Resonance-enhanced group delay times in an asymmetric single quantum barrier

• Published in: Optics communications Vol. 259; no. 1; pp. 158 - 163
• Main Authors: Li, Chun-Fang, Spieker, Harald
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.03.2006; Elsevier Science
• Subjects: Ballistic transport; Classical and quantum physics: mechanics and fields; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures; Electronic transport in mesoscopic systems; Exact sciences and technology; Foundations, theory of measurement, miscellaneous theories (including aharonov-bohm effect, bell inequalities, berry's phase); Group delay time; Physics; Quantum barrier; Quantum mechanics; Quantum well; Quasibound state; Resonance; Waveguide; Quantum barrier; Quantum well; Group delay time; 03.65.Xp; Resonance; 73.23.Ad; Waveguide; Quasibound state; Potential barrier; Microwave radiation; Quantum wells; Tunnel effect; Theoretical study; Quantum optics; 73.23.Ad Group delay time; Experimental device; Experimental study; Quasibound states; Optical waveguides; Near field optics; Quantum mechanics; Enhanced transmission; Group delay
• ISSN: 0030-4018; 1873-0310
• DOI: 10.1016/j.optcom.2005.08.028

It is shown that transmission and reflection group delay times in an asymmetric single quantum barrier are greatly enhanced by the transmission resonance when the energy of incident particles is larger than the height of the barrier. The resonant transmission group delay is of the order of the quasibound state lifetime in the barrier region. The reflection group delay can be either positive or negative, depending on the relative height of the potential energies on the two sides of the barrier. Its magnitude is much larger than the quasibound state lifetime. These predictions have been observed in microwave experiments.