Results 61 to 70 of about 392,529 (145)

Bound states in the continuum in PT-symmetric optical lattices [PDF]

, 2014
Bound states in the continuum (BIC), i.e. normalizable modes with an energy embedded in the continuous spectrum of scattered states, are shown to exist in certain optical waveguide lattices with $\mathcal{PT}$-symmetric defects. Two distinct types of BIC
Longhi, Stefano
core   +1 more source

Ultrahigh Q-Guided Resonance Sensor Empowered by Near Merging Bound States in the Continuum

Photonics, 2022
Bound states in the continuum (BICs) have attracted a lot of interest in the field of nanophotonics, and provide an important physical mechanism to realize high quality (Q) factor resonance.
Zhiran Liu, Yi Zhou, Zhihe Guo, Xuyang Zhao, Man Luo, Yuxiang Li, Xiang Wu   +6 more
doaj   +1 more source

Magnetic excitation spectrum of dimerized antiferromagnetic chains

, 1996
Motivated by recent measurements on CuGeO$_3$ the spectrum of magnetic excitations of an antiferromagnetic $S=\frac{1}{2}$ chain with alternating coupling strength is investigated.
A. B. Harris, A. Luther, A. M. Tsvelik, F. D. M. Haldane, F. D. M. Haldane, G. Castilla, G. Müller, G. Spronken, Götz S. Uhrig, H. A. Bethe, H. Bergknoff, H. J. Schulz, H. J. Schulz, I. Affleck, J. C. Bonner, J. P. Pouget, J. Riera, K. Hirota, L. D. Faddeev, L. P. Regnault, M. C. Cross, M. C. Martin, M. Hase, M. Nishi, P. Fulde, P. Jordan, R. Chitra, S. Haas, Z. G. Soos   +28 more
core   +1 more source

Exceptional points at bound states in the continuum in photonic integrated circuits

Nanophotonics, 2022
We propose the realization of exceptional points (EP) at bound states in the continuum (BIC), with two coupled strips, made of an electron-beam resist and patterned on the thin film photonic integrated platform, which makes possible etchless photonics ...
Qin Haoye, Shi Xiaodong, Ou Haiyan
doaj   +1 more source

The Absence of Positive Energy Bound States for a Class of Nonlocal Potentials

, 2004
We generalize in this paper a theorem of Titchmarsh for the positivity of Fourier sine integrals. We apply then the theorem to derive simple conditions for the absence of positive energy bound states (bound states embedded in the continuum) for the ...
Chadan K, Erdélyi A, Erdélyi A, Galindo A, Gourdin M, Khosrow Chadan, Newton R G, Reido Kobayashi, Royden H L, Simon B, Sneddon I N, Titchmarch E C, Titchmarsh E C, Valiron G, Zirilli F   +14 more
core   +2 more sources

Bound states in the continuum in open acoustic resonators

, 2015
We consider bound states in the continuum (BSC) or embedded trapped modes in two- and three-dimensional acoustic axisymmetric duct-cavity structures. We demonstrate numerically that under variation of the length of the cavity multiple BSCs occur due to ...
Lyapina, A. A., Maksimov, D. N., Pilipchuk, A. S., Sadreev, A. F.   +3 more
core   +1 more source

A hierarchy of bound states in the 1D ferromagnetic Ising chain CoNb$_2$O$_6$ investigated by high resolution time-domain terahertz spectroscopy

, 2014
Kink bound states in the one dimensional ferromagnetic Ising chain compound CoNb$_2$O$_6$ have been studied using high resolution time-domain terahertz spectroscopy in zero applied magnetic field.
Aguilar, R. Valdés, Armitage, N. P., Cava, R. J., Ghosh, A., Koohpayeh, S. M., Krizan, J., McQueen, T. M., Morris, C. M., Tchernyshyov, O.   +8 more
core   +1 more source

Finite-well potential in the 3D nonlinear Schroedinger equation: Application to Bose-Einstein condensation

, 2007
Using variational and numerical solutions we show that stationary negative-energy localized (normalizable) bound states can appear in the three-dimensional nonlinear Schr\"odinger equation with a finite square-well potential for a range of nonlinearity ...
Abdullaev, Adhikari, Adhikari, Adhikari, Adhikari, Adhikari, Adhikari, Carr, Carr, Carr, Dalfovo, Greiner, Hakim, Hasegawa, Inouye, Kevrekidis, Kivshar, Leboeuf, Muga, Muruganandam, S. K. Adhikari, Seaman, Zakharov   +22 more
core   +1 more source

Ultra-Sensitive Refractive Index Sensing Based on Quasi-BICs in All-Dielectric Nanorod Array

Photonics
We propose an all-dielectric nanorod array for ultra-sensitive refractive index sensing based on quasi-bound states in the continuum (BICs). The nanorod is fabricated by silicon or silicon with an air hole, i.e., the hollow silicon nanorod.
Yuefeng Zhao, Zhenghua Wu, Zhihao Feng, Tingyin Ning   +3 more
doaj   +1 more source

Rigorous conditions for the existence of bound states at the threshold in the two-particle case

, 2006
In the framework of non-relativistic quantum mechanics and with the help of the Greens functions formalism we study the behavior of weakly bound states as they approach the continuum threshold.
Courant R, Dmitry K Gridnev, Gridnev D K, Hoffmann-Ostenhof M, Hogreve H, Hogreve H, Hogreve H, Lieb E H, Martin E Garcia, Newton R, Reed M, Riisager K, Simon B, Simon B, Zhislin G M, Zhizhenkova E F   +15 more
core   +1 more source