Title:	A calculable quantum capacitance
Authors:	Kumar, N.
Issue Date:	10-May-1995
Publisher:	Indian Academy of Sciences, Bangalore, India.
Citation:	Current Science, 1995, Vol. 68, p945-946.
Abstract:	The idea of a quantum capacitance is introduced explicitly via the generally valid operational definition based on the quadratic charging energy. The direct quantum capacitance CQ per unit area for a strictly two dimensional metallic bilayer is shown to be l/πα, where α, = the Bohr radius. This calculable quantum capacitance acts in series with the usual classical capacitance Ccl = E /4πd, and is independent of the bilayer spacing d, i.e. it has a universal value. Thus, in most cases CQ >>Ccl and is, therefore, ineffective. However, for the ultrathin bi/multilayers now grown routinely epitaxially, as also for the bi/multilayers inherent to the layered high-T, superconductors, we can have CQ ≤ Ccl making CQ dominant. Some possible observable effects are pointed out.
URI:	http://hdl.handle.net/2289/981
ISSN:	0011-3891
Copyright:	Indian Academy of Sciences, Bangalore, India.
Appears in Collections:	Research Papers (LAMP) Research Papers (TP)

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