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Paper detail

Electrical detection of optically pumped spin polarization in Ge

Here we show the room temperature integrated detection of the helicity of photons with 1300 nm wavelength, via spin- photodiodes based on fully epitaxial Fe/MgO/Ge(001) heterostructures. These devices convert the photon helicity in a variation of the photocurrent (ΔI) for opposite orientations of the Fe magnetization. We found ΔI on the order of 5.9% for 100% circularly polarized light, both in the forward and the reverse bias, with a contribution of 0.8% from the Fe dichroic light absorption and of 5.1% from the spin filtering of photo-generated carriers crossing the Fe/MgO/Ge tunneling barrier.

preprint2011arXivOpen access
C. RinaldiM. CantoniD. PettiM. LeoneN. M. CaffreyS. SanvitoR. Bertacco
cond-mat.mtrl-sci
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C. RinaldiM. CantoniD. PettiM. LeoneN. M. CaffreyS. SanvitoR. Bertacco

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