1887
banner image
No data available.
Please log in to see this content.
You have no subscription access to this content.
No metrics data to plot.
The attempt to load metrics for this article has failed.
The attempt to plot a graph for these metrics has failed.
Strain sensing and far-infrared absorption in strained graphene quantum dots
Rent:
Rent this article for
USD
10.1063/1.4818708
/content/aip/journal/jap/114/7/10.1063/1.4818708
http://aip.metastore.ingenta.com/content/aip/journal/jap/114/7/10.1063/1.4818708

Figures

Image of FIG. 1.
FIG. 1.

Structure of a TZGQD. ( = 1, 2, 3) indicate the lattice vectors. Solid and open circles distinguish the two sublattices in the honeycomb lattice. Here, equals 6. A denotes one of the edge atoms.

Image of FIG. 2.
FIG. 2.

(a)–(c) are the energy level diagrams of the TZGQD with for the uniaxial strain , the uniaxial strain along the zigzag direction and the uniaxial strain along the armchair direction, respectively. The irreducible representations of the levels are labeled in the figures. (d) and (e) plot the jointed density of state and the optical absorption spectrum of the unstrained TZGQD. (f)–(h) plot the jointed density of state, the optical absorption spectrum and of the TZGQD for the strain along the zigzag direction. (i), (j), and (k) are the same as (f), (g), and (h), but for the strain along the armchair direction. Here, we use a Lorentz function with a broadening factor of 0.05 eV. To be clear, some levels are plotted with the dashed lines.

Image of FIG. 3.
FIG. 3.

Energy spectra of the TZGQD with as functions of the uniaxial strain η along the zigzag direction in (a) and along the armchair direction in (c). (b) and (d), respectively, plot the band gaps of (a) and (c) versus η.

Image of FIG. 4.
FIG. 4.

(a)–(c), respectively, plot the joint density of states, the optical absorption spectra and of the TZGQD with for the different strains η along the zigzag direction. (d), (e), and (f) are the same as (a), (b), and (c), but when the uniaxial strain is along the armchair direction. In (b), (c), (e), and (f), the redshift can be observed with the tensile strain increasing and the blueshift can be observed with the compressive strain increasing. The baseline of each curve in the figures is shifted vertically.

Image of FIG. 5.
FIG. 5.

Optical absorption spectra of the TZGQD with in (a) and (b), in (c) and (d), and in (e) and (f). Thereinto, (a), (c), (e) are for and (b), (d), (f) are for . Here, the strain is along the armchair direction. (g) and (h), respectively, plot the peak shifts and versus the strain applied along the armchair direction, reflecting the sensitivity of the TZGQD strain sensor for four different sizes.

Image of FIG. 6.
FIG. 6.

(a) and (b) are the optical absorption spectra and of a TZGQD with the size introduced a vacancy defect at site , as shown in Fig. 1 , when the strain is along the armchair direction. The redshift and the blueshift effects of the main absorption peaks can be still observed clearly.

Image of FIG. 7.
FIG. 7.

The optical absorption spectra of the TZGQD with are, respectively, plotted (a) for no strain and , (b) for a uniaxial tensile strain along the armchair direction and , (c) for a uniaxial tensile strain along the armchair direction and . The energy spectrum (d), (e), and (f), respectively, correspond to (a), (b), and (c). The irreducible representations of the levels are labeled in the figures. The dashed line in (f) indicates the position of the Fermi energy.

Tables

Generic image for table
Table I.

The character tables of and , which are adopted from Ref. .

Loading

Article metrics loading...

/content/aip/journal/jap/114/7/10.1063/1.4818708
2013-08-20
2014-04-24
Loading

Full text loading...

This is a required field
Please enter a valid email address
752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Strain sensing and far-infrared absorption in strained graphene quantum dots
http://aip.metastore.ingenta.com/content/aip/journal/jap/114/7/10.1063/1.4818708
10.1063/1.4818708
SEARCH_EXPAND_ITEM