Proceedings of September Meeting 2016 (NFM16)
Publication date: 14th June 2016
Connecting quantum dots into epitaxially connected superlattices is a new and exciting route to novel two-dimensional materials. The ability to control the atomic structure of the quantum dot building block (i.e., size, shape and composition) and the geometry of the superstructure creates fertile opportunity space to synthesize and study new classes of 2D materials. Theoretical calculations on these systems predict interesting phenomena including topological states and Dirac cones. We present recent advances in our group to fabricate atomically connected quantum dot superlattices with structural coherence approaching a single atomic bond length. Despite the high degree of structural coherence, surprisingly charge carriers are strongly localized, as shown by the first charge transport measurement in an atomically coherent quantum dot device. However, calculations that account for measured disorder confirm strong localization and predict complete delocalization with homogeneous epitaxial quantum dot connections. To better understand how polydispersity of the quantum dot building blocks impacts long-range order in the 2D assembly, we developed analytical methods to quantitatively characterize the propagating disorder in terms of a paracrystal model; this approach underscores the dramatic impact of angstrom scale translational disorder on structural correlations at hundreds of nanometers.
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