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SUMMARY:Electron transport in disordered two-dimensional materials - Chi-T
 e Liang\, Department of Physics National Taiwan University & Stanford Univ
 ersity\, Stanford 
DTSTART:20160707T130000Z
DTEND:20160707T140000Z
UID:TALK66767@talks.cam.ac.uk
CONTACT:46722
DESCRIPTION:Two-dimensional (2D) materials [1] such as graphene\, MoS2\, M
 oSe2\, WSe2\, etc. have been attracting much interest because of their fun
 damental importance as well as their potential device applications. In thi
 s talk I will concentrate on disordered 2D materials in which interesting 
 physical phenomena can be observed. I shall describe charge transport in a
  monolayer MoS2 flake over a wide range of carrier density\, temperature a
 nd electric bias. We find that the transport is best described by a percol
 ating picture in which the disorder breaks translational invariance\, brea
 king the MoS2 system up into a series of electron puddles\, rather than pr
 evious pictures in which the disorder is treated as uniform and homogeneou
 s. Our work provides useful insight to a unified picture of charge transpo
 rt in monolayer MoS2 nanoflakes. If time permits\, I shall describe strong
 ly insulating behaviour observed in monolayer epitaxial graphene grown on 
 SiC\, floating-up the extended states at low magnetic fields in graphene\,
  and its relevance to the direct insulator-quantum Hall transition in two 
 dimensions [2].\nThis work was done in collaboration with C. Chuang. R. E.
  Elmquist\, A. R. Hamilton\, L.-I. Huang\, O. Klochan\, C.-H. Liu\, S.-T. 
 Lo\, W. H. Wang\, and Y. Yang. I would like to acknowledge financial suppo
 rt from the Ministry of Science and Technology (MOST)\, Taiwan (grant numb
 ers: MOST 102-2119-M-002-016-MY3 and MOST 103-2918-I-002-028) and National
  Taiwan University (grant numbers: 102R7863\, 103R7552-2 and 104R7552-2\, 
 and 105R203302).\n\n[1] V. I. Fal'ko\, 2D Mater. 1\, 010201 (2014).\n[2] C
 .-T. Liang and S.-T. Lo\, Chin. J. Phys. 52\, 1175 (2014).\n\n\n
LOCATION:Cambridge Graphen Centre- Seminar Room. 9 JJ Thomson Avenue
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