Efficient ionization of two-dimensional excitons by intense single-cycle terahertz pulses

Høgni C. Kamban, Thomas G. Pedersen

Research output: Contribution to journalArticlepeer-review


External electric fields are highly attractive for dynamical manipulation of excitons in two-dimensional materials. Here, we theoretically study the ionization of excitons in monolayer transition metal dichalcogenides (TMDs) by intense pulsed electric fields in the terahertz (THz) regime. We find that THz pulses with realistic field strengths are capable of ionizing a significant fraction of photogenerated excitons in TMDs into free charge carriers. Short THz pulses are therefore an efficient, noninvasive method of dynamically controlling the free carrier concentration in monolayer TMDs, which is useful for applications such as THz modulators. We further demonstrate that exciton ionization probabilities should be experimentally measurable by comparing free carrier absorption before and after the THz pulse. Detailed results are provided for different TMDs in various dielectric environments.
Original languageEnglish
Article number235305
Number of pages11
JournalPhysical review B
Issue numberIss. 23 — 15 December 2021
Publication statusPublished - 20 Dec 2021


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