Browsing by Author "Bauer, B."
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- The ALPS project release 2.0: open source software for strongly correlated systemsBauer, B.; Carr, L. D.; Evertz, H. G.; Feiguin, A.; Freire, J.; Fuchs, S.; Gamper, L.; Gukelberger, J.; Gull, E.; Guertler, S.; Hehn, A.; Igarashi, R.; Isakov, S. V.; Koop, D.; Ma, P. N.; Mates, P.; Matsuo, H.; Parcollet, O.; Pawlowski, G.; Picon, J. D.; Pollet, L.; Santos, Eunice E.; Scarola, Vito W.; Schollwoeck, U.; Silva, C.; Surer, B.; Todo, S.; Trebst, S.; Troyer, M.; Wall, M. L.; Werner, P.; Wessel, S. (IOP, 2011-05-01)We present release 2.0 of the ALPS (Algorithms and Libraries for Physics Simulations) project, an open source software project to develop libraries and application programs for the simulation of strongly correlated quantum lattice models such as quantum magnets, lattice bosons, and strongly correlated fermion systems. The code development is centered on common XML and HDF5 data formats, libraries to simplify and speed up code development, common evaluation and plotting tools, and simulation programs. The programs enable non-experts to start carrying out serial or parallel numerical simulations by providing basic implementations of the important algorithms for quantum lattice models: classical and quantum Monte Carlo (QMC) using non-local updates, extended ensemble simulations, exact and full diagonalization (ED), the density matrix renormalization group (DMRG) both in a static version and a dynamic time-evolving block decimation (TEBD) code, and quantum Monte Carlo solvers for dynamical mean field theory (DMFT). The ALPS libraries provide a powerful framework for programers to develop their own applications, which, for instance, greatly simplify the steps of porting a serial code onto a parallel, distributed memory machine. Major changes in release 2.0 include the use of HDF5 for binary data, evaluation tools in Python, support for the Windows operating system, the use of CMake as build system and binary installation packages for Mac OS X and Windows, and integration with the VisTrails work ow provenance tool. The software is available from our web server at http://alps.comp-phys.org/.
- Distinguishing phases with ansatz wave functionsBauer, B.; Troyer, M.; Scarola, Vito W.; Whaley, K. B. (2010-02)
- Evaluating contingent and actual contributions to a local public good: Tsetse control in the Yale agro-pastoral zone, Burkina FasoKamuanga, M.; Swallow, Brent M.; Sigué, H.; Bauer, B. (Elsevier Science B.V., 2001)In this case study of the Yale agro-pastoral zone in southern Burkina Faso, the sustainability of tsetse control as a local public good was shown to depend upon farmers' contributions to establish and maintain the traps and targets that attract and kill tsetse flies. Contingent valuation (CV) techniques were used to generate estimates of farmers' willingness to pay for tsetse control in money, labour, or both forms of payment. Of the 261 households that participated in the CV survey, these proportions were 23, 37 and 40 percent, respectively, indicating differentiation among the population and an overall preference for labour contribution. A comparison of predicted versus actual contribution of labour indicated that only 56 percent of households that said they would contribute actually contributed; 3 percent of households that said they would not contribute actually contributed. Major factors affecting contingent contributions of labour in discrete choice models were identified, as well as those to account for in any successful scheme for actual labour contribution. These factors include the age of household head, offtake of cattle, involvement in secondary activities, membership in rural organizations, current expenditure on drug therapy, and cash-on-hand. The results also indicate that full cost-recovery of the investment in targets--about US$8000--could not be achieved in the short run with the proposed contribution of US$0.90-1.00 per month per household. Contingent contributions of money were interpreted as maximum donations to expect of beneficiaries as part of the total cost of providing tsetse control.--abstract from Journal
- Identifying quantum topological phases through statistical correlationWang, H.; Bauer, B.; Troyer, M.; Scarola, Vito W. (American Physical Society, 2011-03-14)We theoretically examine the use of a statistical distance measure, the indistinguishability, as a generic tool for the identification of topological order. We apply this measure to the toric code and two fractional quantum Hall models. We find that topologically ordered states can be identified with the indistinguishability for both models. Calculations with the indistinguishability also underscore a key distinction between symmetries that underlie topological order in the toric code and quantum Hall models.
- Identifying quantum topological phases through statistical correlationWang, H.; Bauer, B.; Troyer, M.; Scarola, Vito W. (American Physical Society, 2011-03-14)