Development of a displacement sensor towards detecting quantum fluctuations in nanoelectromechanical systems

Günay, Anıl (2008) Development of a displacement sensor towards detecting quantum fluctuations in nanoelectromechanical systems. [Thesis]

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In condensed matter physics, it has been a long-standing goal to detect quantum mechanical behavior in macroscopic systems. Theoretically, a macroscopic system reveals its quantum dynamics when the mechanical quanta (hw) are not obscured by thermal fluctuations (kBT). The mechanical quanta will be observable if a mechanical resonator vibrates at GHz frequencies while kept at sub-Kelvin temperatures. Such a resonator's displacement fluctuations will be approximately a few femto-meters. Therefre, an ultra-sensitive and ultra-fast displacement sensor is desired to monitor the resonator's motion. Several research groups have been working at the edge of nanotechnology to develop such a high-performance resonator-sensor system. Despite the great effort, it has not been experimentally realized yet. In this thesis, we propose a new experimental methodology that has a major potential to approach the quantum limit. The method comprises of fabrication of a high frequency resonator with a built-in tunneling junction. Theoretical analyses reveal the clear advantage of a tunneling sensor over the presently applied capacitance based sensors. However, apparent complexities have detained their application to this problem. Here, we have developed and tested a new fabrication method that can overcome the major obstacles leading to application of this measurement scheme.
Item Type: Thesis
Uncontrolled Keywords: Quantum Measurement. -- Nanofabrication. -- Nanoelectromechanical systems. -- Tunneling. -- Displacement sensor. -- Vacuum tunnel junctions. -- Quantum mechanics. -- Nano structure. -- Nanotechnology. -- Kuantum ölçümü. -- Nanofabrikasyon. -- Nanoelektromekanik sistemler. -- Tünelleme. -- Yer değiştirme algılayıcısı. -- Vakum tünelleme eklemi. -- Kuantum mekaniği. -- Nano yapı. -- Nanoteknoloji.
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA401-492 Materials of engineering and construction. Mechanics of materials
Divisions: Faculty of Engineering and Natural Sciences > Academic programs > Materials Science & Eng.
Faculty of Engineering and Natural Sciences
Depositing User: IC-Cataloging
Date Deposited: 09 Dec 2009 16:22
Last Modified: 26 Apr 2022 09:50

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