Plasmon modes in BLG-GaAs Double-Layer Structures: Temperature Effects

Author(s):  
Van-Men Nguyen ◽  
Kim-Phuong Thi Dong
2012 ◽  
Vol 22 (1) ◽  
pp. 45-51 ◽  
Author(s):  
Dinh Van Tuan ◽  
Nguyen Quoc Khanh

We calculate the dynamical dielectric function of doped double-layer graphene (DLG), made of two parallel graphene monolayers with carrier densities \(n_1, n_2\), respectively, and a separation interlayer of \(d\) at finite temperature. The results are used to find the dispersion of plasmon modes. We study the temperature effects on the DLG plasmon modes in the case of symmetric system \((n_1=n_2)\), asymmetric system \((n_1\neq n_2)\) and no free carriers in the second layer \((n_2=0)\). We show that the effect of temperature on the plasmon dispersion is significant and can not be ignored in investigating graphene properties.


2002 ◽  
Vol 57 (6-7) ◽  
pp. 419-424 ◽  
Author(s):  
Sadamu Takeda ◽  
Yuko Gotoh ◽  
Goro Maruta ◽  
Shuichi Takahara ◽  
Shigeharu Kittaka

The rotational behavior of the interlayer water molecules of deuterated vanadium pentoxide hydrate, V2O5.nD2O, was studied by solid-state deuterium NMR for the mono- and double-layer structures of the adsorbed water molecules. The rotational motion was anisotropic even at 355 K for both the mono- and double-layer structures. The 180° flipping motion about the C2-symmetry axis of the water molecule and the rotation around the figure axis, which makes an angle Ɵ with the C2-axis, occurred with the activation energy of (34±4) and (49±6) kJmol-1, respectively. The activation energies were almost independent of the mono- and double-layer structures of the water molecules, but the angle Ɵ made by the two axes varied from 33° for the monolayer to 25° for the double-layer at 230 K. The angle started to decrease above 250 K (e. g. the angle was 17 at 355 K for the double-layer structure). The results indicate that the average orientation of the water molecules in the two dimensional interlayer space depends on the layer structure and on the temperature. From the deuterium NMR spectrum at 130 K, the quadrupole coupling constant e2Qq/h = 240 kHz and the asymmetry parameter η= 0.12 were deduced. These values indicate the average hydrogen bond distance R(O H) = 2.0 Å for the D2O molecules in the 2D-interlayer space


2018 ◽  
Vol 123 (17) ◽  
pp. 174301 ◽  
Author(s):  
S. Saberi-Pouya ◽  
T. Vazifehshenas ◽  
M. Saleh ◽  
M. Farmanbar ◽  
T. Salavati-fard

1987 ◽  
Vol 122 ◽  
pp. 187-188
Author(s):  
K.-H. Böhm ◽  
A. C. Raga ◽  
J. Solf

We discuss four different tests of the bow-shock theory of Herbig-Haro objects, emphasizing especially tests based on position-velocity diagrams and on the appearance of “double layer” structures in the spatial maxima of the high- and low-velocity components of the emission lines. Though this latter effect is surprising, it is a fundamental consequence of the bow shock theory.


2002 ◽  
Author(s):  
A. Lian ◽  
L. Martinu ◽  
J.E. Klemberg-Sapieha ◽  
M.R. Wertheimer

2017 ◽  
Vol 35 (10) ◽  
pp. 1971-1979 ◽  
Author(s):  
Jian-Ping Liu ◽  
Xiang Zhai ◽  
Fang Xie ◽  
Ling-Ling Wang ◽  
Sheng-Xuan Xia ◽  
...  

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