Nano-orbitronics in silicon
Shallow donor impurities in silicon, once frozen out at low temperature, share many properties in common with free hydrogen atoms . They have long been the subject of spectroscopic investigation, but it is only very recently [2,3] that it has been possible to investigate the time-domain dynamics of orbital excitations such as the 1 s to 2p, due to the difficulty of obtaining short, intense pulses in the relevant wavelength range. These new techniques make shallow donors (and also acceptors ) attractive for studying atomic physics effects, and for applications in quantum information. We have measured the population dynamics of electrons orbiting around phosphorus impurities in commercially-available silicon, and shown that the lattice relaxation lifetime is about 200 ps, only 1 order of magnitude shorter than the radiative lifetime of free hydrogen.
KeywordsWhite Dwarf Radiative Lifetime Shallow Donor Lattice Relaxation Time Free Hydrogen
- 1.B.N. Murdin, Juerong Li, M.L.Y. Pang, E.T. Bowyer, K.L. Litvinenko, S.K. Clowes, H. Engelkamp, C.R. Pidgeon, I. Galbraith, N.V. Abrosimov, H. Riemann, S.G. Pavlov, H.W. Hübers & P.G. Murdin “Si:P as a laboratory analogue for hydrogen on high magnetic field white dwarf stars” Nature Communications 4, 1469 (2013).Google Scholar
- 2.N. Q. Vinh, P. T. Greenland, K. Litvinenko, B. Redlich, A. F. G. van der Meer, S. A. Lynch,† M. Warner, A. M. Stoneham, G. Aeppli, D. J. Paul, C. R. Pidgeon, and B. N. Murdin, “ Silicon as a model ion trap: Time domain measurements of donor Rydberg states” Proc Nat Acad Sci USA 105, 10649 (2008).Google Scholar
- 3.P. T. Greenland, S. A. Lynch, A. F. G. van der Meer, B. N. Murdin, C. R. Pidgeon, B. Redlich, N. Q. Vinh & G. Aeppli, “Coherent control of Rydberg states in silicon” Nature 465, 1057 (2010).Google Scholar
- 4.N. Q. Vinh, B. Redlich, A. F. G. van der Meer, C. R. Pidgeon, P. T. Greenland, S. A. Lynch, G. Aeppli, and B. N. Murdin “Time-Resolved Dynamics of Shallow Acceptor Transitions in Silicon” Phys Rev X 3, 011019 (2013).Google Scholar