Searching for the Casimir Energy
In this article, we present a nano-electromechanical system (NEMS) designed to detect changes in the Casimir Energy. The Casimir effect is a result of the appearance of quantum fluctuations in the electromagnetic vacuum. Previous experiments have used nano- or micro- scale parallel plate capacitors...
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Abstract | In this article, we present a nano-electromechanical system (NEMS) designed to detect changes in the Casimir Energy. The Casimir effect is a result of the appearance of quantum fluctuations in the electromagnetic vacuum. Previous experiments have used nano- or micro- scale parallel plate capacitors to detect the Casimir force by measuring the small attractive force these fluctuations exert between the two surfaces. In this new set of experiments, we aim to directly detect shifts in the Casimir \(\textit{energy}\) in the vacuum due to the presence of metallic parallel plates, one of which is a superconductor. A change in the Casimir energy of this configuration is predicted to shift the superconducting transition temperature (T\(_\textrm{c}\)) because of an interaction between it and the superconducting condensation energy. The experiment we discuss consists of taking a superconducting film, carefully measuring its transition temperature, bringing a conducting plate close to the film, creating a Casimir cavity, and then measuring the transition temperature again. The expected shifts will be small, comparable to the normal shifts one sees in cycling superconducting films to cryogenic temperatures and so using a NEMS resonator and doing this in situ is the only practical way to obtain accurate, reproducible data. Using a thin Pb film and opposing Au surface, we observe no shift in T\(_\textrm{c}\) greater than 12 \(\mu\)K down to a minimum spacing of approximately 70 nm. |
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AbstractList | Microsystems & Nanoengineering volume 6, Article number: 115
(2020) In this article, we present a nano-electromechanical system (NEMS) designed
to detect changes in the Casimir Energy. The Casimir effect is a result of the
appearance of quantum fluctuations in the electromagnetic vacuum. Previous
experiments have used nano- or micro- scale parallel plate capacitors to detect
the Casimir force by measuring the small attractive force these fluctuations
exert between the two surfaces. In this new set of experiments, we aim to
directly detect shifts in the Casimir $\textit{energy}$ in the vacuum due to
the presence of metallic parallel plates, one of which is a superconductor. A
change in the Casimir energy of this configuration is predicted to shift the
superconducting transition temperature (T$_\textrm{c}$) because of an
interaction between it and the superconducting condensation energy. The
experiment we discuss consists of taking a superconducting film, carefully
measuring its transition temperature, bringing a conducting plate close to the
film, creating a Casimir cavity, and then measuring the transition temperature
again. The expected shifts will be small, comparable to the normal shifts one
sees in cycling superconducting films to cryogenic temperatures and so using a
NEMS resonator and doing this in situ is the only practical way to obtain
accurate, reproducible data. Using a thin Pb film and opposing Au surface, we
observe no shift in T$_\textrm{c}$ greater than 12 $\mu$K down to a minimum
spacing of approximately 70 nm. In this article, we present a nano-electromechanical system (NEMS) designed to detect changes in the Casimir Energy. The Casimir effect is a result of the appearance of quantum fluctuations in the electromagnetic vacuum. Previous experiments have used nano- or micro- scale parallel plate capacitors to detect the Casimir force by measuring the small attractive force these fluctuations exert between the two surfaces. In this new set of experiments, we aim to directly detect shifts in the Casimir \(\textit{energy}\) in the vacuum due to the presence of metallic parallel plates, one of which is a superconductor. A change in the Casimir energy of this configuration is predicted to shift the superconducting transition temperature (T\(_\textrm{c}\)) because of an interaction between it and the superconducting condensation energy. The experiment we discuss consists of taking a superconducting film, carefully measuring its transition temperature, bringing a conducting plate close to the film, creating a Casimir cavity, and then measuring the transition temperature again. The expected shifts will be small, comparable to the normal shifts one sees in cycling superconducting films to cryogenic temperatures and so using a NEMS resonator and doing this in situ is the only practical way to obtain accurate, reproducible data. Using a thin Pb film and opposing Au surface, we observe no shift in T\(_\textrm{c}\) greater than 12 \(\mu\)K down to a minimum spacing of approximately 70 nm. |
Author | Lally, Richard W Stange, Alexander Campbell, David K Bishop, David J Aksyuk, Vladimir A Pérez-Morelo, Diego Barrett, Lawrence K Imboden, Matthias |
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BackLink | https://doi.org/10.1038/s41378-020-00221-2$$DView published paper (Access to full text may be restricted) https://doi.org/10.48550/arXiv.2004.13771$$DView paper in arXiv |
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Snippet | In this article, we present a nano-electromechanical system (NEMS) designed to detect changes in the Casimir Energy. The Casimir effect is a result of the... Microsystems & Nanoengineering volume 6, Article number: 115 (2020) In this article, we present a nano-electromechanical system (NEMS) designed to detect... |
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SubjectTerms | Change detection Cryogenic temperature Nanoelectromechanical systems Parallel plates Physics - Applied Physics Physics - Mesoscale and Nanoscale Physics Quantum theory Superconducting films Superconductivity Temperature Transition temperature Yang-Mills theory |
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