Quantum dots or single electron transistors, allow for individual control of single charge or spin. In addition, some semiconductor monolayers possess a sizeable direct bandgap of ≈1.5–2 eV in the optical range allowing electrostatic confinement and optical manipulation of carriers. Therefore, we try to adopt the method of this theoretical paper[1], and see if we can control single qubit or couple 2 qubits optically.
Q & A
What are K & K' points?
K & K' points
K-points are sampling points of Brillouin zone in reciprocal lattice
Choose monolayer TMDCs materials or 2D heterostructure?
There are four main carrier properties that optimal Opto-valleytronics should possess.
long carrier lifetime
long valley lifetime
high valley polarization
long valley coherence time
By adopting 2D heterostructure TMDCs materials, we can create these conditions for building promising quantum platform. (eg. Due to the type II band alignment and weak hybridization of van der Waals heterostructure, the electron–hole layer separation, the electron–hole exchange interaction is greatly reduced, resulting in a long cryogenic lifetime (ns to s)and valley lifetime (~ 10 ns) of the interlayer exciton[2])
Method
Principle
Experimental setup
Quantum simulator
We intend to use WSe2 2D heterostructure encapsulated in hexagonal boron nitride (h-BN) as the physical platform, and ...
Qubit initialisation
Qubit control
Qubit readout
Results
References
↑Spin-valley qubit in nanostructures of monolayer semiconductors: Optical control and hyperfine interaction[1]
↑Opto-valleytronics in the 2D van der Waals heterostructure[2]
