Now showing items 1-9 of 9

    • Deactivation of metastable single-crystal silicon hyperdoped with sulfur 

      Simmons, C. B.; Akey, Austin; Krich, Jacob; Sullivan, Joseph T.; Recht, Daniel; Aziz, Michael J.; Buonassisi, Tonio (AIP Publishing, 2013)
      Silicon supersaturated with sulfur by ion implantation and pulsed laser melting exhibits broadband optical absorption of photons with energies less than silicon's band gap. However, this metastable, hyperdoped material ...
    • Dynamic Nuclear Polarization in Double Quantum Dots 

      Gullans, Michael John; Krich, Jacob Jonathan; Taylor, Jacob Mason; Bluhm, Hendrik; Halperin, Bertrand I.; Marcus, Charles Masamed; Stopa, Michael P; Yacoby, Amir; Lukin, Mikhail D. (American Physical Society, 2010)
      We theoretically investigate the controlled dynamic polarization of lattice nuclear spins in GaAs double quantum dots containing two electrons. Three regimes of long-term dynamics are identified, including the buildup of ...
    • Nonradiative Lifetimes in Intermediate Band Materials - Absence of Lifetime Recovery 

      Krich, Jacob Jonathan; Halperin, Bertrand I.; Aspuru-Guzik, Alan (American Physical Society, 2012)
      Intermediate band photovoltaics hold the promise of being highly efficient and cost effective photovoltaic cells. Intermediate states in the band gap, however, are known to facilitate nonradiative recombination. Much ...
    • Picosecond carrier recombination dynamics in chalcogen-hyperdoped silicon 

      Sher, Meng-Ju; Simmons, Christie B.; Krich, Jacob; Akey, Austin; Winkler, Mark T.; Recht, Daniel; Buonassisi, Tonio; Aziz, Michael J.; Lindenberg, Aaron M. (AIP Publishing, 2014)
      Intermediate-band materials have the potential to be highly efficient solar cells and can be fabricate by incorporating ultrahigh concentrations of deep-level dopants. Direct measurements of the ultrafast carrier recombination ...
    • Practical witness for electronic coherences 

      Johnson, Allan S.; Yuen-Zhou, Joel; Aspuru-Guzik, Alan; Krich, Jacob (AIP Publishing, 2014)
      The origin of the coherences in two-dimensional spectroscopy of photosynthetic complexes remains disputed. Recently, it has been shown that in the ultrashort-pulse limit, oscillations in a frequency-integrated pump-probe ...
    • Quantum state and process tomography of energy transfer systems via ultrafast spectroscopy 

      Yuen-Zhou, Joel; Krich, Jacob; Mohseni, Masoud; Aspuru-Guzik, Alan (Proceedings of the National Academy of Sciences, 2011)
      The description of excited state dynamics in energy transfer systems constitutes a theoretical and experimental challenge in modern chemical physics. A spectroscopic protocol that systematically characterizes both coherent ...
    • Scaling and Localization Lengths of a Topologically Disordered System 

      Krich, Jacob Jonathan; Aspuru-Guzik, Alán (American Physical Society, 2011)
      We consider a noninteracting disordered system designed to model particle diffusion, relaxation in glasses, and impurity bands of semiconductors. Disorder originates in the random spatial distribution of sites. We find ...
    • Spin Polarized Current Generation from Quantum Dots without Magnetic Fields 

      Krich, Jacob; Halperin, Bertrand (American Physical Society, 2008)
      An unpolarized charge current passing through a chaotic quantum dot with spin-orbit coupling can produce a spin-polarized exit current without magnetic fields or ferromagnets. We use random matrix theory to estimate the ...
    • A Witness for Coherent Electronic vs Vibronic-Only Oscillations in Ultrafast Spectroscopy 

      Yuen-Zhou, Joel; Krich, Jacob; Aspuru-Guzik, Alan (American Institute of Physics, 2012)
      We report a conceptually straightforward witness that distinguishes coherent electronic oscillations from their vibronic-only counterparts in nonlinear optical spectra of molecular aggregates. Coherent oscillations as a ...