Trion-Induced Negative Photoconductivity in Monolayer MoS2

Lui, C. H.; Frenzel, A. J.; Pilon, D. V.; Lee, Y. -H.; Ling, X.; Akselrod, G. M.; Kong, J.; Gedik, N.

doi:10.1103/physrevlett.113.166801

Trion-Induced Negative Photoconductivity in Monolayer ${MoS}_{2}$

Journal Article · Thu Oct 16 00:00:00 EDT 2014 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.113.166801· OSTI ID:1505762

Lui, C. H. ^[1]; Frenzel, A. J. ^[2]; Pilon, D. V. ^[3]; Lee, Y. -H. ^[4]; Ling, X. ^[3]; Akselrod, G. M. ^[3]; Kong, J. ^[3]; Gedik, N. ^[3]

Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); MIT
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Harvard Univ., Cambridge, MA (United States)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); National Tsing Hua University, Hsinchu (Taiwan)

We report that optical excitation typically enhances electrical conduction and low-frequency radiation absorption in semiconductors. We, however, observe a pronounced transient decrease of conductivity in doped monolayer molybdenum disulfide (MoS₂), a two-dimensional (2D) semiconductor, using ultrafast optical-pump terahertz-probe spectroscopy. In particular, the conductivity is reduced to only 30% of its equilibrium value at high pump fluence. This anomalous phenomenon arises from the strong many-body interactions in the 2D system, where photoexcited electron-hole pairs join the doping-induced charges to form trions, bound states of two electrons and one hole. Finally, the resultant increase of the carrier effective mass substantially diminishes the conductivity.

View Accepted Manuscript (DOE)

Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: SC0006423

OSTI ID:: 1505762

Alternate ID(s):: OSTI ID: 1180980

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 16 Vol. 113; ISSN 0031-9007; ISSN PRLTAO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE