Optoelectronics

Steering electrons in graphene

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Science  07 Dec 2018:
Vol. 362, Issue 6419, pp. 1125-1126
DOI: 10.1126/science.362.6419.1125-e

Guiding and controlling the movement of electrons in solid-state systems is crucial for applications such as ultrafast electronics and the generation of high-harmonic light. Although such electronic control is readily achieved in semiconductors, metals and small-bandgap materials can pose more of a challenge. Heide et al. show that they can control the trajectory of electrons within the two-dimensional plane of graphene using a double pulse from a laser. Tuning the relative polarization between the two pulses by carefully varying the time delay between them allows the direction electron flow to be manipulated on femtosecond time scales. Such an optical technique offers a relatively simple route to study the electronic and topological properties of other two-dimensional materials on ultrafast time scales.

Phys. Rev. Lett. 121, 207401 (2018).

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