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Communication Dans Un Congrès Année : 2014

Preparation and study of 2-D semiconductors with Dirac type bands due to the honeycomb nanogeometry

Résumé

The interest in 2-dimensional systems with a honeycomb lattice and related Dirac-type electronic bands has exceeded the prototype graphene. We show that atomically coherent honeycomb superlattices of rocksalt (PbSe, PbTe) and zincblende (CdSe, CdTe) semiconductors can be obtained by nanocrystal self-assembly and subsequent cation exchange. These artificial graphene systems combine Dirac-type electronic bands with the beneficial properties of a semiconductor, such as the presence of a band gap and strong spin-orbit coupling; separated conduction 1S and 1P Dirac cones of considerable bandwidth (100 meV) are predicted, as well as dispersionless P-bands. We will also present the first experimental results dealing with the band structure (obtained by cryogenic STM) and the first carrier transport measurements and discuss possible applications of these high-mobility systems in single-photon detection and photovoltaic cells.

Dates et versions

hal-00964400 , version 1 (24-03-2014)

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Efterpi Kalesaki, Mark Pieter Boneschanscher, Jaco J. Geuchies, Christophe Delerue, Cristiane Morais Smith, et al.. Preparation and study of 2-D semiconductors with Dirac type bands due to the honeycomb nanogeometry. SPIE Photonics West, OPTO 2014, Conference 8981 - Physics, Simulation, and Photonic Engineering of Photovoltaic Devices III, 2014, San Francisco, CA, United States. ⟨10.1117/12.2042882⟩. ⟨hal-00964400⟩
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