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Strain relaxation, band-structure deformation, and optical absorption in free-hanging quantum-well microstructures
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10.1063/1.1906287
/content/aip/journal/jap/97/11/10.1063/1.1906287
http://aip.metastore.ingenta.com/content/aip/journal/jap/97/11/10.1063/1.1906287

Figures

Image of FIG. 1.
FIG. 1.

Multiple quantum-well microbridge. The structure is about long by wide by thick.

Image of FIG. 2.
FIG. 2.

Multiple quantum-well microcantilevers. Each structure is about long by wide by thick.

Image of FIG. 3.
FIG. 3.

Strain tensor values in the layers (lattice matched, top) and in the layers (bottom) of microcantilevers as a function of the fraction of the heterostructure occupied by the layers. The data points are from finite-element modeling of elastic strain relaxation, whereas the lines are from Eqs. (12) and (13).

Image of FIG. 4.
FIG. 4.

Strain tensor values in the layers (top) and in the layers (bottom) of a [100] microbridge as a function of the fraction of the heterostructure occupied by material . For this data, , and . The data points are from finite-element modeling of elastic strain relaxation, whereas the lines are from Eqs. (24) and (25).

Image of FIG. 5.
FIG. 5.

Strain tensor values in the layers (top) and in the layers (bottom) of a [110] microbridge as a function of the fraction of the heterostructure occupied by material . For this data, , and . The data points are from finite-element modeling of elastic strain relaxation, whereas the lines are from Eqs. (24) and (25).

Image of FIG. 6.
FIG. 6.

Strain tensor values in the layers (top) and in the layers (bottom) of a micro-bridge as a function of the in-plane angle of the microbridge, . For this data, , and . The data points are from finite-element modeling of elastic strain relaxation, whereas the lines are from Eqs. (24) and (25).

Image of FIG. 7.
FIG. 7.

Optical setup for spatially resolved differential transmission spectroscopy. PM: polarization maintaining. HWP: half-wave plate. LP: linear polarizer. BS: beam splitter. OBJ: objective. CL: collection lens. PD: photodiode.

Image of FIG. 8.
FIG. 8.

Quantum-well strains in an unetched area, in a [100] microbridge, and in a microcantilever (left to right) from Eq. (25) and (13).

Image of FIG. 9.
FIG. 9.

Blueshift and anisotropy in the heavy-hole and light-hole excitonic transitions in a [100] microbridge in sample T-A.

Image of FIG. 10.
FIG. 10.

Blueshift in the heavy-hole and light-hole excitonic transitions in a microcantilever in sample T-A. Here, , the measured HH blueshift is , and the calculated blueshift is (compare to Fig. 9).

Image of FIG. 11.
FIG. 11.

Blueshift in the heavy-hole excitonic transition in a microcantilever in sample T-B. Here, , the measured HH1-C1 blueshift is , and the calculated blueshift is (compare to Fig. 10).

Image of FIG. 12.
FIG. 12.

Blueshift in the heavy-hole excitonic transition in a microcantilever in sample T-C. Here, , the measured HH1–C1 blueshift is , and the calculated blueshift is (compare to Fig. 10 and 11).

Image of FIG. 13.
FIG. 13.

Redshift and anisotropy in the heavy-hole and light-hole excitonic transitions in a [100] microbridge in sample C-A (compare to Fig. 9).

Image of FIG. 14.
FIG. 14.

Redshift in the HH1–C1 and LH1–C1 excitonic transitions in a microcantilever in sample C-A (compare to Fig. 10 and 13).

Tables

Generic image for table
Table I.

Barriers used with quantum wells in this work.

Generic image for table
Table II.

Deformation potentials used in this work (eV).

Generic image for table
Table III.

Measured and calculated blueshifts (compared to as grown) in various microstructures for sample T-A.

Generic image for table
Table IV.

Measured and calculated HH1–C1 blueshifts (compared to as grown) in microcantilevers for tensile-barrier samples.

Generic image for table
Table V.

Measured and calculated redshifts (compared to as grown) in various microstructures for sample C-A.

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/content/aip/journal/jap/97/11/10.1063/1.1906287
2005-06-07
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Strain relaxation, band-structure deformation, and optical absorption in free-hanging quantum-well microstructures
http://aip.metastore.ingenta.com/content/aip/journal/jap/97/11/10.1063/1.1906287
10.1063/1.1906287
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