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Title: Dimensional Effects on the Charge Density Waves in Ultrathin Films of TiSe 2

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 TiSe 2, 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.
Authors:
 [1] ;  [2] ;  [3] ;  [3] ;  [4] ;  [5] ;  [5] ;  [5] ;  [6]
  1. Univ. of Illinois, Urbana-Champaign, IL (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  2. Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 10617, Taiwan
  3. Univ. of Illinois, Urbana-Champaign, IL (United States)
  4. National Taiwan Univ., Taipei (Taiwan); Academia Sinica, Taipei (Taiwan); Georgia Inst. of Technology, Atlanta, GA (United States)
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  6. Univ. of Illinois, Urbana-Champaign, IL (United States); National Taiwan Univ., Taipei (Taiwan)
Publication Date:
Grant/Contract Number:
AC02-05CH11231
Type:
Accepted Manuscript
Journal Name:
Nano Letters
Additional Journal Information:
Journal Volume: 16; Journal Issue: 10; Journal ID: ISSN 1530-6984
Publisher:
American Chemical Society
Research Org:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE
OSTI Identifier:
1436993

Chen, P., Chan, Y. -H., Wong, M. -H., Fang, X. -Y., Chou, M. Y., Mo, S. -K., Hussain, Z., Fedorov, A. -V., and Chiang, T. -C.. Dimensional Effects on the Charge Density Waves in Ultrathin Films of TiSe2. United States: N. p., Web. doi:10.1021/acs.nanolett.6b02710.
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.. Dimensional Effects on the Charge Density Waves in Ultrathin Films of TiSe2. United States. doi:10.1021/acs.nanolett.6b02710.
Chen, P., Chan, Y. -H., Wong, M. -H., Fang, X. -Y., Chou, M. Y., Mo, S. -K., Hussain, Z., Fedorov, A. -V., and Chiang, T. -C.. 2016. "Dimensional Effects on the Charge Density Waves in Ultrathin Films of TiSe2". United States. doi:10.1021/acs.nanolett.6b02710. https://www.osti.gov/servlets/purl/1436993.
@article{osti_1436993,
title = {Dimensional Effects on the Charge Density Waves in Ultrathin Films of TiSe2},
author = {Chen, P. and Chan, Y. -H. and Wong, M. -H. and Fang, X. -Y. and Chou, M. Y. and Mo, S. -K. and Hussain, Z. and Fedorov, A. -V. and Chiang, T. -C.},
abstractNote = {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.},
doi = {10.1021/acs.nanolett.6b02710},
journal = {Nano Letters},
number = 10,
volume = 16,
place = {United States},
year = {2016},
month = {9}
}