Enhanced microwave absorption in columnar structured magnetic materials J. Appl. Phys. 112, 083908 (2012) Terahertz emission from cubic semiconductor induced by a transient anisotropic photocurrent J. Appl. Phys. 112, 073115 (2012) Resonant plasmonic effects in periodic graphene antidot arrays Appl. Phys. Lett. 101, 151119 (2012) Room temperature terahertz polariton emitter Appl. Phys. Lett. 101, 141118 (2012) Optical parameters of ZnTe determined using continuous-wave terahertz radiation A three-dimensional finite element model of an experimental near-field scanning microwave microscope (NSMM) has been developed and compared to experiment on non conducting samples. The microwave reflection coefficient S 11 is calculated as a function of frequency with no adjustable parameters. There is qualitative agreement with experiment in that the resonant frequency can show a sizable increase with sample dielectric constant; a result that is not obtained with a two-dimensional model. The most realistic model shows a semi-quantitative agreement with experiment. The effect of different sample thicknesses and varying tip sample distances is investigated numerically and shown to effect NSMM performance in a way consistent with experiment. Visualization of the electric field indicates that the field is primarily determined by the shape of the coupling hooks. V C 2012 American Institute of Physics.
The entanglement entropy of the ν = 1/3 and ν = 5/2 quantum Hall states in the presence of short range random disorder has been calculated by direct diagonalization. A microscopic model of electron-electron interaction is used, spin polarized electrons are confined to a single Landau level and interact with long range Coulomb interaction. For very weak disorder, the values of the topological entanglement entropy are roughly consistent with expected theoretical results. By considering a broader range of disorder strengths, the entanglement entropy was studied in an effort to detect quantum phase transitions. In particular, there is a signature of a transition as a function of the disorder strength for the ν = 5/2 state. Prospects for using the density matrix renormalization group to compute the entanglement entropy for larger system sizes are discussed.
The entanglement entropy of ν = 1/2 and ν = 9/2 quantum Hall states in the presence of short range disorder has been calculated by direct diagonalization. Spin polarized electrons are confined to a single Landau level and interact with long range Coulomb interaction. For ν = 1/2 the entanglement entropy is a smooth monotonic function of disorder strength. For ν = 9/2 the entanglement entropy is non monotonic suggestive of a solid-liquid phase transition. As a model of the transition at ν = 1/2 free fermions with disorder in 2 dimensions were studied. Numerical evidence suggests the entanglement entropy scales as L rather than the L ln L as in the disorder free case.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.