Dimensional Effects on the Charge Density Waves in Ultrathin Films of TiSe2

Chen, P.; Chan, Y. -H.; Wong, M. -H.; Fang, X. -Y.; Chou, M. Y.; Mo, S. -K.; Hussain, Z.; Fedorov, A. -V.; Chiang, T. -C.

doi:10.1021/acs.nanolett.6b02710

Title: Dimensional Effects on the Charge Density Waves in Ultrathin Films of TiSe₂

Journal Article · Tue Sep 20 00:00:00 EDT 2016 · Nano Letters

DOI:https://doi.org/10.1021/acs.nanolett.6b02710· OSTI ID:1436993

Chen, P. ^[1]; Chan, Y. -H. ^[2]; Wong, M. -H. ^[3]; Fang, X. -Y. ^[3]; Chou, M. Y. ^[4]; Mo, S. -K. ^[5]; Hussain, Z. ^[5]; Fedorov, A. -V. ^[5]; Chiang, T. -C. ^[6]

Univ. of Illinois, Urbana-Champaign, IL (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 10617, Taiwan
Univ. of Illinois, Urbana-Champaign, IL (United States)
National Taiwan Univ., Taipei (Taiwan); Academia Sinica, Taipei (Taiwan); Georgia Inst. of Technology, Atlanta, GA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Univ. of Illinois, Urbana-Champaign, IL (United States); National Taiwan Univ., Taipei (Taiwan)

Charge density wave (CDW) formation in solids is a critical phenomenon involving the collective reorganization of the electrons and atoms in the system into a wave structure, and it is expected to be sensitive to the geometric constraint of the system at the nanoscale. Here, we study the CDW transition in TiSe₂, a quasi-two-dimensional layered material, to determine the effects of quantum confinement and changing dimensions in films ranging from a single layer to multilayers. Of key interest is the characteristic length scale for the transformation from a two-dimensional case to the three-dimensional limit. Angle-resolved photoemission (ARPES) measurements of films with thicknesses up to six layers reveal substantial variations in the energy structure of discrete quantum well states; however, the temperature-dependent band-gap renormalization converges at just three layers. The results indicate a layer-dependent mixture of two transition temperatures and a very-short-range CDW interaction within a three-dimensional framework.

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Research Organization:: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

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

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1436993

Journal Information:: Nano Letters, Vol. 16, Issue 10; ISSN 1530-6984

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 48 works

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