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Updated: Oct 12, 2025
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Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures
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Phase Diagram for Light-Induced Superconductivity in κ-(ET)_{2}-X
M Buzzi1, D Nicoletti1, S Fava1
1Max Planck Institute for the Structure and Dynamics of Matter, 22761 Hamburg, Germany.
Physical Review Letters
|November 19, 2021
Summary
Photoinduced superconductivity was observed in a specific organic material, κ-(bis(ethylenedithio)tetrathiafulvalene)₂Cu[N(CN)₂]Br. This effect requires proximity to a Mott insulating phase, suggesting unique conditions for transient superconductivity.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Organic Electronics
Background:
- Organic charge-transfer salts, such as κ-(bis(ethylenedithio)tetrathiafulvalene)₂Cu[N(CN)₂]Br, exhibit complex phase diagrams.
- Superconductivity in these materials can be influenced by external stimuli like optical excitation.
Purpose of the Study:
- To investigate the conditions necessary for photoinduced superconductivity in κ-(bis(ethylenedithio)tetrathiafulvalene)₂ (BEDT-TTF) based materials.
- To explore the role of the Mott insulating phase and superconducting fluctuations in achieving non-equilibrium superconductivity.
Main Methods:
- Optical excitation of molecular vibrations in κ-(BEDT-TTF)₂Cu[N(CN)₂]Br.
- Systematic studies across the bandwidth-tuned phase diagram of related materials, including Mott insulators and metallic compounds.
- Comparative analysis of photoinduced effects in κ-(BEDT-TTF)₂Cu[N(CN)₂]Cl and κ-(BEDT-TTF)₂Cu(NCS)₂.
Main Results:
- Transient superconductinglike optical properties were induced in κ-(BEDT-TTF)₂Cu[N(CN)₂]Br at elevated temperatures.
- Photoinduced superconductivity was exclusively observed in κ-(BEDT-TTF)₂Cu[N(CN)₂]Br, not in the studied Mott insulator or metallic compound.
- The presence of the Mott insulating phase and superconducting fluctuations are critical for this non-equilibrium phenomenon.
Conclusions:
- Proximity to the Mott insulating phase is a key prerequisite for observing photoinduced superconductivity in these organic materials.
- The findings highlight the delicate interplay between electronic correlations and external stimuli in achieving exotic quantum states.
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