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Cornertronics in Two-Dimensional Second-Order Topological Insulators.

Yilin Han1,2, Chaoxi Cui1,2, Xiao-Ping Li3

  • 1Centre for Quantum Physics, Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE), School of Physics, <a href="https://ror.org/01skt4w74">Beijing Institute of Technology</a>, Beijing 100081, China.

Physical Review Letters
|November 12, 2024
PubMed
Summary
This summary is machine-generated.

We introduce "cornertronics," a new field utilizing quantum dots from 2D topological insulators. These materials offer unique "corner freedom" for novel electronic devices.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Information

Background:

  • Traditional electronics use electron degrees of freedom (d.o.f.).
  • Emergent d.o.f., like valley, exist in some systems.
  • Topological insulators offer novel electronic properties.

Purpose of the Study:

  • To explore a new degree of freedom in quantum dots from 2D topological insulators.
  • To introduce and establish the concept of "cornertronics."
  • To identify and characterize materials suitable for cornertronics.

Main Methods:

  • Symmetry analysis
  • Materials search (identifying TiSiCO-family monolayers)
  • Theoretical investigation of corner states and their manipulation

Main Results:

  • Discovery of "corner freedom" in quantum dots from 2D second-order topological insulators.
  • Identification of TiSiCO-family monolayers as prototype cornertronics materials.
  • Demonstration of electric and optical control over corner states via corner-layer coupling and contrasted linear dichroism.
  • Terahertz (THz) band gap in TiSiCO nanodisks, robust to size reduction.
  • Sensitivity of TiSiCO nanodisks to THz wave strength and polarization.

Conclusions:

  • Cornertronics offers a new paradigm for information processing using topological corner states.
  • TiSiCO nanodisks are promising for ultrasmall, tunable THz devices.
  • This work opens new avenues in 2D topological insulators, quantum dots, and THz electronics.