Questions tagged [quantum-dots]
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What is the difference between nanomaterials and quantum materials? [closed]
As per my knowledge, they are different according to their dimensions only. Can you please explain if I am missing something?
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Electronic Band Structure in 0D, 1D and 2D materials
Quantum dots have discrete electronic band structures (see https://www.worldscientific.com/doi/pdf/10.1142/9789814397988_0004#:~:text=In%20the%20quantum%20dot%2C%20there,4.1) due to having very few ...
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Absorption and Emission Spectra of Quantum Dots
For one of my next labs, I will be measuring the absorbtion and emission spectra of a tolulene solution with quantum dots in it. The gist of the idea is that I will end up obtaining a graph similar to ...
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Quantum dots applications [closed]
I wanna find some interesting project for my master thesis concerning quantum dots, meanwhile I'm learning open quantum dynamics (Markovian & non-Markovain). Is there some ideas to combine these ...
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How to prove that a Hamiltonian is $SU(4)$ invariant?
I am studying the following hamiltonian, consisting of a double quantum dot system
\begin{align}
\hat{H}_{2QD} = \sum_{i=1,2}v_{i}\hat{n}_{i}+\sum_{i=1,2}U_{i}\hat{n}_{i\uparrow}\hat{n}_{i\downarrow} +...
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Dimensions of the space of quantum states in a quantum dot
In the paper
C. S. Lent and P. D. Tougaw, "A device architecture for computing with quantum dots," in Proceedings of the IEEE, vol. 85, no. 4, pp. 541-557, April 1997, doi: 10.1109/5.573
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Why do phosphorescent screens need electron energy in order of KeV to emit light, when visible light photons only need ~eV?
All phosphorescent screens operate at ~KeV energies, but emit photons with energies ~eV. Why is such a high input energy necessary?
What is the situation with quantum dots, do they also require hight ...
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Has anyone come across the relationship between Higher order confinement wave-functions and corresponding Zeeman Interaction?
I'm studying a hole quantum dot in Germanium. The problem is described in the Luttinger Spin-3/2 basis and takes Fock-Darwin states as solutions in the Quantum Dot plane(xy plane). Furthermore, I ...
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Are electrons in a semiconductor quantum dot is a real electron or just a quasiparticle with a well-defined spin?
It seems there is a consensus that in the gate-defined quantum dot exists isolated electron with well-defined spin. And I understand that by tuning the voltages applied to the 2DEG at quantum well, ...
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What dimensions would a quantum confinement system have to be for its electromagnetic emission spectrum to be in the radio section?
Just as specific dimensional restrictions on systems that have quantum confinement like quantum dots lead to the tenability of the emission spectrum of such a system, I was wondering how this idea ...
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In spin qubit of quantum dots, why $|S>$ and $|T0>$ state have energy difference?
As we know, the Zeeman splitting by magnetic field causes the energy difference between |↑> and |↓>, therefore states like |T+>=|↑↑> have a different energy from others. But why states ...
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What does a gate electrode do in the context of a quantum dot?
I am trying to understand the creation of qubits through the use of quantum dots, but I have always had some trouble understanding the function of the gate. I know it can control the chemical ...
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Golden quantum dots blinking and plasmons
I have been reading this article about golden QD as a way to avoid QD blinking. I understand that the surface plasmons here act as a nano antenna which strongly concentrates the light, but I don’t ...
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Bound states on a Quantum Dot and Tunneling on and off the Dot
Question is essentially: How can the states on a quantum dot be bound when we can tunnel onto them? If plane wave states can tunnel onto them, these plane waves states and the 'bound' states will have ...
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Any material that could help me calculate the surface/longitudinal/transversal modes in an isotropic semiconductor?
Basically a homework question, but I don't actually have a homework to give in. I just do it out of curiosity.
I would like to know if there are any good materials out there that could ilustrate to me ...
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Chemical potentials of source and drain
I'm trying to learn the concept of quantum dots and coulomb diamonds, and I'm trying to read this but I have encountered a problem which I couldn't find answer online. On the 4th page it mentioned:
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Interference of single photons emitted from solid state sources
Solid state emitters such as quantum dots are thought of as being amongst the best single photon sources for quantum technology.
There have been impressive demonstrations of >10 photon experiments ...
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Phonons in quantum dots
If my understanding is correct, quantum dots are tiny crystals where the confined electronic degrees of freedom have discrete energy levels. In this paper Phys. Rev. B 65, 195313 (2002), and many ...
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Dispersive regime and resonator frequency pull
I have come across terms such as "dispersive regime" and "dispersive measurement" often.
To understand this, I have been reading this, this, and this.
In the first paper, the gist I got is the ...
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Coupling strength $g$ in various contexts
I've come across the term coupling strength $g/2\pi$ in various contexts (transmon, quantum dots, optomechanics etc)
Also, I've come across coupling term $J$ (exchange coupling) a lot.
I think in ...
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Semiconductor Quantum Dots
Can someone recommend some good books on semiconductor quantum dots(InGaAs, GaAs etc..) from the perspective of a beginner student. I mostly want to learn about the optical states (the ...
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Dresselhaus linear and cubic terms
I've been trying to understand Dresselhaus effect, described here.
I've been looking up references to find when the cubic term becomes more dominant than the linear term and vice versa.
For example, ...
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What is the difference between Quantum Dots and nanoparticles?
As far as I understand, both quantum dots and nanoparticles are mainly characterised by the fact that all three dimensions are in the nanoscale. Quantum dots are always mentioned to be made from a ...
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