Bulletin of the American Physical Society
APS March Meeting 2018
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session K01: Advances in Scanned Probe Microscopy III
8:00 AM–11:00 AM,
Wednesday, March 7, 2018
LACC Room: 150A
Sponsoring Unit: GIMS
Chair: Fereshte Ghahari, NIST/University of Maryland, College Park
Abstract: K01.00005 : Quantum Force Measurements Using Macroscopic Molecular Tunneling
8:48 AM–9:00 AM
Microscopic force sensing is at the center of many technologies, such as atomic force microscope, inertial sensor and pressure sensor. While the stress or Van der Waals force are measured by these sensors, Casimir force is in the same scope but seldom probed experimentally. Casimir force arises from the alteration of boundary in zero point electromagnetic field, as predicted by quantum field theory. In condensed matter, alternation of the electronic wave function on a metallic surface also causes forces between nano structures under the same principle. We present a technique to measure this electron-mediated force between atomic objects using scanning tunneling microscope. Unlike Van der Waals force, this force is a strong function of geometry. The force is measured under different geometrical designs. The results are consistent with theoretical calculations.
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