Biprism electron interferometry with a single atom tip source.
Experiments with electron or ion matter waves require a coherent, monochromatic and long-term stable source with high brightness. These requirements are best fulfilled by single atom tip (SAT) field emitters. The performance of an iridium covered W(111) SAT is demonstrated and analyzed for electrons in a biprism interferometer. Furthermore we characterize the emission of the SAT in a separate field electron and field ion microscope and compare it with other emitter types. A new method is presented to fabricate the electrostatic charged biprism wire that separates and combines the matter wave. In contrast to other biprism interferometers the source and the biprism size are well defined within a few nanometers. The setup has direct applications in ion interferometry and Aharonov-Bohm physics.
Institute of Physics and Center for Collective Quantum Phenomena in LISA(+), University of Tübingen, Auf der Morgenstelle 15, 72076 Tübingen, Germany.
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Schütz
Institute of Physics and Center for Collective Quantum Phenomena in LISA(+), University of Tübingen, Auf der Morgenstelle 15, 72076 Tübingen, Germany.
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Rembold
Institute of Physics and Center for Collective Quantum Phenomena in LISA(+), University of Tübingen, Auf der Morgenstelle 15, 72076 Tübingen, Germany.
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Pooch
Institute of Physics and Center for Collective Quantum Phenomena in LISA(+), University of Tübingen, Auf der Morgenstelle 15, 72076 Tübingen, Germany.
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Meier
Vienna Center for Quantum Science and Technology, TU Wien - Atominstitut, 1020 Vienna, Austria.
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Schneeweiss
Vienna Center for Quantum Science and Technology, TU Wien - Atominstitut, 1020 Vienna, Austria.
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Rauschenbeutel
Institute of Physics and Center for Collective Quantum Phenomena in LISA(+), University of Tübingen, Auf der Morgenstelle 14, 72076Tübingen, Germany.
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Günther
Institute of Physics, Academia Sinica, Nankang, Taipei, Taiwan, Republic of China.
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Chang
Institute of Physics, Academia Sinica, Nankang, Taipei, Taiwan, Republic of China.
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Hwang
Institute of Physics and Center for Collective Quantum Phenomena in LISA(+), University of Tübingen, Auf der Morgenstelle 15, 72076 Tübingen, Germany. Electronic address: alexander.stibor@uni-tuebingen.de.
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Stibor
Biprism; Electron interferometry; Field emission; Ion beam; Matter wave; Single atom tip