A New Spin-Correlated Plasmon in Novel Highly Oriented Single-Crystalline Gold Quantum Dots

Bin Leong Ong, Muhammad Avicenna Naradipa, Angga Dito Fauzi, Muhammad Aziz Majidi, Caozheng Diao, Satoshi Kurumi, Pranab Kumar Das, Chi Xiao, Ping Yang, Mark B.H. Breese, Sheau Wei Ong, Khay Ming Tan, Eng Soon Tok, Andrivo Rusydi

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

A concept of spin plasmon, a collective mode of spin-density, in strongly correlated electron systems has been proposed since the 1930s. It is expected to bridge between spintronics and plasmonics by strongly confining the photon energy in the subwavelength scale within single magnetic-domain to enable further miniaturizing devices. However, spin plasmon in strongly correlated electron systems is yet to be realized. Herein, we present a new spin correlated-plasmon at room temperature in novel Mott-like insulating highly oriented single-crystalline gold quantum-dots (HOSG-QDs). Interestingly, the spin correlated-plasmon is tunable from the infrared to visible, accompanied by spectral weight transfer yielding a large quantum absorption midgap state, disappearance of low-energy Drude response, and transparency. Supported with theoretical calculations, it occurs due to an interplay of surprisingly strong electron-electron correlations, s-p hybridization and quantum confinement in the s band. The first demonstration of the high sensitivity of spin correlated-plasmon in surface-enhanced Raman spectroscopy is also presented.

Original languageEnglish
Pages (from-to)7448-7456
Number of pages9
JournalNano Letters
Volume21
Issue number18
DOIs
Publication statusPublished - 22 Sep 2021

Keywords

  • electron-correlation
  • gold
  • highly oriented
  • quantum-confinement
  • quantum-dots
  • self-organized
  • spin-polarization

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