TY - JOUR
T1 - Ultrafast Dynamics of the Topological Semimetal GdSbxTe2-x-δ in the Presence and Absence of a Charge Density Wave
AU - Kirby, Robert J.
AU - Montanaro, Angela
AU - Giusti, Francesca
AU - Koch-Liston, André
AU - Lei, Shiming
AU - Petrides, Ioannis
AU - Narang, Prineha
AU - Burch, Kenneth S.
AU - Fausti, Daniele
AU - Scholes, Gregory D.
AU - Schoop, Leslie M.
N1 - Funding Information:
This work was supported by AFSOR, Grant FA9550-20-1-0246. Additional support came from the NSF through the Princeton Center for Complex Materials, a Materials Research Science and Engineering Center (DMR-2011750), by Princeton University through the Princeton Catalysis Initiative, and by the Gordon and Betty Moore Foundation through Grant GBMF9064 to L.M.S. G.D.S. is a CIFAR Fellow in the Bio-Inspired Energy Program. D.F. was supported by the European Commission through the European Research Council (ERC), Project INCEPT, Grant 677488. Work by I.P. and P.N. is supported by the Quantum Science Center (QSC), a National Quantum Information Science Research Center of the U.S. Department of Energy (DOE). P.N. acknowledges support from a CIFAR BSE Catalyst Program that has facilitated interactions and collaborations with G.D.S. The authors also acknowledge the use of Princeton’s Imaging and Analysis Center, which is partially supported by the Princeton Center for Complex Materials, a National Science Foundation (NSF)–MRSEC program (DMR-2011750).
Publisher Copyright:
© 2023 American Chemical Society.
PY - 2023/1/12
Y1 - 2023/1/12
N2 - Time-resolved dynamics in charge-density-wave materials have revealed interesting out-of-equilibrium electronic responses. However, these are typically only performed in a single material possessing a CDW. As such, it is challenging to separate subtle effects originating from the CDW. Here, we report on the ultrafast dynamics of the GdSbxTe2-x-δ series of materials where EF can be tuned, resulting in a change from an undistorted tetraganal phase to a CDW with a wavevector that depends on x. Using mid-infrared, near-infrared, and visible excitation, we find the dynamics are sensitive to both EF and the presence of the CDW. Specifically, as the Sb content of the compounds increases, transient spectral features shift to higher probe energies. In addition, we observe an enhanced lifetime and change in the sign of the transient signal upon removing the CDW with high Sb concentrations. Finally, we reveal fluence- and temperature-dependent photoinduced responses of the differential reflectivity, which provide evidence of transient charge density wave suppression in related telluride materials. Taken together our results provide a blueprint for future ultrafast studies of CDW systems.
AB - Time-resolved dynamics in charge-density-wave materials have revealed interesting out-of-equilibrium electronic responses. However, these are typically only performed in a single material possessing a CDW. As such, it is challenging to separate subtle effects originating from the CDW. Here, we report on the ultrafast dynamics of the GdSbxTe2-x-δ series of materials where EF can be tuned, resulting in a change from an undistorted tetraganal phase to a CDW with a wavevector that depends on x. Using mid-infrared, near-infrared, and visible excitation, we find the dynamics are sensitive to both EF and the presence of the CDW. Specifically, as the Sb content of the compounds increases, transient spectral features shift to higher probe energies. In addition, we observe an enhanced lifetime and change in the sign of the transient signal upon removing the CDW with high Sb concentrations. Finally, we reveal fluence- and temperature-dependent photoinduced responses of the differential reflectivity, which provide evidence of transient charge density wave suppression in related telluride materials. Taken together our results provide a blueprint for future ultrafast studies of CDW systems.
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U2 - 10.1021/acs.jpcc.2c06120
DO - 10.1021/acs.jpcc.2c06120
M3 - Article
AN - SCOPUS:85146015673
SN - 1932-7447
VL - 127
SP - 577
EP - 584
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
IS - 1
ER -