Browsing by Author "Alodjants, A. P."

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Exciton-polariton Josephson junctions at finite temperatures
(2017-08-25)
Lebedev, M. E.
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Dolinina, D. A.
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Hong, Kuo-Bin
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Lu, Tien-Chang
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Kavokin, A. V.
We consider finite temperature effects in a non-standard Bose-Hubbard model for an exciton-polariton Josephson junction (JJ) that is characterised by complicated potential energy landscapes (PEL) consisting of sets of barriers and wells. We show that the transition between thermal activation (classical) and tunneling (quantum) regimes exhibits universal features of the first and second order phase transition (PT) depending on the PEL for two polariton condensates that might be described as transition from the thermal to the quantum annealing regime. In the presence of dissipation the relative phase of two condensates exhibits non-equilibrium PT from the quantum regime characterized by efficient tunneling of polaritons to the regime of permanent Josephson or Rabi oscillations, where the tunneling is suppressed, respectively. This analysis paves the way for the application of coupled polariton condensates for the realisation of a quantum annealing algorithm in presently experimentally accessible semiconductor microcavities possessing high (105 and more) Q-factors.
Tuning the Characteristics of Surface Plasmon Polariton Nanolasers by Tailoring the Dispersion Relation
(2017-01-01)
Lu, Tien-Chang
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Chou, Yu-Hsun
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Hong, Kuo-Bin
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Chung, Yi-Cheng
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Lin, Tzy-Rong
Nanolasers with ultra-compact footprint are able to provide high intensity coherent light, which have various potential applications in high capacity signal processing, biosensing, and sub-wavelength imaging. Among various nanolasers, those lasers with cavities surrounded with metals have shown to have superior light emission properties due to the surface plasmon effect providing better field confinement capability and allowing exotic light-matter interaction. In this talk, we report robust ultraviolet ZnO nanolaser by using silver (Ag) [1] and aluminum (Al) [2] to strongly shrink the mode volume. The nanolasers operated at room temperature and even high temperature (353K) shows several distinct features including an extremely small mode volume, large Purcell factor and group index. Comparison of characteristics between Ag-and Al-based will also be made.