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Nanoscale, Phonon-Coupled Calorimetry with Sub-Attojoule/Kelvin Resolution

Fon, W. Chung and Schwab, Keith C. and Worlock, John M. and Roukes, Michael L. (2005) Nanoscale, Phonon-Coupled Calorimetry with Sub-Attojoule/Kelvin Resolution. Nano Letters, 5 (10). pp. 1968-1971. ISSN 1530-6984.

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We have developed an ultrasensitive nanoscale calorimeter that enables heat capacity measurements upon minute, externally affixed (phonon-coupled) samples at low temperatures. For a 5 s measurement at 2 K, we demonstrate an unprecedented resolution of ΔC ~ 0.5 aJ/K (~36 000 k_B). This sensitivity is sufficient to enable heat capacity measurements upon zeptomole-scale samples or upon adsorbates with sub-monolayer coverage across the minute cross sections of these devices. We describe the fabrication and operation of these devices and demonstrate their sensitivity by measuring an adsorbed ^4He film with optimum resolution of ~3 × 10^(-5) monolayers upon an active surface area of only ~1.2 × 10^(-9) m^2.

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Additional Information:Copyright © 2005 American Chemical Society. Received July 14, 2005; Revised Manuscript Received August 5, 2005. Publication Date (Web): September 7, 2005. We gratefully acknowledge support for this work from the NSF through Grant DMR-0102886.
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Record Number:CaltechAUTHORS:20090911-092252240
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Official Citation:Nanoscale, Phonon-Coupled Calorimetry with Sub-Attojoule/Kelvin Resolution W. Chung Fon,, Keith. C. Schwab,, John M. Worlock,, and, Michael L. Roukes, Nano Letters 2005 5 (10), 1968-1971
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:15765
Deposited By: George Porter
Deposited On:07 Oct 2009 21:17
Last Modified:26 Dec 2012 11:21

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