Chemical vapor deposition of MoS₂ on distributed Bragg reflector for room temperature polariton condensation




Bodemann, Isaac Michael

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The creation of a room temperature Bose Einstein Condensate has been the goal of much research since the phenomenon was first experimentally realized in 1995. Currently, polaritons stand out as a particularly viable option to achieve this goal as their low effective mass should in theory allow for a high condensation temperature. One proposed system to realize such a condensate is a semiconductor optical microcavity. In a semiconductor microcavity distributed Bragg reflectors (DBR) are used to trap photons in the cavity, while a direct band gap semiconductor placed in the cavity would allow for the creation of excitons for those photons to couple with. In this work we explore the growth of crystalline monolayer Molybdenum Disulfide (MoS₂) directly onto the DBR to create such a microcavity. Growth of MoS₂ is well studied, however the DBR substrate presents unique challenges as the surface is inconducive for crystalline growth and the substrate itself warps and deteriorates at high temperatures. We then present techniques to overcome these challenges and recipes by which large area growth of monolayer MoS₂ growth on DBR can be attained.


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