Spectroscopic evidence of quantum Hall interlayer tunneling gap collapse caused by tilted magnetic field in a GaAs/AlGaAs triple quantum well

Santos, Luciano Costa; Barbosa, B. G.; Gusev, G. M.; Ludwig, Jonathan; Smirnov, Dmitry; Bakarov, A. K.; Pusep, Yuri A.

doi:10.1103/physrevb.89.195113

Cited by 10 publications

(6 citation statements)

References 43 publications

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“…29,34 For TQWs, it was predicted that the SOI can be smoothly tuned by the electron occupation, controlled by a gate voltage, and with a contribution arising from the linear Dresselhaus term being stronger than in DQWs. 35 Such structures have been extensively studied by magnetotransport [36][37][38] and also suggested for applications in the production of spin blockers and filters. 39,40 We calculated the inter-and intra-subband spin-orbit coefficients for our sample structure and found a large current-controlled spin-orbit field.…”

Section: Introductionmentioning

confidence: 99%

Macroscopic transverse drift of long current-induced spin coherence in two-dimensional electron gases

et al. 2016

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We imaged the transport of current-induced spin coherence in a two-dimensional electron gas confined in a triple quantum well. Nonlocal Kerr rotation measurements, based on the optical resonant amplification of the electrically-induced polarization, revealed a large spatial variation of the electron g factor and the efficient generation of a current-controlled spin-orbit field in a macroscopic Hall bar device. We observed coherence times in the nanoseconds range transported beyond half-millimeter distances in a direction transverse to the applied electric field. The measured long spin transport length can be explained by two material properties: large mean free path for charge diffusion in clean systems and enhanced spin-orbit coefficients in the triple well. arXiv:1605.06854v3 [cond-mat.mes-hall]

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Section: Introductionmentioning

confidence: 99%

Macroscopic transverse drift of long current-induced spin coherence in two-dimensional electron gases

et al. 2016

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“…Multilayer coupled 2DEG's like trilayer systems offer much more possibilities for the theoretical [3][4][5] and experimental [6][7][8][9][10][11][12] search of the involved physics, even at zero magnetic field. New single-particle effects like layer (site) energies, tunneling coupling between layers, and many-body effects as the inter-layer Coulomb coupling should be included, with the two later effects being strongly dependent on the separation between layers.…”

Section: Introductionmentioning

confidence: 99%

Coulomb and tunneling-coupled trilayer systems at zero magnetic field

2016

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The ground-state electronic configuration of three coupled bidimensional electron gases has been determined using a variational Hartree-Fock approach, at zero magnetic field. The layers are Coulomb coupled, and tunneling is present between neighboring layers. In the limit of small separation between layers, the tunneling becomes the dominant energy contribution, while for large distance between layers the physics is driven by the Hartree electrostatic energy. Transition from tunneling to hartree dominated physics is shifted towards larger layer separation values as the total bidimensional density of the trilayers decreases. The inter-layer exchange stabilizes a "balanced" configuration, where the three layers are approximately equally occupied; most of the experiments are performed in the vicinity of this balanced configuration. Several ground-state configurations are consequence of a delicate interplay between tunneling and inter-subband exchange.

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“…On the experimental side, earlier publications report the finding of IQH and FQH signals in trilayers [31], and the evidence of a trilayer → bilayer transition induced by increasing the perpendicular component of the magnetic field [32][33][34]. More recent experimental work in trilayers concentrates on the multisubband fingerprints in the magnetoresistance oscillations as measured in Shubnikov-de Haas experiments at ν = 2 and 4 [35], on the effect of a tilted magnetic field on the IQH plateaus [36], and report spectroscopic evidence on the collapse of the interlayer tunneling gap for particular values of the tilted component of the magnetic field [37]. The unique features of the IQH effect in trilayer graphene has been also studied [38].…”

Section: Introductionmentioning

confidence: 99%

Pseudospin anisotropy of trilayer semiconductor quantum Hall ferromagnets

Miravet

Proetto

2016

Phys. Rev. B

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When two Landau levels are brought to a close coincidence between them and with the chemical potential in the Integer Quantum Hall regime, the two Landau levels can just cross or collapse while the external or pseudospin field that induces the alignment changes. In this work, all possible crossings are analyzed theoretically for the particular case of semiconductor trilayer systems, using a variational Hartree-Fock approximation. The model includes tunneling between neighboring layers, bias, intra-layer and inter-layer Coulomb interaction among the electrons. We have found that the general pseudospin anisotropy classification scheme used in bilayers applies also to the trilayer situation, with the simple crossing corresponding to an easy-axis ferromagnetic anisotropy analogy, and the collapse case corresponding to an easy-plane ferromagnetic analogy. An isotropic case is also possible, with the levels just crossing or collapsing depending on the filling factor and the quantum numbers of the two nearby levels. While our results are valid for any integer filling factor ν (=1,2,3,...), we have analyzed in detail the crossings at ν = 3 and 4, and we have given clear predictions that will help in their experimental search. In particular, the present calculations suggest that by increasing the bias, the trilayer system at these two filling factors can be driven from an easy-plane anisotropy regime to an easy-axis regime, and then can be driven back to the easy-plane regime. This kind of reentrant behavior is an unique feature of the trilayers, compared with the bilayers. arXiv:1607.07909v1 [cond-mat.mes-hall]

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Spectroscopic evidence of quantum Hall interlayer tunneling gap collapse caused by tilted magnetic field in a GaAs/AlGaAs triple quantum well

Cited by 10 publications

References 43 publications

Macroscopic transverse drift of long current-induced spin coherence in two-dimensional electron gases

Macroscopic transverse drift of long current-induced spin coherence in two-dimensional electron gases

Coulomb and tunneling-coupled trilayer systems at zero magnetic field

Pseudospin anisotropy of trilayer semiconductor quantum Hall ferromagnets

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