO interaction makes the quantum transport phenomena rich and complicated [9]. Recently, Vernek et al [10] theoretically predicted that the combination of RSO interaction and the Aharonov-Bohm (AB) effect strongly suppresses the Kondo resonance, and Lim et al [11] found…”

mentioning

confidence: 96%

Kondo effect in a double quantum dot interferometer with Rashba spin–orbit interaction

Liu

Yin

Wan

et al. 2011

Physica Status Solidi (b)

View full text Add to dashboard Cite

Electronic transport through a double quantum dot interferometer with Rashba spin-orbit interaction is investigated. By means of the slave-boson mean-field approximation and Green function technique, we calculated the local density of states (DOS) and the linear conductance in the Kondo regime at zero temperature. It is shown that the local DOS and the linear conductance of each spin component can be tuned by the Rashba spin-orbit interaction with help of the magnetic flux. In particular, by modulating the strength of the Rashba spin-orbit interaction properly, only one spin component electron can be allowed to transport through this structure. 1 Introduction The Kondo effect in artificial quantum dots (QD) was predicted theoretically more than two decades ago [1,2]. The phenomenon in QD occurs because of a strong antiferromagnetic coupling between the localized spin in the QD and the conduction band electrons in the electrodes through higher-order tunneling processes. The resulting correlated motion gives rise to a Kondo singularity in the density of states (DOS) at the Fermi level and the enhanced conductance. The Kondo effect in the coupled QD has attracted much attention both experimentally and theoretically [3][4][5], recently. The flexibility in tuning various parameters of coupled quantum dos has enabled the study of Kondo phenomena in great detail.In addition, the Rashba spin-orbit (RSO) interaction is an important mechanism that influences the electron-spin state in low-dimensional structures [6][7][8]. The RSO interaction comes into play by introducing an electric field that destroys the symmetry of space inversion in an arbitrary spatial direction. In QD structures, the RSO interaction give rises to an extra spin-dependent phase factor in the coupling matrix elements between the leads and the QD and the inter-level spin-flip term [10]. Hence, the RSO interaction makes the quantum transport phenomena rich and complicated [9]. Recently, Vernek et al. [10] theoretically predicted that the combination of RSO interaction and the Aharonov-Bohm (AB) effect strongly suppresses the Kondo resonance, and Lim et al. [11] found

show abstract

Effects of Interactions in Transport through Aharonov-Bohm-Casher Interferometers

Cited by 49 publications

References 23 publications

High-temperature Aharonov-Bohm-Casher interferometer

High-temperature Aharonov-Bohm-Casher interferometer

Aharonov-Bohm conductance of a disordered single-channel quantum ring

Kondo effect in a double quantum dot interferometer with Rashba spin–orbit interaction

Contact Info

Product

Resources

About