1. Department of Physics, McGill University 1 , Montréal, Québec H3A 2A7, Canada
2. Department of Mining and Materials Engineering, McGill University 2 , Montréal, Québec H3A 2A7, Canada
3. Department of Electrical and Computer Engineering, McGill University 3 , Montréal, Québec H3A 2A7, Canada