Magnetic field dependence of electronic properties of MoS$_2$ quantum dots with different edges

TL;DR

This study explores how magnetic fields influence the electronic properties of MoS₂ quantum dots with various edge geometries, revealing robust ring states and Aharonov-Bohm oscillations that depend on dot size.

Contribution

It introduces the concept of ring states in MoS₂ quantum dots and analyzes their magnetic field dependence, including oscillations and their relation to quantum dot size.

Findings

Ring states are present in MoS₂ quantum dots with different edges.

Energy levels exhibit Aharonov-Bohm oscillations under magnetic fields.

Oscillation characteristics vary with quantum dot size.

Abstract

Using the tight-binding approach, we investigate the energy spectrum of square, triangular and hexagonal MoS$_2$ quantum dots (QDs) in the presence of a perpendicular magnetic field. Novel edge states emerge in MoS$_2$ QDs, which are distributed over the whole edge which we call ring states. The ring states are robust in the presence of spin-orbit coupling (SOC). The corresponding energy levels of the ring states oscillate as function of the perpendicular magnetic field which are related to Aharonov-Bohm oscillations. Oscillations in the magnetic field dependence of the energy levels and the peaks in the magneto-optical spectrum emerge (disappear) as the ring states are formed (collapsed). The period and the amplitude of the oscillation decreases with the size of the MoS$_2$ QDs.