Magnetically tunable spin-polarization of the current through a double quantum dot device

Autor:	Hui Pan, Cong Wang, Suqing Duan, Wei Zhang, Wei-Dong Chu
Rok vydání:	2008
Předmět:	Physics Spin polarization Condensed matter physics Coulomb blockade General Chemistry Condensed Matter Physics Polarization (waves) Magnetic field Magnetization Ferromagnetism Quantum dot Materials Chemistry Condensed Matter::Strongly Correlated Electrons Diode
Zdroj:	Solid State Communications. 148:69-73
ISSN:	0038-1098
DOI:	10.1016/j.ssc.2008.07.003
Popis:	We theoretically study the spin-dependent transport in a double quantum dot device connected with normal-metal and ferromagnetic leads by using the nonequilibrium Green’s function method. In the absence of an external magnetic field, the current polarization is zero for a range of positive bias, while it is a relatively large value for a negative bias. In the presence of an external magnetic field perpendicular to the magnetization of the lead, the spin–flip effects make the current spin-polarized for both of the positive and negative bias. Thus the device can operate as a magnetically tunable spin-polarized current diode.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::30cff4ff80c06c51ba3ff7f78e03136e https://doi.org/10.1016/j.ssc.2008.07.003 Zobrazit plný text záznamu Full Text from ScienceDirect