Quantum dots exhibit strongly size-dependent optical and electrical qualities. The opportunity to join the dots into complex assemblies creates many possibilities for scientific discovery. This motivated our present searching on QDIPs, DWELLs, and graphene like QDs. The aim of these studies ended up being to read the size dependent achievements of QDIPs, DWELLs, and graphene like QDs with individuals of competitive technologies, using the focus on the fabric qualities, device structure, as well as their effect on the unit performance.

Within this dissertation four scientific studies relating to optical qualities of quantum us dot and us dot-in-a-well infrared photodetectors, I-V characteristics of graphene quantum dots, and and spin texture of germanene quantum dots are presented. Improving self-put together QD is really a key trouble in the growing the absorption and increasing the performance. In our searching, a perfect self-put together QD structure is examined theoretically with twenty-hole levels (Intraband optical transitions inside the valence band) and twenty-electron levels of energy (DWELL). Ongoing the efforts to review self-put together QDs we extended our try to graphene like quantum dots (graphene and germanene) to review the electronic transport qualities.

We study numerically the intraband optical transitions inside the valence gang of Inx Ga1-x As/GaAs pyramidal quantum dots. We evaluate the potential of tuning of corresponding absorption spectra by different the dimensions and composition from the dots. Both ‘x ’ and how big the quantum us dot base are varied. Recommendations the absorption spectra of these quantum dots tend to be more responsive to the in-plane incident light.

We present numerically acquired absorption optical spectra of n-doped InAs/In0.15 Ga0.85 As/GaAs quantum us dot-in-a-well systems. The absorption spectra mostly are based on how big the quantum us dot and also have weak reliance on the thickness from the quantum well and position from the us dot inside a well. The us dot-in-a-well product is responsive to in-plane and out-of-plane polarizations from the incident light with much more powerful absorption intensities for that in-plane-polarized light.

We present theoretically acquired I-V characteristics of graphene quantum dots, that are recognized like a small bit of monolayer graphene. We describe graphene inside the nearest-neighbor tight-binding model. The present in comparison to the bias current has typical step-like shape, which is a result of discrete energy spectrum from the quantum us dot. The present with the us dot system also depends upon the positioning of the electrodes in accordance with the quantum us dot.

With regards to graphene quantum dots, we present our study of buckled graphene-like materials, like germanene and silicene. We consider theoretically germanene quantum us dot, composed of 13, 27, and 35 germanium atoms. Because of strong spin-orbit interaction and buckled structure from the germanene layer, the direction from the spin of the electron within the quantum us dot depends upon both electron energy and exterior verticle with respect electric field. With variation of one’s, the direction of spin changes by roughly 4.5 . Use of exterior electric field leads to rotation of electron spin by roughly .

in which the direction of rotation depends upon the electron energy.

Chaganti, Venkata, “Optical and Transport Qualities of Quantum Dots in Us dot-In-A-Well Systems and Graphene-Like Materials.” Dissertation, Georgia Condition College, 2015.
scholarworks.gsu.edu/phy_astr_diss/82

Quantum dots exhibit strongly size-dependent optical and electrical qualities. The opportunity to join the dots into complex assemblies creates many possibilities for scientific discovery. This motivated our present searching on QDIPs, DWELLs, and graphene like QDs. The aim of these studies ended up being to read the size dependent achievements of QDIPs, DWELLs, and graphene like QDs with individuals of competitive technologies, using the focus on the fabric qualities, device structure, as well as their effect on the unit performance.

Within this dissertation four scientific studies relating to optical qualities of quantum us dot and us dot-in-a-well infrared photodetectors, I-V characteristics of graphene quantum dots, and and spin texture of germanene quantum dots are presented. Improving self-put together QD is really a key trouble in the growing the absorption and increasing the performance. In our searching, a perfect self-put together QD structure is examined theoretically with twenty-hole levels (Intraband optical transitions inside the valence band) and twenty-electron levels of energy (DWELL). Ongoing the efforts to review self-put together QDs we extended our try to graphene like quantum dots (graphene and germanene) to review the electronic transport qualities.

We study numerically the intraband optical transitions inside the valence gang of Inx Ga1-x As/GaAs pyramidal quantum dots. We evaluate the potential of tuning of corresponding absorption spectra by different the dimensions and composition from the dots. Both ‘x ’ and how big the quantum us dot base are varied. Recommendations the absorption spectra of these quantum dots tend to be more responsive to the in-plane incident light.

We present numerically acquired absorption optical spectra of n-doped InAs/In0.15 Ga0.85 As/GaAs quantum us dot-in-a-well systems. The absorption spectra mostly are based on how big the quantum us dot and also have weak reliance on the thickness from the quantum well and position from the us dot inside a well. The us dot-in-a-well product is responsive to in-plane and out-of-plane polarizations from the incident light with much more powerful absorption intensities for that in-plane-polarized light.

We present theoretically acquired I-V characteristics of graphene quantum dots, that are recognized like a small bit of monolayer graphene. We describe graphene inside the nearest-neighbor tight-binding model. The present in comparison to the bias current has typical step-like shape, which is a result of discrete energy spectrum from the quantum us dot. The present with the us dot system also depends upon the positioning of the electrodes in accordance with the quantum us dot.

With regards to graphene quantum dots, we present our study of buckled graphene-like materials, like germanene and silicene. We consider theoretically germanene quantum us dot, composed of 13, 27, and 35 germanium atoms. Because of strong spin-orbit interaction and buckled structure from the germanene layer, the direction from the spin of the electron within the quantum us dot depends upon both electron energy and exterior verticle with respect electric field. With variation of one’s, the direction of spin changes by roughly 4. Use of exterior electric field leads to rotation of electron spin by roughly . in which the direction of rotation depends upon the electron energy.

Chaganti, Venkata, “Optical and Transport Qualities of Quantum Dots in Us dot-In-A-Well Systems and Graphene-Like Materials.” Dissertation, Georgia Condition College, 2015.
scholarworks.gsu.edu/phy_astr_diss/82