AAPT announces that Richard Price, Massachusetts Institute of Technology, will assume the position of Editor for the American Journal of Physics in 2017, following the term of David P. Jackson.
December 2016 Issue, Volume 84, No. 12
Calculation of 2D electronic band structure using matrix mechanics by R. L. Pavelich, and F. Marsiglio. DOI: 10.1119/1.4964353
In this month's feature article the authors extend previous work, applying elementary matrix mechanics to one-dimensional periodic arrays (to generate energy bands), to two-dimensional arrays. They generate band structures for the square-lattice "2D Kronig-Penney model" (square wells), the "muffin-tin" potential (circular wells), and Gaussian wells. They then apply the method to periodic arrays of more than one atomic site in a unit cell, specifically to the case of materials with hexagonal lattices like graphene. These straightforward extensions of undergraduate-level calculations allow students to readily determine band structures of current research interest..
Is the tautochrone curve unique? by Pedro Terra, Reinaldo de Melo e Souza and C. Farina. DOI: 10.1119/1.4963770
Calculation of 2D electronic band structure using matrix mechanics by R. L. Pavelich and F. Marsiglio. DOI: 10.1119/1.4964353
The physics of juggling a spinning ping-pong ball by Ralf Widenhorn. DOI: 10.1119/1.4964104
Visualization of gravitational potential wells using 3D printing technology by Jun Su, Weiguo Wang, Meishu Lu, Xinran Xu, Qi Fan Yan and Jianlong Lu. DOI: 10.1119/1.4963910
Quantum thermodynamics and work fluctuations with applications to magnetic resonance by Wellington L. Ribeiro, Gabriel T. Landi and Fernando L. Semião. DOI: 10.1119/1.4964111