Spin splitting of conduction subbands in III-V heterostructures due to inversion asymmetry

Pfeffer, P.; Zawadzki, W.

doi:10.1103/physrevb.59.r5312

Cited by 182 publications

(154 citation statements)

References 23 publications

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“…37. We also mention a possible additional source of spin splitting in quantum wells, the so-called native interface asymmetry, related to chemical bonds across interfaces (for more details see Refs.…”

Section: Electronic Ground Statementioning

confidence: 99%

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Intersubband spin-density excitations in quantum wells with Rashba spin splitting

Ullrich

Flatté

2002

Phys. Rev. B

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In inversion-asymmetric semiconductors, spin-orbit coupling induces a k-dependent spin splitting of valence and conduction bands, which is a well-known cause for spin decoherence in bulk and heterostructures. Manipulating nonequilibrium spin coherence in device applications thus requires understanding how valence and conduction band spin splitting affects carrier spin dynamics. This paper studies the relevance of this decoherence mechanism for collective intersubband spin-density excitations (SDEs) in quantum wells. A density-functional formalism for the linear spin-density matrix response is presented that describes SDEs in the conduction band of quantum wells with subbands that may be non-parabolic and spin-split due to bulk or structural inversion asymmetry (Rashba effect). As an example, we consider a 40 nm GaAs/Al0.3Ga0.7As quantum well, including Rashba spin splitting of the conduction subbands. We find a coupling and wavevector-dependent splitting of the longitudinal and transverse SDEs. However, decoherence of the SDEs is not determined by subband spin splitting, due to collective effects arising from dynamical exchange and correlation.

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Section: Electronic Ground Statementioning

confidence: 99%

“…30 If one is only interested in the electronic structure of the conduction band of a quantum well, it is convenient to reduce the multi-band Hamiltonian described above to a 2 × 2 conduction band Hamiltonian. 33,34,35,36,37 The single-particle states (1) can then be simplified to the following two-component form:…”

Section: Electronic Ground Statementioning

confidence: 99%

Intersubband spin-density excitations in quantum wells with Rashba spin splitting

Ullrich

Flatté

2002

Phys. Rev. B

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“…Spin-orbit effects on single dots have been already extensively investigated. [27][28][29][30][31][32][33][34][35][36][37][38] In this paper we investigate the role of spin-orbit coupling, represented by the Dresselhaus ͑both linear and cubic͒ and Bychkov-Rashba terms, in spin and charge properties of two laterally coupled quantum dots based on GaAs materials parameters. We perform numerically exact calculations of the energy spectrum using the method of finite differences.…”

Section: Introductionmentioning

confidence: 99%

Spin-orbit effects in single-electron states in coupled quantum dots

2005

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Spin-orbit effects in single-electron states in laterally coupled quantum dots in the presence of a perpendicular magnetic field are studied by exact numerical diagonalization. Dresselhaus ͑linear and cubic͒ and Bychkov-Rashba spin-orbit couplings are included in a realistic model of confined dots based on GaAs. Group theoretical classification of quantum states with and without spin-orbit coupling is provided. Spin-orbit effects on the g factor are rather weak. It is shown that the frequency of coherent oscillations ͑tunneling amplitude͒ in coupled dots is largely unaffected by spin-orbit effects due to symmetry requirements. The leading contributions to the frequency involves the cubic term of the Dresselhaus coupling. Spin-orbit coupling in the presence of a magnetic field leads to a spin-dependent tunneling amplitude, and thus to the possibility of spin to charge conversion, namely, spatial separation of spin by coherent oscillations in a uniform magnetic field. It is also shown that spin hot spots exist in coupled GaAs dots already at moderate magnetic fields, and that spin hot spots at zero magnetic field are due to the cubic Dresselhaus term only.

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“…As expected, both paraboloids shift in opposite p x directions resulting in a sublevel anticrossing. This displacement is due not only to the magnetic field but also to the electric one (12).…”

Section: Resultsmentioning

confidence: 99%

“…Several peculiarities for transport phenomena in heterostructures have been also discussed [12][13][14][15]. However, these discussions only consider the mix-ing between Pauli contribution and effective 2D spin-orbit interaction.…”

Section: Introductionmentioning

confidence: 99%

Abrupt barrier contribution to electron spin splitting in asymmetric coupled double quantum wells

Hernández‐Cabrera

Aceituno

2014

Indian J Phys

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We have studied the behavior of the electronic energy spin-splitting of InGaAs − InAlAs based double quantum wells (narrow gap structures) under in-plane magnetic and transverse electric fields. We have developed an improved 8 × 8 version of the Transfer Matrix Approach that consider contributions from abrupt interfaces and external fields when tunneling through central barrier exists. We have included the Landé g-factor dependence on the external applied field. Also, we have calculated electron density of states and photoluminescence excitation. Variations of the electron spin-splitting energy lead to marked peculiarities in the density of states.Because the density of states is directly related to photoluminescence excitation, these peculiarities are observable by this technique.

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Spin splitting of conduction subbands in III-V heterostructures due to inversion asymmetry

Cited by 182 publications

References 23 publications

Intersubband spin-density excitations in quantum wells with Rashba spin splitting

Intersubband spin-density excitations in quantum wells with Rashba spin splitting

Spin-orbit effects in single-electron states in coupled quantum dots

Abrupt barrier contribution to electron spin splitting in asymmetric coupled double quantum wells

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