Publisher’s Note: Electron-impact ionization of hydrogenlike ions in QED theory [Phys. Rev. APLRAAN1050-294710.1103/PhysRevA.81.042711<b>81</b>, 042711 (2010)]

Sun, Hsiao-Ling; Chang, Jia‐Lin; Hsiao, Ju-Tang; Lin, S. H.; Huang, Keh‐Ning

doi:10.1103/physreva.81.059902

Cited by 4 publications

(5 citation statements)

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“…1, the system we consider here consists of a single interacting QD sandwiched between a couple of nonmagnetic electrodes. The Hamiltonian of the system can be written as [33][34][35][36]…”

Section: Model and Hamiltonianmentioning

confidence: 99%

Pure spin-current diode based on interacting quantum dot tunneling junction*

Zhang¹,

Yu²,

Bo³

et al. 2021

Chinese Phys. B

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A magnetic field-controlled spin-current diode is theoretically proposed, which consists of a junction with an interacting quantum dot sandwiched between a pair of nonmagnetic electrodes. By applying a spin bias V S across the junction, a pure spin current can be obtained in a certain gate voltage regime,regardless of whether the Coulomb repulsion energy exists. More interestingly, if we applied an external magnetic field on the quantum dot, we observed a clear asymmetry in the spectrum of spin current I S as a function of spin bias, while the charge current always decays to zero in the Coulomb blockade regime. Such asymmetry in the current profile suggests a spin diode-like behavior with respect to the spin bias, while the net charge through the device is almost zero. Different from the traditional charge current diode, this design can change the polarity direction and rectifying ability by adjusting the external magnetic field, which is very convenient. This device scheme can be compatible with current technologies and has potential applications in spintronics or quantum processing.

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“…1, the system we consider here consists of a single interacting QD sandwiched between a couple of nonmagnetic electrodes. The Hamiltonian of the system can be written as [33][34][35][36]…”

Section: Model and Hamiltonianmentioning

confidence: 99%

Pure spin-current diode based on interacting quantum dot tunneling junction*

Zhang¹,

Yu²,

Bo³

et al. 2021

Chinese Phys. B

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show abstract

“…[17] Similar to the generation of charge current by bias voltage, one can use spin bias [18] to prepare and manipulate spin-polarized current [19] and spin state in low-dimensional structures. [20][21][22] Very recently, spin Seebeck effect has been observed in a metallic magnet, where a pure spin current or spin bias was induced by a temperature gradient across the system. [23] Such an effect may be used to generate and detect information encoded on electron spin in terms of thermal signals, which provides a new way of designing quantum devices based on the thermal bias instead of the usual electric bias.…”

Section: Introductionmentioning

confidence: 99%

Photon-mediated spin-polarized current in a quantum dot under thermal bias

Chi

Sun

2017

Chinese Phys. B

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Spin-polarized current generated by thermal bias across a system composed of a quantum dot (QD) connected to metallic leads is studied in the presence of magnetic and photon fields. The current of a certain spin orientation vanishes when the dot level is aligned to the lead's chemical potential, resulting in a 100% spin-polarized current. The spin-resolved current also changes its sign at the two sides of the zero points. By tuning the system's parameters, spin-up and spin-down currents with equal strength may flow in opposite directions, which induces a pure spin current without the accompany of charge current. With the help of the thermal bias, both the strength and the direction of the spin-polarized current can be manipulated by tuning either the frequency or the intensity of the photon field, which is beyond the reach of the usual electric bias voltage.

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“…How to control and manipulate electronic spin in quantum dots (QDs) is one of the important issues in condensed-matter physics and spintronics [1]. In order to successfully use the spin degree of freedom of electrons in semiconductor devices, scientists have developed various methods over the last decade, such as using ferromagnetic lead [2] or a magnetic field [3][4][5], optical pumping [6], ultrafast optical pulses [7], spin-to-charge conversion techniques [8], the spin bias method [9], etc. But until now, how to precisely adjust the magnetic or optical field at the mesoscopic scale is still a formidable challenge in experiments.…”

Section: Introductionmentioning

confidence: 99%

Spin polarization in a double-quantum dot interferometer with Rashba spin–orbit interaction

Liu¹,

Zhao²,

Wang³

et al. 2012

Phys. Scr.

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We propose a spin device consisting of three normal metal leads and double quantum dots (QDs) with Rashba spin–orbit (RSO) interaction. On the basis of the nonequilibrium Keldysh Green's function technique, the spin-polarized currents flowing in different leads and spin accumulations in QDs are investigated. It is shown that the spin-polarized currents with opposite direction can be extracted into the left and right leads, respectively, due to the quantum interference between different channels. Moreover, the magnitude and direction of polarization can be modulated electrically by shifting the dots’ levels and tuning the strength of the RSO interaction. The spin-polarized currents exhibit a 2π-periodic function with respect to φ R. In addition, the direction of the spin accumulation in two dots is exactly opposite and its magnitude and direction can be easily controlled by tuning the levels.

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Publisher’s Note: Electron-impact ionization of hydrogenlike ions in QED theory [Phys. Rev. APLRAAN1050-294710.1103/PhysRevA.81.04271181, 042711 (2010)]

Cited by 4 publications

References 0 publications

Pure spin-current diode based on interacting quantum dot tunneling junction*

Pure spin-current diode based on interacting quantum dot tunneling junction*

Photon-mediated spin-polarized current in a quantum dot under thermal bias

Spin polarization in a double-quantum dot interferometer with Rashba spin–orbit interaction

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