Variational density matrix approach to the temperature-dependent elementary excitation spectrum of two-dimensional liquid4He

1996 ◽  
Vol 102 (3-4) ◽  
pp. 307-324
Author(s):  
Chung-In Um ◽  
Jae-Rok Kahng ◽  
Kyu-Hwang Yeon ◽  
Thomas F. George
Keyword(s):  
Density Matrix ◽  
Excitation Spectrum ◽  
Elementary Excitation ◽  
Two Dimensional ◽  
Matrix Approach ◽  
Temperature Dependent ◽  
Elementary Excitation Spectrum

Effects of external fields on the optical absorption of quantum multirings

2020 ◽  
Vol 34 (17) ◽  
pp. 2050153
Author(s):  
S. Ghajarpour-Nobandegani ◽  
V. Ashrafi-Dalkhani ◽  
M. J. Karimi
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Magnetic Fields ◽  
Optical Absorption ◽  
Density Matrix ◽  
Two Dimensional ◽  
Matrix Approach ◽  
Energy Eigenvalues ◽  
Electric And Magnetic Fields ◽  
Dimensional Finite Element

In this paper, the effects of the electric and magnetic fields on the optical absorption of GaAs/AlGaAs quantum multirings were studied. Using the two-dimensional finite element method, energy eigenvalues and wavefunctions were calculated, and optical absorption was obtained by the density matrix approach. The result showed that optical absorption increases with increasing number and size of the rings.

On a structure of superfluid helium-4 elementary excitation spectrum

1994 ◽  
Vol 194-196 ◽  
pp. 545-546 ◽  
Author(s):  
Nikolay M. Blagoveshchenskii ◽  
Ilia V. Bogoyavlenskii ◽  
Leonid V. Karnatsevich ◽  
Zhorzhik A. Kozlov ◽  
Victor G. Kolobrodov ◽  
...  
Keyword(s):  
Excitation Spectrum ◽  
Superfluid Helium ◽  
Elementary Excitation ◽  
Helium 4 ◽  
Elementary Excitation Spectrum
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