.png){kind=icon}
.png){kind=icon}
Return
Algorithm for subcycle terahertz scanning tunneling spectroscopy
.png){kind=icon}
OA
AI
DOI：10.1103/PhysRevB.105.115427.png)
.png){kind=icon}
Original request for help.png){kind=icon}
Share.png){kind=icon}
Save
Abstract
En 中文
Terahertz scanning tunneling microscopy (THz-STM) enables ultrafast measurements of surfaces, single molecules, and nanostructures with simultaneous subpicosecond temporal resolution and atomic spatial resolution. In pump-probe THz-STM experiments employing femtosecond optical pump pulses, lightwave-driven tunneling by a time-delayed THz probe pulse accesses the evolving differential conductance of the tunnel junction following photoexcitation. However, a general theoretical approach to extract the time-and voltage dependent differential conductance from THz-STM measurements is lacking. Here, we introduce an algorithm for pump-probe THz scanning tunneling spectroscopy (THz-STS) analysis. Our approach allows us to reliably reconstruct the tunnel junction???s differential conductance in steady-state or time-dependent scenarios from simulated THz-STS data. The algorithm achieves subcycle time resolution, which we demonstrate by retrieving dynamics faster than the bandwidth of the input THz voltage transient. Subcycle THz-STS will make lightwavedriven microscopy yet more powerful as a tool for characterizing ??ngstr??m-scale ultrafast dynamics in novel materials.
Keywords:
SINGLE-MOLECULE
MICROSCOPY
JUNCTION
DRIVEN
MOTION