| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Bound in continuum states and induced transparency in mesoscopic demultiplexer with two outputs |
| Z Labdouti1, T Mrabti2,†, A Mouadili3, E H El Boudouti1, F Fethi1, and B Djafari-Rouhani4 |
| 1 LPMR, Dèpartement de Physique, Facultè des Sciences, Universitè Mohammed I, Oujda, Morocco; 2 LSTA, Dèpartement de Physique, Facultè Polydisciplinaire de Larache, Universitè Abdelmalek Essaadi, Tètouan, Morocco; 3 LPMCER, Dèpartement de Physique, Facultè des Sciences et Techniques de Mohammedia, Universitè Hassan II, Casablanca, Morocco; 4 IEMN, UMR CNRS 8520, UFR de Physique, Universitè de Lille, 59655 Villeneuve d'Ascq, France |
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Abstract We investigate the electronic transport in a simple mesoscopic cross structure made of two wires (stubs) grafted at the same point along a quantum waveguide. We show that the structure may exhibit important phenomena such as bound in continuum (BIC) states. These states are transformed into electromagnetically induced transparency (EIT) resonance by detuning slightly the lengths of the stubs. The last phenomenon is used to propose and study a mesoscopic demultiplexer device with an input waveguide and two output waveguides. We give closed-form expressions of the geometrical parameters that allow a selective transfer of a given state in the first waveguide without perturbing the second waveguide. The effect of temperature on the transmission resonances is also examined by using Landauer-Büttiker formula. The analytical results of the dispersion relation and transmission and reflection coefficient are obtained using the Green's function method.
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Received: 31 May 2020
Revised: 21 July 2020
Accepted manuscript online: 07 August 2020
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PACS:
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73.21.-b
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(Electron states and collective excitations in multilayers, quantum wells, mesoscopic, and nanoscale systems)
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73.63.-b
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(Electronic transport in nanoscale materials and structures)
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73.20.At
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(Surface states, band structure, electron density of states)
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Corresponding Authors:
†Corresponding author. E-mail: t.mrabti@yahoo.fr
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Cite this article:
Z Labdouti, T Mrabti, A Mouadili, E H El Boudouti, F Fethi, and B Djafari-Rouhani Bound in continuum states and induced transparency in mesoscopic demultiplexer with two outputs 2020 Chin. Phys. B 29 127301
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