Ultrafast Carrier Dynamics in Graphene Systems
Summary
Graphene’s unique band structure and linear energy–momentum dispersion endow its charge carriers with exceptionally rapid response times, giving rise to ultrafast phenomena that unfold on femtosecond to picosecond timescales. Upon photoexcitation, an initially non-equilibrium distribution of electrons and holes is established, which thermalises through efficient carrier–carrier scattering before cooling via emission of optical and acoustic phonons. The interplay between these processes dictates the temporal evolution of the electronic temperature and conductivity, with significant implications for high-speed optoelectronics, terahertz generation and quantum information technologies. Understanding and controlling these dynamics is crucial for engineering devices that exploit graphene’s high mobility, tunable carrier density and strong light–matter interactions in applications ranging from photodetectors to nanoscale light sources and ultrafast switches.
Research from Nature Portfolio
Recent studies have revealed that ultrashort optical pulses can induce directional currents within graphene on nanometre scales, enabling vectorial control of charge flow and broadband terahertz emission. Investigations of energy transfer at solid–liquid interfaces demonstrate that resonance between graphene surface plasmons and water hydrons accelerates electron cooling by enhancing thermal boundary conductance. Foundational work has further elucidated sub-100 fs carrier dynamics in suspended graphene, showing that collinear scattering and Auger processes drive rapid thermalisation and charge multiplication, thereby underpinning the efficiency of photodetectors and energy-harvesting schemes.
Ultrafast Carrier Dynamics in Graphene Systems publication trend
The graph below shows the total number of articles in ultrafast carrier dynamics in graphene systems across all publications each year (not limited to Nature Index journals).
Technical terms
Dirac fermion: Charge carrier in graphene behaving as a massless particle with linear energy–momentum dispersion.
Pump–probe spectroscopy: Ultrafast technique using an initial light pulse to excite carriers and a delayed pulse to monitor relaxation dynamics.
Surface plasmon: Collective oscillation of free electrons at a material interface, excited by electromagnetic fields.
Hydron: Collective mode of charge fluctuations in liquid water involved in graphene interface cooling.
Carrier multiplication: Process in which high-energy carriers produce additional electron–hole pairs via scattering events.
References
- Light-driven nanoscale vectorial currents. Nature (2024).
- Electron cooling in graphene enhanced by plasmon–hydron resonance. Nature Nanotechnology (2023).
- Ultrafast collinear scattering and carrier multiplication in graphene. Nature Communications (2013).
- Electrically-driven ultrafast out-of-equilibrium light emission from hot electrons in suspended graphene/hBN heterostructures. International Journal of Extreme Manufacturing (2023).
- Hot carriers in graphene – fundamentals and applications. Nanoscale (2021).
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