Abstract:
:The study of carrier multiplication has become an essential part of many-body physics and materials science as this multiplication directly affects nonlinear transport phenomena, and has a key role in designing efficient solar cells and electroluminescent emitters and highly sensitive photon detectors. Here we show that a 1-MVcm(-1) electric field of a terahertz pulse, unlike a DC bias, can generate a substantial number of electron-hole pairs, forming excitons that emit near-infrared luminescence. The bright luminescence associated with carrier multiplication suggests that carriers coherently driven by a strong electric field can efficiently gain enough kinetic energy to induce a series of impact ionizations that can increase the number of carriers by about three orders of magnitude on the picosecond time scale.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Hirori H,Shinokita K,Shirai M,Tani S,Kadoya Y,Tanaka Kdoi
10.1038/ncomms1598subject
Has Abstractpub_date
2011-12-20 00:00:00pages
594issn
2041-1723pii
ncomms1598journal_volume
2pub_type
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