High harmonic generation governed by edge states in triangular graphene quantum dots

Gnawali, Suresh; Apalkov, Vadym

doi:10.1103/physrevb.108.115434

High harmonic generation governed by edge states in triangular graphene quantum dots

Journal Article · Wed Sep 27 00:00:00 EDT 2023 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.108.115434· OSTI ID:2418934

^[1]; Apalkov, Vadym ^[2]

Georgia State Univ., Atlanta, GA (United States); OSTI
Georgia State Univ., Atlanta, GA (United States)

Here, we study theoretically interaction of short optical pulses with triangular graphene quantum dots. If such quantum dots have zigzag edges then there are in-gap degenerate edge states, the number of which depends on the size of the system. We show that the nonlinear optical response, such as high harmonic generation, of triangular quantum dots is sensitive to the initial electron population of their edge states. In general, the emission spectra of quantum dots have weak dependence on the number of occupied edge states, but if half of the edge states are initially occupied, which can be realized only in the quantum dots with even number of edge states, then the even high harmonics are strongly suppressed. The suppression is the strongest when the frequency of the pulse is well below the band gap and it is weak when the pulse frequency becomes comparable to the band gap of the system.

View Accepted Manuscript (DOE)

Research Organization:: Georgia State Univ., Atlanta, GA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB)

Grant/Contract Number:: FG02-01ER15213; SC0007043

OSTI ID:: 2418934

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 11 Vol. 108; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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