Tunable magneto-optical properties in MoS2 via defect-induced exciton transitions

Tomer Amit, Daniel Hernangómez-Pérez, Galit Cohen, Diana Qiu, Sivan Refaely-Abramson

פרסום מחקרי: פרסום בכתב עתמאמרביקורת עמיתים

תקציר

The presence of chalcogen vacancies in monolayer transition metal dichalcogenides (TMDs) leads to excitons with mixed localized-delocalized character and to reduced valley selectivity. Recent experimental advances in defect design in TMDs allow for a close examination of such mixed exciton states as a function of their degree of circular polarization under external magnetic fields, revealing strongly varying defect-induced magnetic properties. A theoretical understanding of these observations and their physical origins demands a predictive, structure-sensitive theory. In this work, we study the effect of chalcogen vacancies on the exciton magnetic properties in monolayer MoS2. Using many-body perturbation theory, we show how the complex excitonic picture associated with the presence of defects—with reduced valley and spin selectivity due to hybridized electron-hole transitions—leads to a structurally controllable exciton magnetic response. We find a variety of g-factors with changing magnitudes and sign depending on the exciton energy and character. Our findings suggest a pathway to tune the nature of the excitons—and by that their magneto-optical properties—through defect architecture.
שפה מקוריתאנגלית
מספר המאמרL161407
מספר עמודים6
כתב עתPhysical review. B
כרך106
מספר גיליון16
מזהי עצם דיגיטלי (DOIs)
סטטוס פרסוםפורסם - 15 אוק׳ 2022

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