Investigation of phosphorus-doped silicon under high magnetic fields

• Grant number: 13/07184-0
• Support Opportunities: Scholarships abroad - Research
• Start date: June 24, 2013
• End date: July 19, 2013
• Field of knowledge: Physical Sciences and Mathematics - Physics - Condensed Matter Physics
• Principal Investigator: Alexys Bruno Alfonso
• Grantee: Alexys Bruno Alfonso
• Host Investigator: Roger Adrian Lewis
• Host Institution: Faculdade de Ciências (FC). Universidade Estadual Paulista (UNESP). Campus de Bauru. Bauru , SP, Brazil
• Institution abroad: University of Wollongong (UOW), Australia

Abstract

The Research Project is part of a major project entitled "Terahertz without borders: internationalising terahertz teaching, learning and research", which is coordinated by Professor Roger A. Lewis and is financially supported by the "UIC International Links Grant Scheme 2012/13" of the University of Wollongong (UOW), in Australia. The proposed activities focus a theoretical investigation of the effects of high magnetic fields in phosphorus-doped silicon. On the one hand, different approximate methods used for the calculation of shallow-donor states in silicon will be discussed and compared. In this sense, the idea is to explain and predict the optical absorption in the regimes of intense magnetic fields (above 18T) and high radiation frequency. Effects of the magnetic-field direction, radiation polarization, coupling between valleys of the conduction bands and central-cell corrections will be taken into account. On the other hand, the results obtained by quantum-mechanical methods will be compared with those reported by other authors that make use of semiclassical approaches [Anisotropic Diamagnetic Kepler Problem, Physical Review Letters 102, 244103 (2009); Quantum Chaotic Dynamics, Physical Review Letters 105, 024101 (2010)]. Extensions of the semiclassical approach should also be performed. The collaboration with the experienced Australian group will include the participation of a Brazilian doctoral student, who is supervised by the candidate, is being mentored by Professor Lewis during six months at UOW and receives a fellowship from the Brazilian program "Science without borders". The main results of the project are expected to be published in Physical Review B. (AU)