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271. Weight Functions for Biases in Atomic Frequency Standards
Jon Hardy Shirley
Many perturbations that affect atomic frequency standards vary during the period of measurement. To include this time variation, we introduce three time-dependent weight functions built from the solution of the unperturbed equations of motion of a t ...
272. Yb Optical Lattice Clock
Nathan D. Lemke, Andrew D Ludlow, Zeb Barber, N Poli, C.W. Hoyt, Long-Sheng Ma, Jason Stalnaker, Christopher W Oates, Leo Hollberg, James C Bergquist, A. Brusch, Tara Michele Fortier, Scott A Diddams, Thomas Patrick Heavner, Steven R Jefferts, Thomas Edward Parker
We describe the development and latest results of an optical lattice clock based on neutral Yb atoms, including investigations based on both even and odd isotopes. We report a fractional frequency uncertainty below 10^u-15^ for ^u171^Yb.
273. Zero-energy modes and gate-tunable gap in graphene on hexagonal boron nitride
Markus Kindermann, Bruno Uchoa, David L. Miller
In this article, we derive an effective theory of graphene on a hexagonal boron nitride (h-BN) substrate. We show that the h-BN substrate generically opens a spectral gap in graphene despite the lattice mismatch. The origin of that gap is particularl ...