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Evidence for Spin-Triplet Electron Pairing in the Proximity-Induced Superconducting State of an Fe-Doped InAs Semiconductor
Taketomo Nakamura et al.
Phys. Rev. Lett. 122, 107001 (2019)
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.122.107001
拓扑磁振子诱导的手性声子输运
The plethora of recent discoveries in the field of topological electronic insulators has inspired a search for boson systems with similar properties. There are predictions that ferromagnets on a two-dimensional honeycomb lattice may host chiral edge magnons. In such systems, we theoretically study how magnons and phonons couple. We find topological magnon polarons around the avoided crossings between phonons and topological magnons. Exploiting this feature along with our finding of Rayleigh-like edge phonons in armchair ribbons, we demonstrate the existence of chiral edge modes with a phononic character. We predict that these modes mediate a chirality in the coherent phonon response and suggest measuring this effect via elastic transducers. These findings reveal a possible approach towards heat management in future devices.
Chiral Phonon Transport Induced by Topological Magnons
Even Thingstad et al.
Phys. Rev. Lett. 122, 107201 (2019)
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.122.107201
范德瓦尔斯层间反铁磁
MnBi2Te4薄膜的独特厚度依赖性
Otrokov等人使用密度泛函理论和蒙特卡罗计算，研究了范德瓦尔斯层间反铁磁体在二维极限下磁性和电子性质的厚度依赖性。以MnBi2Te4作为模型材料，他们发现它表现出一类显著的具有厚度依赖的磁性和拓扑相变。虽然MnBi2Te4的单个七层层块是拓扑平庸的铁磁体，但由奇数（偶数）块构成的厚膜则是未补偿的（补偿的）层间反铁磁体，显示出宽带隙量子反常霍尔（零平台量子反常霍尔）态。因此，MnBi2Te4是第一个被预测可以本征实现零平台量子反常霍尔态的化学计量材料。这种态理论上已经被表明可以承载奇异的轴子绝缘体相。（方子明）
Unique Thickness-Dependent Properties of the van der Waals Interlayer Antiferromagnet MnBi2Te4Films
M. M. Otrokov et al.
Phys. Rev. Lett. 122, 107202 (2019)
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.122.107202
奈尔型斯格明子主体材料GaV4S8中
光学驱动的集体自旋激发和磁矩动力学
GaV4S8 is a multiferroic semiconductor hosting magnetic cycloid (Cyc) and Néel-type skyrmion lattice (SkL) phases with a broad region of thermal and magnetic stability. Here, we use time-resolved magneto-optical Kerr spectroscopy to show the coherent generation of collective spin excitations in the Cyc and SkL phases. Our micromagnetic simulation sreveal that these are driven by an optically induced modulation of uniaxial anisotropy. Our results shed light on spin dynamics in anisotropic material shosting skyrmions and pave a new pathway for the optical manipulation of their magnetic order.
Optically Driven Collective Spin Excitations and Magnetization Dynamics in the Néel-type Skyrmion Host GaV4S8
P. Padmanabhan et al.
Phys. Rev. Lett. 122, 107203 (2019)
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.122.107203
单量子点诱导的Wigner时间延迟
Resonant scattering of weak coherent laser pulseson a single two-level system realized in a semiconductor quantum dot is investigated with respect to a time delay between incoming and scattered light. This type of time delay was predicted by Wigner in 1955 for purely coherent scattering and was confirmed for an atomic system in 2013 . In the presence of electron-phonon interaction, we observe deviations from Wigner’s theory related to incoherent and strongly non-Markovian scattering processes which are hard to quantify via adetuning-independent pure dephasing time. We observe detuning-dependent Wignerdelays of up to 530 ps in our experiments which are supported quantitatively by microscopic theory allowing for pure dephasing times of up to 950 ps.
Wigner Time Delay Induced by a Single Quantum Dot
Max Strauβ et al.
Phys. Rev. Lett. 122, 107401 (2019)
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.122.107401
与超表面耦合的GaAs中
由太赫兹驱动的相干光学声子放大
Woerner等人使用双色二维光谱证明了与金属超表面耦合的GaAs结构中的纵向光学声子可以通过其与电子等离子体的极化光学相互作用进行放大。超材料共振器增强了宽带太赫兹场，从而产生相干的纵向光学声子并驱动GaAs导带中的自由电子。纵向光学声子幅度的时间演化可以通过中红外脉冲测量其诱导出的Kerr非线性来获得。测量结果表明纵向光学声子最多可被放大10倍，与理论估计值相符。（李松）