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Switching, Dual Spin-Filtering Effects, and Negative Differential Resistance in a Carbon-Based Molecular Device
- Source :
- The Journal of Physical Chemistry C. 116:2570-2574
- Publication Year :
- 2012
- Publisher :
- American Chemical Society (ACS), 2012.
-
Abstract
- We present ab initio calculations for spin-dependent electron transport in a molecular device constructed by two carbon chains capped with a phenyl ring, which is sandwiched between two zig-zag-edged graphene nanoribbon (ZGNR) electrodes, where the ZGNRs are modulated by external magnetic field. The coexistence of switching, dual spin-filtering effects, and negative differential resistance (NDR) in the model device is demonstrated with the theory of carbon π-electrons. Interestingly, a two-state molecular conformational switch can be realized by changing the orientation between the planes of phenyl ring and electrodes, where the majority-spin current modulation (ON/OFF ratio) is 170–479 within the considered bias window. Moreover, the device shows perfect dual spin-filtering effect and can generate and control a full dual spin-polarized current through either the source-drain voltage or magnetic configuration of the electrodes. The selective spin current is due to a dual selection rule, the symmetry match between two ZGNR electrodes spin channel, and the carbon chain’s spin selection in our system. In addition, the obvious NDR behavior has also been observed in our model.
- Subjects :
- Graphene
Chemistry
Conductance
Nanotechnology
Ring (chemistry)
Molecular physics
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
law.invention
Magnetic field
General Energy
law
Modulation
Ab initio quantum chemistry methods
Engineering::Electrical and electronic engineering [DRNTU]
Electrode
Physical and Theoretical Chemistry
Voltage
Subjects
Details
- ISSN :
- 19327455 and 19327447
- Volume :
- 116
- Database :
- OpenAIRE
- Journal :
- The Journal of Physical Chemistry C
- Accession number :
- edsair.doi.dedup.....7e31fa2844b52c4c1cb2216cfbf73ace