Control of valley polarization in gapped graphene by linearly polarized ultrashort optical pulse

Journal Article · 16 February 2022 · Physica. E, Low-Dimensional Systems and Nanostructures

DOI: https://doi.org/10.1016/j.physe.2022.115145 · OSTI ID:1977550

Kumar, Pardeep ^[1]; Herath, Thakshila M. ^[2]; Motlagh, S. Azar Oliaei ^[2]; Apalkov, Vadym ^[2]

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1. Georgia State University, Atlanta, GA (United States); Michigan State University, East Lansing, MI (United States); OSTI
2. Georgia State University, Atlanta, GA (United States)

We present a versatile model of gapped graphene to manipulate valley polarization by using ultrafast linearly polarized pulses of zero areas. First, a circularly polarized pulse of a single oscillation produces a valley-selective population of the conduction band by means of topological resonance. Then we apply a linearly polarized femtosecond-long pulse that changes the valley polarization. The magnitude of such a change depends on the amplitude and the direction of polarization of the pulse. In conclusion, our protocol provides a favorable platform for applications in valleytronics.

• Research Organization: Georgia State University, Atlanta, GA (United States)
• Sponsoring Organization: National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB)
• Grant/Contract Number: FG02-01ER15213; SC0007043
• OSTI ID: 1977550
• Journal Information: Physica. E, Low-Dimensional Systems and Nanostructures, Journal Name: Physica. E, Low-Dimensional Systems and Nanostructures Journal Issue: C Vol. 140; ISSN 1386-9477
• Publisher: ElsevierCopyright Statement
• Country of Publication: United States
• Language: English