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Updated: Oct 29, 2025
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Generation and Coherent Control of Pulsed Quantum Frequency Combs
Published on: June 8, 2018
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Optical manipulation of electronic dimensionality in a quantum material
Shaofeng Duan1, Yun Cheng2, Wei Xia3
1Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), Shenyang National Laboratory for Materials Science, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai, China.
Nature
|July 8, 2021
Summary
Researchers created transient two-dimensional (2D) electronic states in a 3D quantum material using laser pulses. This novel method offers a new pathway for discovering exotic phenomena in quantum materials.
Area of Science:
- Condensed Matter Physics
- Quantum Materials Science
- Ultrafast Spectroscopy
Background:
- Two-dimensional (2D) electronic systems enable exotic quantum phenomena like relativistic fermions and superconductivity.
- Conventional methods for creating 2D systems include material exfoliation, growth on substrates, or interface engineering.
Purpose of the Study:
- To explore an alternative method for creating transient 2D electronic states in quantum materials.
- To investigate the properties and dynamics of photoinduced 2D electronic states.
Main Methods:
- Utilizing femtosecond infrared laser pulses to induce sectional inversion of periodic lattice distortion in 3D charge density wave material (1T-TiSe2).
- Employing time-resolved and angle-resolved photoemission spectroscopy (TR-ARPES) and ultrafast electron diffraction (UED) to capture ultrafast dynamics.
Main Results:
- Macroscopic domain walls of transient 2D ordered electronic states were successfully created.
- A novel phase with an enhanced density of states and potential energy gap opening near the Fermi energy was identified in the photoinduced 2D domain wall.
- Ultrafast electronic and lattice dynamics were precisely captured.
Conclusions:
- Optical modulation of atomic motion provides a new route to realize 2D electronic states.
- This technique serves as a versatile platform for discovering novel quantum phases in materials.
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