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Title: Quantum Correlated Plasmons and Their Tunability in Undoped and Doped Mott-Insulator Cuprates
Authors: Xinmao Yin 
Chi Sin Tang 
Shengwei Zeng 
Teguh Citra Asmara 
Ping Yang 
M. Avicenna Naradipa
Paolo E. Trevisanutto 
Tomonori Shirakawa
Beom Hyun Kim
Seiji Yunoki
Mark B. H. Breese 
Thirumalai Venkatesan 
Andrew T. S. Wee
Ariando Ariando 
Andrivo Rusydi 
Keywords: collective excitations
high-Tc superconductor
ambipolar copper oxide
loss-function spectra
photon?electron interaction
spectroscopic ellipsometry
Issue Date: 9-Oct-2019
Citation: Xinmao Yin, Chi Sin Tang, Shengwei Zeng, Teguh Citra Asmara, Ping Yang, M. Avicenna Naradipa, Paolo E. Trevisanutto, Tomonori Shirakawa, Beom Hyun Kim, Seiji Yunoki, Mark B. H. Breese, Thirumalai Venkatesan, Andrew T. S. Wee, Ariando Ariando, Andrivo Rusydi (2019-10-09). Quantum Correlated Plasmons and Their Tunability in Undoped and Doped Mott-Insulator Cuprates. ACS Photonics 6 : 3281 - 3289. ScholarBank@NUS Repository.
Abstract: Plasmons, collective excitations of charge density, have attracted much interest in fundamental science and applications. While plasmons have been observed in metal-like phase of high-Tc superconductors, they have not been reported in the Mott-insulating form. Here, we report a new quantum correlated plasmons in ambipolar Y1–zLaz(Ba1–xLax)2Cu3Oy and optimal-doped YBa2Cu3O7–x using high-resolution spectroscopic ellipsometry. Interestingly, as functions of hole, electron-doping, and temperature, their dynamical loss-function and dielectric-functions exhibit formation of two plasmons at multiple ordered low- and high-photon energies due to on-site Cu3d Coulomb interaction and antibonding O2p–Cu3d. While the low-energy correlated plasmon transforms into a conventional-plasmon upon doping, the high-energy correlated plasmon remains. The intensity of these plasmons follows a mixture of singlet and triplet with decreasing temperature. Besides, their dephasing time decreases with increasing doping. Our result highlights the importance of charge-spin coupling in the correlated plasmons, which may potentially reveal a photon–electron interaction in the localized states of Mott-insulators.
Source Title: ACS Photonics
ISSN: 23304022
DOI: 10.1021/acsphotonics.9b01294
Appears in Collections:Staff Publications

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