Resistively detected nuclear magnetic resonance via a single InSb two-dimensional electron gas at high temperature

Yang, K. F.; Liu, Hongwu; Nagase, Kenzo; Mıshıma, Tetsuya D.; Santos, M. B.; Hirayama, Y.

doi:10.1063/1.3579257

Cited by 11 publications

(15 citation statements)

References 32 publications

(30 reference statements)

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“…More recently, we have performed the RDNMR measurement of the QHF formed at ν=2 of the InSb 2DEG [25,26]. Because the ν=2 QHF including only the two lowest LLs can be described by a single-particle picture, it is more appropriate for investigating the DW dynamics of the QHF.…”

Section: Introductionmentioning

confidence: 99%

Pump-probe nuclear spin relaxation study of the quantum Hall ferromagnet at filling factor ν = 2

et al. 2019

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The nuclear spin-lattice relaxation time T 1 of the ν=2 quantum Hall ferromagnet (QHF) formed in a gate-controlled InSb two-dimensional electron gas has been characterized using a pump-probe technique. In contrast to a long T 1 of quantum Hall states around ν=1 that possesses a Korringatype temperature dependence, the temperature-independent short T 1 of the ν=2 QHF suggests the presence of low energy collective spin excitations in a domain wall. Furthermore, T 1 of this ferromagnetic state is also found to be fillingand current-independent. The interpretation of these results as compared to the T 1 properties of other QHFs is discussed in terms of the domain wall skyrmion, which will lead to a better understanding of the QHF.

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Section: Introductionmentioning

confidence: 99%

Pump-probe nuclear spin relaxation study of the quantum Hall ferromagnet at filling factor ν = 2

et al. 2019

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“…We first present the results obtained from the Corbino disk. Figure 1 shows that the DC RDNMR signal of 115 In has a dispersive line shape (DLS) with quadrupole splittings at low temperatures ( T ) and disappears at 2 K. Note that the signals at T ≤1 K are nearly independent of temperature due to the current-induced heating30. Figure 1b depicts the domain structures of QHF, where the spin-polarized (spin polarization P =1) and spin-unpolarized ( P =0) domains are separated by DW (order of the magnetic length l B in width31).…”

Section: Resultsmentioning

confidence: 99%

Role of chiral quantum Hall edge states in nuclear spin polarization

et al. 2017

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Resistively detected NMR (RDNMR) based on dynamic nuclear polarization (DNP) in a quantum Hall ferromagnet (QHF) is a highly sensitive method for the discovery of fascinating quantum Hall phases; however, the mechanism of this DNP and, in particular, the role of quantum Hall edge states in it are unclear. Here we demonstrate the important but previously unrecognized effect of chiral edge modes on the nuclear spin polarization. A side-by-side comparison of the RDNMR signals from Hall bar and Corbino disk configurations allows us to distinguish the contributions of bulk and edge states to DNP in QHF. The unidirectional current flow along chiral edge states makes the polarization robust to thermal fluctuations at high temperatures and makes it possible to observe a reciprocity principle of the RDNMR response. These findings help us better understand complex NMR responses in QHF, which has important implications for the development of RDNMR techniques.

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“…For the simplest QHF at filling factor ν = 2, recently realized in InSb quantum wells192021, the comparable cyclotron and Zeeman energies result in the degeneracy of spin up electron states of the lowest n = 0 Landau level (blue) and spin down electron states of the second n = 1 Landau level (red) as illustrated in Fig. 1(b).…”

Section: Modelmentioning

confidence: 89%

“…A major progress has been achieved recently by experimentally demonstrating electrical detection and manipulation of nuclear spins with spins of electrons in quantum Hall systems101112131415161718192021222324. However, the microscopic mechanism behind the nuclear spin manipulation with electron spin is not well understood and we fill this gap here.…”

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confidence: 97%

Manipulation of a Nuclear Spin by a Magnetic Domain Wall in a Quantum Hall Ferromagnet

Korkusiński

Hawrylak

Liu

et al. 2017

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The manipulation of a nuclear spin by an electron spin requires the energy to flip the electron spin to be vanishingly small. This can be realized in a many electron system with degenerate ground states of opposite spin polarization in different Landau levels. We present here a microscopic theory of a domain wall between spin unpolarized and spin polarized quantum Hall ferromagnet states at filling factor two with the Zeeman energy comparable to the cyclotron energy. We determine the energies and many-body wave functions of the electronic quantum Hall droplet with up to N = 80 electrons as a function of the total spin, angular momentum, cyclotron and Zeeman energies from the spin singlet ν = 2 phase, through an intermediate polarization state exhibiting a domain wall to the fully spin-polarized phase involving the lowest and the second Landau levels. We demonstrate that the energy needed to flip one electron spin in a domain wall becomes comparable to the energy needed to flip the nuclear spin. The orthogonality of orbital electronic states is overcome by the many-electron character of the domain - the movement of the domain wall relative to the position of the nuclear spin enables the manipulation of the nuclear spin by electrical means.

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Resistively detected nuclear magnetic resonance via a single InSb two-dimensional electron gas at high temperature

Cited by 11 publications

References 32 publications

Pump-probe nuclear spin relaxation study of the quantum Hall ferromagnet at filling factor ν = 2

Pump-probe nuclear spin relaxation study of the quantum Hall ferromagnet at filling factor ν = 2

Role of chiral quantum Hall edge states in nuclear spin polarization

Manipulation of a Nuclear Spin by a Magnetic Domain Wall in a Quantum Hall Ferromagnet

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