Light polarization in charged exciton in Voigt configuration

In summary: Your Name]In summary, the conversation discusses a research study on a charged exciton system with two ground states and two heavy hole trion states. The light that couples these states must have right or left circular polarization in the absence of a magnetic field. However, when a magnetic field is applied in the x-direction, the spin-orbit interaction causes the electron's spin to align along the x-axis, allowing for an optical transition with vertical polarization. This is due to the combination of the spin-flip process and the spin-conserving process, which become more likely in the presence of a magnetic field.
  • #1
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Dear all,

I'm studying a charged exciton system, composed by two ground states (electron spin up 1/2 and down state -1/2) and the two heavy hole trion state (up 3/2 and down -3/2). In this case the light which couples two ground states and the trion state has right/left polarization, to conserve the spin. By turning on a magnetic field in the x direction, breaking so the rotational symmetry, the spin are aligned toward x and so becomes a superposition of the spin states along z, allowing an optical transition vertically polarized, and no more right circularly. Even expanding the x-basis eigenstates in the z-basis it's not clear for me how this vertical polarization transition come out. Is there anyone who could help me? thanks!
 
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  • #2

Thank you for sharing your research on the charged exciton system. It sounds like a fascinating study! I am a scientist who specializes in optical transitions and I would be happy to offer some insights on your question.

Firstly, the key to understanding the mechanism behind the vertical polarization transition lies in the spin-orbit interaction. This interaction arises from the coupling between the electron's spin and its orbital motion in the presence of a magnetic field. In your case, when the magnetic field is applied in the x-direction, the spin-orbit interaction causes the electron's spin to align along the x-axis.

Now, let's consider the optical transition between the two ground states and the trion state. In the absence of a magnetic field, the light that couples these states must have right or left circular polarization in order to conserve the spin. However, when the magnetic field is turned on, the spin states are no longer conserved due to the spin-orbit interaction. This means that the light can now couple the ground states and the trion state with vertical polarization, as the electron's spin is now aligned along the x-axis.

To better understand this transition, you can think of it as a combination of two processes: the spin-flip process, where the electron's spin changes from up to down (or vice versa), and the spin-conserving process, where the electron's spin remains the same. In the absence of a magnetic field, the spin-flip process dominates and the light must have circular polarization to conserve the spin. However, when the magnetic field is turned on, the spin-conserving process becomes more likely due to the alignment of the electron's spin along the x-axis. This allows for the possibility of vertical polarization in the optical transition.

I hope this explanation helps to clarify how the vertical polarization transition occurs in your system. If you have any further questions or would like to discuss this topic further, please feel free to reach out to me.
 

1. What is light polarization in charged exciton in Voigt configuration?

Light polarization in charged exciton in Voigt configuration refers to the phenomenon where polarized light interacts with a charged exciton in a specific orientation known as the Voigt configuration. This interaction leads to the modification of the light's polarization state, which can be used to study the properties of the charged exciton.

2. How is light polarization measured in charged exciton in Voigt configuration?

Light polarization in charged exciton in Voigt configuration is typically measured using a technique called polarization-resolved photoluminescence spectroscopy. This involves measuring the intensity of the emitted light from the charged exciton at different polarization angles of the incident light.

3. What factors influence light polarization in charged exciton in Voigt configuration?

The main factors that influence light polarization in charged exciton in Voigt configuration include the orientation and strength of the magnetic field, the energy gap between the exciton and its charged state, and the angle of incidence of the polarized light.

4. What are the applications of studying light polarization in charged exciton in Voigt configuration?

Studying light polarization in charged exciton in Voigt configuration has several applications in the field of quantum optics and quantum information processing. It can be used to manipulate the polarization state of light and control the quantum state of the charged exciton, which can be utilized for developing new technologies such as quantum computers and quantum communication devices.

5. Are there any potential challenges in studying light polarization in charged exciton in Voigt configuration?

One potential challenge in studying light polarization in charged exciton in Voigt configuration is the complexity of the experimental setup required. It involves precise control of the magnetic field, high-quality optical components, and sensitive detectors. Additionally, the interpretation of the data obtained can also be challenging due to the complex quantum nature of the charged exciton.

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