Ane Jensen - Academia.edu (original) (raw)

Papers by Ane Jensen

Physical Review B, 2001

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Toward the Controllable Quantum States - Proceedings of the International Symposium on Mesoscopic Superconductivity and Spintronics (MS+S2002), 2003

The electron transport in single-wall carbon nanotubes is one-dimensional and ballistic. Typicall... more The electron transport in single-wall carbon nanotubes is one-dimensional and ballistic. Typically carbon nanotubes form tunneling contacts to electrodes and behave as quantum dots at low temperatures. We report on experiments on carbon nanotubes contacted with ferromagnetic metal. In these devices strong hysteretic magnetoresistance is observed at low temperatures. A possible interpretation of our results is spin-polarized transport in the nanotube device, although we find quantitative disagreement with the simplest model.

2012 12th International Workshop on Junction Technology, 2012

The M4PP measurement technique has gained increased interest from the semiconductor industry for ... more The M4PP measurement technique has gained increased interest from the semiconductor industry for direct sheet resistance measurements on ultra thin layers and small structures/pads. Several fully automatic microRSP probing tools are today in use for in-line sheet resistance measurements on blanket and patterned wafers. Using the next generation of microRSP probing tools it will be possible to perform both sheet

Controllable Quantum States - Mesoscopic Superconductivity and Spintronics (MS+S2006) - Proceedings of the International Symposium, 2008

277 A WIDE GaAs/GaAlAs QUANTUM WELL SIMULTANEOUSLY CONTAINING TWO DIMENSIONAL ELECTRONS AND HOLES... more 277 A WIDE GaAs/GaAlAs QUANTUM WELL SIMULTANEOUSLY CONTAINING TWO DIMENSIONAL ELECTRONS AND HOLES ANE JENSEN, MAGDALENA UTKO, AND POUL ERIK LINDELOF Niels Bohr Institute, Nano-Science Center, University of Copenhagen, Universitetsparken ...

Physical Review B, 2005

We present two-terminal magnetotransport measurements on single-wall carbon nanotube devices, whe... more We present two-terminal magnetotransport measurements on single-wall carbon nanotube devices, where one or two of the terminals are ferromagnetic. Both ferromagnetic semiconductor ͓͑Ga,Mn͒As͔ and metal ͑Fe͒ contact materials have been investigated. In both types of devices we have observed strong hysteretic magnetoresistance below 30 K. The magnetoresistance features develop into large peaks and dips at subkelvin temperatures and they are present even with only one ferromagnetic terminal.

Physica E: Low-dimensional Systems and Nanostructures, 2002

Spin injection in hybrid ferromagnet/semiconductor devices [1] has become rather controversial in... more Spin injection in hybrid ferromagnet/semiconductor devices [1] has become rather controversial in the past years. On the one hand, a major theoretical breakthrough discovered a basic obstacle for spin injection due to material mismatch [2]. It puts forward a serious question whether ...

Nano Letters, 2004

To take advantage of nanoscale molecular electronic components in semiconductor technology, there... more To take advantage of nanoscale molecular electronic components in semiconductor technology, there will be a desire to integrate new elements such as one-dimensional (1D) carbon nanotubes in conventional 2D or 3D semiconductor systems. We report on hybrid devices based on single wall carbon nanotubes encapsulated in epitaxially grown semiconductor heterostructures of GaAs/AlAs and (Ga,Mn)As below and above the carbon nanotube. In our devices the semiconductor serves as leads to the nanotubes, forming the first reported electronic hybrid nanotube-semiconductor devices.

Journal of Applied Physics, 2002

Spin injection across a hybrid ferromagnet/semiconductor junction has proven to be difficult, unl... more Spin injection across a hybrid ferromagnet/semiconductor junction has proven to be difficult, unlike in an all-metal junction used in giant magnetoresistance devices. The difference responsible is highlighted in a simple model. We perform spin-injection-detection experiments on devices with two ferromagnetic contacts on a two-dimensional electron gas confined in an InAs quantum well. We demonstrate that spin injection allows the hybrid device to combine both the advantage of the ferromagnet as well as that of the semiconductor.

Physica C: Superconductivity, 2001

Ferromagnetic contacts on a high-mobilty two-dimensional electron gas (2DEG) in a narrow gap semi... more Ferromagnetic contacts on a high-mobilty two-dimensional electron gas (2DEG) in a narrow gap semiconductor with strong spin±orbit interaction are used to investigate spin-polarized electron transport. We demonstrate the use of magnetized contacts to preferentially inject and detect speci®c spin orientations. Spin dephasing and spin precession eects are studied by temperature and 2DEG channel length dependent measurements.