Addition spectrum of a lateral dot from Coulomb and spin-blockade spectroscopy

Ciorga, Mariusz; Sachrajda, A. S.; Hawrylak, Paweł; Gould, C.; Zawadzki, Piotr; Jullian, S.; Feng, Y.; Wasilewski, Z. R.

doi:10.1103/physrevb.61.r16315

Cited by 406 publications

(451 citation statements)

References 17 publications

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“…In Fig. 1 similar to those used for few-electron QDs [27]. We focus on the region around the (1,1)-(2,0) charge transfer line where the Pauli spin blockade is commonly observed in electron DQDs.…”

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confidence: 99%

Consequences of Spin-Orbit Coupling at the Single Hole Level: Spin-Flip Tunneling and the Anisotropic g Factor

et al. 2017

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confidence: 99%

Consequences of Spin-Orbit Coupling at the Single Hole Level: Spin-Flip Tunneling and the Anisotropic g Factor

et al. 2017

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“…While it is possible to detect the spin orientation on very few electron dots just by identifying energy levels, conclusions about the spin configuration in many electron dots must be drawn indirectly from additional spin dependent effects. A few years ago it was demonstrated that so called spin blockade can be used to read the spin of the tunneling electron in lateral quantum dots in a perpendicular magnetic field [3]. More information about the spin configuration can be obtained when a Kondo effect [4] is observed depending on the spin configuration in Coulomb blocked regions [5,6].…”

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confidence: 99%

Multiple Transitions of the Spin Configuration in Quantum Dots

2006

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Single electron tunneling is studied in a many electron quantum dot in high magnetic fields. For such a system multiple transitions of the spin configuration are theoretically predicted. With a combination of spin blockade and Kondo effect we are able to detect five regions with different spin configurations. Transitions are induced with changing electron numbers. DOI: 10.1103/PhysRevLett.97.176801 PACS numbers: 73.63.Kv, 72.15.Qm, 73.21.La, 73.23.Hk Spin physics in semiconductor quantum dots [1] has pushed the research on nanostructures since quantum dots were suggested as essential elements in quantum computing devices [2]. The spin of a single electron on a quantum dot can act as a qubit and thus great efforts were made to prepare, manipulate, and read the spin on few electron quantum dots. But, in addition, the research on many electron dots has come up with exciting results and new effects dealing with spin. While it is possible to detect the spin orientation on very few electron dots just by identifying energy levels, conclusions about the spin configuration in many electron dots must be drawn indirectly from additional spin dependent effects. A few years ago it was demonstrated that so called spin blockade can be used to read the spin of the tunneling electron in lateral quantum dots in a perpendicular magnetic field [3]. More information about the spin configuration can be obtained when a Kondo effect [4] is observed depending on the spin configuration in Coulomb blocked regions [5,6].In a perpendicular magnetic field with two Landau levels in the quantum dot (filling factor 4 > dot > 2), a shell structure is assumed for the dot with Landau level 0 in the edge and level 1 in the core (see Fig. 1) [7]. An unpolarized spin configuration is expected at the edge of the dot for low electron numbers in high magnetic fields [8]. That means the total spin at the edge of the dot is 0 whenever the electron number is even, and 1 2 when the electron number is odd: S even ; S odd 0; 1 2 with S even and S odd the total spin at the edge of the dot for even and odd electron numbers (see Fig. 1). A few years ago multiple transitions of the spin configuration were theoretically predicted and calculated at the dot 2 boundary [9]. The spin polarization should increase with increasing electron number, 0; 1 2 ! 1; 1 2 ! 1; 3 2 . . . . These transitions of the spin configuration are related to spin flips in the dot < 2 regime when the spin configuration approaches the maximum density droplet. The first two spin configurations (0, 2 ) can be identified with the combination of spin blockade and Kondo effect [10]. While the first transition between these two configurations was observed in a few electron quantum dot [11], experimental evidence for multiple transitions was never found.We close this gap and present measurements of multiple transitions in the magnetoconductance of a many electron quantum dot. We make use of the combination of both spin blockade and Kondo effect at 4 > dot > 2 to identify five regions with differe...

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“…All measurements are performed at zero magnetic field. We tune the dot to the few-electron regime, 10,11 and completely pinch off the tunnel barrier between gates L and T, so that the dot is only coupled to the reservoir on the right. 12 The conductance of the QPC is tuned to about e 2 / h, making it very sensitive to the number of electrons on the dot.…”

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confidence: 99%

Nondestructive measurement of electron spins in a quantum dot

et al. 2006

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We propose and implement a nondestructive measurement that distinguishes between two-electron spin states in a quantum dot. In contrast to earlier experiments with quantum dots, the spins are left behind in the state corresponding to the measurement outcome. By measuring the spin states twice within a time shorter than the relaxation time T 1 , correlations between the outcomes of consecutive measurements are observed. They disappear as the wait time between measurements becomes comparable to T 1 . The correlation between the postmeasurement state and the measurement outcome is measured to be ϳ90% on average.

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Addition spectrum of a lateral dot from Coulomb and spin-blockade spectroscopy

Cited by 406 publications

References 17 publications

Consequences of Spin-Orbit Coupling at the Single Hole Level: Spin-Flip Tunneling and the Anisotropic g Factor

Consequences of Spin-Orbit Coupling at the Single Hole Level: Spin-Flip Tunneling and the Anisotropic g Factor

Multiple Transitions of the Spin Configuration in Quantum Dots

Nondestructive measurement of electron spins in a quantum dot

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