Abstract:
:Excitons are spin integer particles that are predicted to condense into a coherent quantum state at sufficiently low temperature. Here by using photocurrent imaging we report experimental evidence of formation and efficient transport of non-equilibrium excitons in Bi2-xSbxSe3 nanoribbons. The photocurrent distributions are independent of electric field, indicating that photoexcited electrons and holes form excitons. Remarkably, these excitons can transport over hundreds of micrometers along the topological insulator (TI) nanoribbons before recombination at up to 40 K. The macroscopic transport distance, combined with short carrier lifetime obtained from transient photocurrent measurements, indicates an exciton diffusion coefficient at least 36 m2 s-1, which corresponds to a mobility of 6 × 104 m2 V-1 s-1 at 7 K and is four order of magnitude higher than the value reported for free carriers in TIs. The observation of highly dissipationless exciton transport implies the formation of superfluid-like exciton condensate at the surface of TIs.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Hou Y,Wang R,Xiao R,McClintock L,Clark Travaglini H,Paulus Francia J,Fetsch H,Erten O,Savrasov SY,Wang B,Rossi A,Vishik I,Rotenberg E,Yu Ddoi
10.1038/s41467-019-13711-3subject
Has Abstractpub_date
2019-12-16 00:00:00pages
5723issue
1issn
2041-1723pii
10.1038/s41467-019-13711-3journal_volume
10pub_type
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