Direct visualization of sign-reversal<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msup><mml:mi>s</mml:mi><mml:mo>±</mml:mo></mml:msup></mml:math>superconducting gaps in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>FeTe</mml:mi><mml:mrow><mml:mn>0.55</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi>Se</mml:mi><mml:mrow><mml:mn>0.45</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Chen, Mingyang; Tang, Qingkun; Chen, Xiao-yu; Gu, Qiangqiang; Yang, Huan; Du, Zuliang; Zhu, Xiyu; Wang, Enyu; Wang, Qiang-Hua; Wen, Hao

doi:10.1103/physrevb.99.014507

Cited by 20 publications

(17 citation statements)

References 32 publications

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“…We perform finite-temperature calculations for the quantum triangular system. In a recent study, it has been predicted that the specific heat at θ = 0 (Heisenberg limit) has two anomalies at T ∼ 0.2 and T ∼ 0.55 26 . In our calculated C(T ) at θ = 0, a clear peak is obtained at T ∼ 0.2, and a shoulder-like anomaly is obtained at T ∼ 0.6, shown in Fig.…”

Section: Triangular Latticementioning

confidence: 99%

“…In the TL, the ground state exhibits 120 • order [21][22][23] , whereas in the KL it is predicted to be the quantum spin liquids [31][32][33][34][35][36][37][38][39][40][41] or valence bond crystals [42][43][44][45] . At finite temperature, these models shows commonly multiple-peak structures in the temperature dependence of specific heat owing to the frustration effect 26,[46][47][48][49]51,53 .…”

Section: Introductionmentioning

confidence: 99%

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Finite-temperature properties of the Kitaev-Heisenberg models on kagome and triangular lattices studied by improved finite-temperature Lanczos methods

Morita

Tohyama

2020

Phys. Rev. Research

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Frustrated quantum spin systems such as the Heisenberg and Kitaev models on various lattices, have been known to exhibit various exotic properties not only at zero temperature but also for finite temperatures. Inspired by the remarkable development of the quantum frustrated spin systems in recent years, we investigate the finite-temperature properties of the S = 1/2 Kitaev-Heisenberg models on kagome and triangular lattices by means of finite-temperature Lanczos methods with improved accuracy. In both lattices, multiple peaks are confirmed in the specific heat. To find the origin of the multiple peaks, we calculate the static spin structure factor. The origin of the high-temperature peak of the specific heat is attributed to a crossover from the paramagnetic state to a short-range ordered state whose static spin structure factor has zigzag-or linear-intensity distributions in the momentum space. In the triangular Kitaev model, the "order-by-disorder" due to quantum fluctuation occurs. On the other hand, in the kagome Kitaev model it does not occur even with both quantum and thermal fluctuations. arXiv:1911.09266v1 [cond-mat.str-el]

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Section: Triangular Latticementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Finite-temperature properties of the Kitaev-Heisenberg models on kagome and triangular lattices studied by improved finite-temperature Lanczos methods

Morita

Tohyama

2020

Phys. Rev. Research

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“…Raman scattering in cold atomic ensembles [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30], or storing one of correlated or entangled photons in a solid-state [31][32][33][34] or gas-state atomic ensemble [35]. Additionally, entanglement between a single photon and a single quantum-system such as a NV-center [36], or a trapped atom/ion [37][38][39][40][41], has been experimentally demonstrated and proposed for alternative QR approaches [42][43][44][45].…”

Section: Such Lmqis Have Been Experimentally Demonstrated By Using Spmentioning

confidence: 99%

“…Additionally, entanglement between a single photon and a single quantum-system such as a NV-center [36], or a trapped atom/ion [37][38][39][40][41], has been experimentally demonstrated and proposed for alternative QR approaches [42][43][44][45]. The atomic-ensemble based LMQIs [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35] are attractive because they use relatively simple ingredients [1,14]. However, the probability to prepare the atom-photon entanglement in such LMQIs has to be kept low for avoiding multi-excitation errors.…”

Section: Such Lmqis Have Been Experimentally Demonstrated By Using Spmentioning

confidence: 99%

Spatial Multiplexing of Atom-Photon Entanglement Sources using Feedforward Control and Switching Networks

Liang¹,

Xu²,

Chen³

et al. 2017

Phys. Rev. Lett.

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The light-matter quantum interface that can create quantum correlations or entanglement between a photon and one atomic collective excitation is a fundamental building block for a quantum repeater. The intrinsic limit is that the probability of preparing such nonclassical atom-photon correlations has to be kept low in order to suppress multiexcitation. To enhance this probability without introducing multiexcitation errors, a promising scheme is to apply multimode memories to the interface. Significant progress has been made in temporal, spectral, and spatial multiplexing memories, but the enhanced probability for generating the entangled atom-photon pair has not been experimentally realized. Here, by using six spin-wave-photon entanglement sources, a switching network, and feedforward control, we build a multiplexed light-matter interface and then demonstrate a ∼sixfold (∼fourfold) probability increase in generating entangled atom-photon (photon-photon) pairs. The measured compositive Bell parameter for the multiplexed interface is 2.49±0.03 combined with a memory lifetime of up to ∼51 μs.

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“…An advantage of the protocols that use entanglement sources [7], compared to those that use quantum correlation sources [2,5], is that long-distance phase stability is no longer required [3]. Over the past ~ 20 years, sources have been demonstrated by using 3 spontaneous Raman scattering in cold atomic ensembles [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] or storing one member of an entangled photon pair in a solid-state [29][30][31] or gas-state atomic ensemble [32]. Unfortunately, the quantum memories in these sources are single-mode.…”

Section: Introductionmentioning

confidence: 99%

Multiplexed spin-wave–photon entanglement source using temporal multimode memories and feedforward-controlled readout

Yan

Zhou

et al. 2019

Phys. Rev. A

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A source that can generate atom-photon quantum correlations or entanglement based on a quantum memory is a basic building block of quantum repeaters (QRs). To achieve high entanglement generation rates in ensemble-based QRs, spatial-, temporal-and spectral-multimode memories are needed. Previous temporal-multimode memories are based on rephasing mechanisms in inhomogeneously broadened media. Here, by applying a train of write pulses in time, with each pulse coming from a different direction, to a homogeneously broadened atomic ensemble to induce Duan-Lukin-Cirac-Zoller-like Raman processes, we prepare up to 19 pairs of modes, namely, one spin-wave mode and one photonic time bin. Spin-wave-photon (i.e., atom-photon) entanglement is probabilistically produced in these mode pairs. Based on the stored spin-wave modes together with feed-forward-controlled readout, we build a temporally multiplexed source and then demonstrate an 18.8-fold increase in the probability of the generation of spin-wave-photon entanglement compared to the sources that use individual modes.The measured Bell parameter for the multiplexed source is 2.30 0.02  , and the memory lifetime is 30 μs.

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Direct visualization of sign-reversals±superconducting gaps inFeTe0.55Se0.45

Cited by 20 publications

References 32 publications

Finite-temperature properties of the Kitaev-Heisenberg models on kagome and triangular lattices studied by improved finite-temperature Lanczos methods

Finite-temperature properties of the Kitaev-Heisenberg models on kagome and triangular lattices studied by improved finite-temperature Lanczos methods

Spatial Multiplexing of Atom-Photon Entanglement Sources using Feedforward Control and Switching Networks

Multiplexed spin-wave–photon entanglement source using temporal multimode memories and feedforward-controlled readout

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