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Title: Light-induced dimension crossover dictated by excitonic correlations

Journal Article · · Nature Communications
 [1]; ORCiD logo [2];  [3];  [4]; ORCiD logo [1];  [5];  [5];  [1];  [1];  [1];  [1];  [1];  [1]; ORCiD logo [6];  [5]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [7]; ORCiD logo [2]; ORCiD logo [1] more »; ORCiD logo [1] « less
  1. Shanghai Jiao Tong University (China)
  2. University of California at Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
  3. Chinese Academy of Sciences, Beijing (China)
  4. ShanghaiTech University (China); ShanghaiTech Laboratory for Topological Physics (China)
  5. Tsinghua University, Beijing (China)
  6. ShanghaiTech University (China)
  7. University of California at Los Angeles, CA (United States)
+ Show Author Affiliations

In low-dimensional systems with strong electronic correlations, the application of an ultrashort laser pulse often yields novel phases that are otherwise inaccessible. The central challenge in understanding such phenomena is to determine how dimensionality and many-body correlations together govern the pathway of a non-adiabatic transition. To this end, we examine a layered compound, 1T-TiSe2, whose three-dimensional charge-density-wave (3D CDW) state also features exciton condensation due to strong electron-hole interactions. We find that photoexcitation suppresses the equilibrium 3D CDW while creating a nonequilibrium 2D CDW. Remarkably, the dimension reduction does not occur unless bound electron-hole pairs are broken. This relation suggests that excitonic correlations maintain the out-of-plane CDW coherence, settling a long-standing debate over their role in the CDW transition. Our findings demonstrate how optical manipulation of electronic interaction enables one to control the dimensionality of a broken-symmetry order, paving the way for realizing other emergent states in strongly correlated systems.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
Ministry of Science and Technology of China; National Natural Science Foundation of China; USDOE
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
2470981
Journal Information:
Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 13; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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