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Photovoltage microscopy of symmetrically twisted trilayer graphene 对称扭曲三层石墨烯的光电压显微镜
IF 18.4 1区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY Pub Date : 2025-11-20 DOI: 10.1038/s41567-025-03071-9
Sergi Batlle Porro, Dumitru Călugăru, Haoyu Hu, Roshan Krishna Kumar, Niels C. H. Hesp, Kenji Watanabe, Takashi Taniguchi, B. Andrei Bernevig, Petr Stepanov, Frank H. L. Koppens
A full microscopic description of the correlated insulators and superconductivity that occur in the flat bands of magic angle twisted bilayer graphene has not yet been found. Electronic transport and scanning tunnelling microscopy experiments have suggested a dichotomy between local and extended electronic orbitals, but definitive evidence for the coexistence of these two carrier types is still sought after. Here we report local photothermoelectric measurements in the flat electronic bands of symmetrically twisted trilayer graphene. We observe oscillations of the Seebeck coefficient around integer fillings of the flat band, signalling the presence of electron correlations, coupled with a breakdown of the predictions of the Mott formula. Our measurements reveal an overall negative offset of the Seebeck coefficient and peaks of the local photovoltage values at all positive integer fillings of the moiré superlattice. This further indicates a deviation from the classical two-band semiconductor Seebeck response. Our findings may be interpreted using the heavy-fermion model in the topological flat bands of moiré graphene and highlight an avenue to apply local thermoelectric measurements to other strongly correlated materials. A proposed theoretical explanation for the electronic behaviour of moiré graphene is the coexistence of light and heavy electrons. Now local thermoelectric measurements hint that this model could be accurate.
在魔角扭曲双层石墨烯的平带中,相关绝缘体和超导性的完整微观描述尚未被发现。电子输运和扫描隧道显微镜实验已经提出了局部电子轨道和扩展电子轨道之间的二分法,但这两种载流子类型共存的确切证据仍在寻找中。在这里,我们报告了在对称扭曲的三层石墨烯的平面电子带中的局部光热电测量。我们观察到塞贝克系数在平面带的整数填充周围的振荡,这表明存在电子相关性,同时也打破了莫特公式的预测。我们的测量揭示了塞贝克系数的总体负偏移,以及在所有莫尔维尔超晶格的正整数填充处局部光电压值的峰值。这进一步表明了与经典双波段半导体塞贝克响应的偏差。我们的研究结果可以用moir石墨烯拓扑平坦带中的重费米子模型来解释,并强调了将局部热电测量应用于其他强相关材料的途径。提出了一种理论解释,可以解释波纹石墨烯的电子行为是轻电子和重电子的共存。现在,局部热电测量表明,这个模型可能是准确的。
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引用次数: 0
A charge transfer mechanism for optically addressable solid-state spin pairs 光学可寻址固态自旋对的电荷转移机制
IF 18.4 1区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY Pub Date : 2025-11-19 DOI: 10.1038/s41567-025-03091-5
Islay O. Robertson, Benjamin Whitefield, Sam C. Scholten, Priya Singh, Alexander J. Healey, Philipp Reineck, Mehran Kianinia, Gergely Barcza, Viktor Ivády, David A. Broadway, Igor Aharonovich, Jean-Philippe Tetienne
Bright point-defect emitters in hexagonal boron nitride have potential applications in quantum sensing and other technologies. However, it can be difficult to correctly identify the microscopic nature of observed defects, creating challenges for further development. A class of bright emitters exhibiting optically detected magnetic resonance with no resolvable zero-field splitting has been observed in hexagonal boron nitride across a broad range of wavelengths. However, the microscopic structure of the defects and the physical origin of their optically detected magnetic resonance signal have still not been identified. Here we describe a model that accounts for and provides a physical explanation for all key experimental features of the spin-resolved photodynamics of ensembles and single emitters. The model, inspired by the radical-pair mechanism from spin chemistry, assumes a pair of nearby point defects, one of which is optically active. Using first-principles calculations, we show that simple defect pairs made of common carbon defects provide a plausible realization of our model. As well as addressing open questions about defects in hexagonal boron nitride, our model may also explain similar phenomena observed in other wide-bandgap semiconductors. Optical spin defects in semiconductors are crucial for applications, but it is often difficult to establish their microscopic origin. A mechanism for the spin behaviour of a family of bright emitters in hexagonal boron nitride has now been identified.
六方氮化硼的亮点缺陷发射体在量子传感和其他技术中具有潜在的应用前景。然而,正确识别观察到的缺陷的微观性质是很困难的,这给进一步的开发带来了挑战。在六方氮化硼中,在宽波长范围内观察到一类具有光学探测磁共振且无可分辨零场分裂的明亮发射体。然而,缺陷的微观结构及其光学检测磁共振信号的物理来源仍未被确定。在这里,我们描述了一个模型,该模型解释了自旋分辨光动力学的所有关键实验特征,并为其提供了物理解释。该模型受到自旋化学中的自由基对机制的启发,假设附近有一对点缺陷,其中一个是光学活性的。使用第一性原理计算,我们表明由常见碳缺陷组成的简单缺陷对提供了我们模型的合理实现。除了解决有关六方氮化硼缺陷的开放问题外,我们的模型还可以解释在其他宽带隙半导体中观察到的类似现象。半导体中的光学自旋缺陷在应用中是至关重要的,但通常很难确定其微观起源。六方氮化硼中一类明亮发射体的自旋行为机制现已确定。
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引用次数: 0
Observation of a dynamic transition in bulk supercooled water 散装过冷水中动态转变的观察
IF 18.4 1区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY Pub Date : 2025-11-19 DOI: 10.1038/s41567-025-03112-3
R. Tyburski, M. Shin, S. You, K. Nam, M. Soldemo, A. Girelli, M. Bin, S. Lee, I. Andronis, Y. Han, S. Jeong, R. A. Oggenfuss, R. Mankowsky, D. Babich, X. Liu, S. Zerdane, T. Katayama, H. Lemke, F. Perakis, A. Nilsson, K. H. Kim
The fragile-to-strong transition in supercooled water, where the relaxation dynamics shift from non-Arrhenius to Arrhenius behaviour, has been hypothesized to explain its anomalous dynamic properties. However, this transition remains unresolved, as previous ultrafast experimental studies of bulk water dynamics were limited to temperatures far from the proposed transition due to rapid crystallization. Here we use an infrared laser pump and an ultrashort X-ray probe to measure the structural relaxation in micrometre-sized water droplets, evaporatively cooled at timescales ranging from femtoseconds to nanoseconds. Our experimental data show a dynamic crossover at around 233 K. Below this temperature, the relaxation dynamics deviate from simple power-law fits and follow a shallower temperature dependence. Molecular dynamics simulations successfully reproduce our findings. Water has remarkable dynamic properties; a transition from a fragile to a strong liquid has been proposed to explain how they change on cooling. Experiments now show evidence for such a transition in bulk supercooled water at around 233 K.
在过冷水中,松弛动力学从非阿伦尼乌斯行为转变为阿伦尼乌斯行为,这一脆弱到强的转变已经被假设来解释其异常动力学性质。然而,这种转变仍然没有得到解决,因为之前的体水动力学的超快实验研究仅限于温度,而不是由于快速结晶而提出的转变。在这里,我们使用红外激光泵和超短x射线探针来测量微米大小的水滴的结构弛豫,蒸发冷却的时间尺度从飞秒到纳秒不等。我们的实验数据显示在233 K左右有一个动态交叉。在此温度以下,弛豫动力学偏离简单的幂律拟合,并遵循较浅的温度依赖性。分子动力学模拟成功地再现了我们的发现。水具有显著的动态特性;有人提出从易碎液体到强液体的转变来解释它们在冷却时的变化。现在的实验表明,在233 K左右的散装过冷水中存在这种转变的证据。
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引用次数: 0
A cornerstone of entanglement theory restored 恢复了纠缠理论的基石
IF 18.4 1区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY Pub Date : 2025-11-18 DOI: 10.1038/s41567-025-03084-4
Matthias Christandl
The second law of thermodynamics says that entropy may only ever increase during the conversion of one physical state into another. Finding an analogous quantity to characterize the conversion of entangled quantum states has been a rollercoaster ride.
热力学第二定律指出,熵只会在一种物理状态转变为另一种物理状态的过程中增加。寻找一个类似的量来描述纠缠量子态的转换就像坐过山车一样。
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引用次数: 0
Effective bands and band-like electron transport in amorphous solids 非晶固体中的有效能带和类能带电子输运
IF 18.4 1区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY Pub Date : 2025-11-17 DOI: 10.1038/s41567-025-03099-x
Matthew Jankousky, Dimitar Pashov, João H. Mazo, Ross E. Larsen, Vladimir Dobrosavljević, Mark van Schilfgaarde, Vladan Stevanović
The localization of electrons caused by atomic disorder is a well-known phenomenon. However, under which circumstances electrons remain delocalized and retain band-like characteristics even when the crystal structure is completely absent, as found in certain amorphous solids, is less well understood. Here, to probe this phenomenon, we develop a fully first-principles description of the electronic structure and charge transport in amorphous materials, which combines a representation of the amorphous state as a composite (ensemble) of local environments and the state-of-the-art many-body electronic structure methods. Using amorphous In2O3 as an example, we demonstrate the accuracy of our approach in reproducing the band-like nature of the conduction electrons as well as their disorder-limited mobility. Our approach reveals the physical origins responsible for the electron delocalization and survival of the band dispersions despite the absence of long-range order. The standard band structure picture cannot be applied to amorphous materials as they lack crystal symmetry. Now a first-principles approach that captures the possibility of band-like electron transport in amorphous solids is presented, with In2O3 as an example.
原子无序引起的电子局域化是一种众所周知的现象。然而,在这种情况下,即使晶体结构完全不存在,电子仍然保持离域并保持带状特征,就像在某些非晶固体中发现的那样,人们对这种情况的理解还不太清楚。在这里,为了探索这一现象,我们发展了非晶材料中电子结构和电荷输运的完整第一性原理描述,它结合了非晶状态作为局部环境的复合(系综)的表示和最先进的多体电子结构方法。以无定形In2O3为例,我们证明了我们的方法在再现导电电子的带状性质以及它们的无序受限迁移率方面的准确性。我们的方法揭示了导致电子离域和频带色散存在的物理根源,尽管缺乏长程有序。标准能带结构图不能应用于非晶材料,因为它们缺乏晶体对称性。现在,以In2O3为例,提出了一种第一性原理方法,可以捕获非晶固体中带状电子传递的可能性。
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引用次数: 0
Attosecond physics in optical near fields 光学近场中的阿秒物理
IF 18.4 1区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY Pub Date : 2025-11-12 DOI: 10.1038/s41567-025-03093-3
Jonas Heimerl, Stefan Meier, Anne Herzig, Felix López Hoffmann, Lennart Seiffert, Daniel M. B. Lesko, Simon Hillmann, Simon Wittigschlager, Tobias Weitz, Thomas Fennel, Peter Hommelhoff
Attosecond science—the control of electrons by ultrashort laser pulses—is developing into lightfield-driven, or petahertz, electronics. Optical-field-driven nanostructures provide elements for such electronics, which rely on understanding electron dynamics in the optical near field. Here we report near-field-induced low-energy stripes in carrier-envelope-phase-dependent electron spectra—a spectral feature that appears in the direct electrons emitted from a strongly driven nanostructure. These stripes arise from the subcycle sensitivity of the ponderomotive acceleration of electrons injected into a strong near-field gradient by a few-cycle optical waveform. They allow the tracking of direct and rescattered electron emissions on subcycle timescales and provide access to the electron momentum width at emission. Because this effect occurs in the direct electron signal, a large fraction of the emitted electrons can be steered, enabling the isolation of individual attosecond electron bursts with high charge density. Attosecond control of electrons in nanostructures requires resolving dynamics in the optical near field. Now, an experiment finds low-energy spectral stripes that track subcycle electron emission and allow the isolation of attosecond electron bursts.
阿秒科学——用超短激光脉冲控制电子——正在发展成为光场驱动的电子技术。光场驱动的纳米结构为这种电子学提供了元素,这依赖于对光学近场电子动力学的理解。在这里,我们报告了载流子包络相相关电子能谱中的近场诱导低能条纹-一种出现在强驱动纳米结构发射的直接电子中的光谱特征。这些条纹的产生是由于电子的质心加速度的亚周期灵敏度,这些电子被注入到强近场梯度中,这是由几个周期的光学波形引起的。它们允许在亚周期时间尺度上跟踪直接和重新散射的电子发射,并提供对发射时电子动量宽度的访问。由于这种效应发生在直接电子信号中,因此可以控制发射电子的很大一部分,从而能够隔离具有高电荷密度的单个阿秒电子爆发。
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引用次数: 0
The prize at the end of the quantum tunnel 量子隧道尽头的奖品
IF 18.4 1区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY Pub Date : 2025-11-11 DOI: 10.1038/s41567-025-03119-w
The 2025 Nobel Prize in Physics has been awarded to John Clarke, Michel Devoret and John Martinis “for the discovery of macroscopic quantum mechanical tunnelling and energy quantisation in an electric circuit”.
2025年诺贝尔物理学奖被授予约翰·克拉克、米歇尔·德沃雷特和约翰·马提尼斯,以表彰他们“在电路中发现宏观量子力学隧穿和能量量子化”。
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引用次数: 0
Field-tunable valley coupling in a dodecagonal semiconductor quasicrystal 十二角半导体准晶体中的场可调谐谷耦合
IF 18.4 1区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY Pub Date : 2025-11-11 DOI: 10.1038/s41567-025-03080-8
Zhida Liu, Qiang Gao, Yanxing Li, Giovanny Espitia, Xiaohui Liu, Chuqiao Shi, Fan Zhang, Dong Seob Kim, Yue Ni, Miles Mackenzie, Hamza Abudayyeh, Kenji Watanabe, Takashi Taniguchi, Yimo Han, Mit H. Naik, Chih-Kang Shih, Eslam Khalaf, Xiaoqin Li
Quasicrystals are characterized by atomic arrangements having long-range order without periodicity. Van der Waals bilayers provide an opportunity to controllably vary the atomic alignment between two layers from a periodic moiré crystal to an aperiodic quasicrystal. Here we reveal that in a dodecagonal WSe2 quasicrystal, two separate valleys in separate layers are brought arbitrarily close in momentum space through higher-order Umklapp scatterings. A modest perpendicular electric field is then sufficient to induce strong interlayer valley hybridization, manifested as another hybrid excitonic doublet. Concurrently, we observe the disappearance of the trion that exists at low field, which we attribute to a modified spatial distribution of the wavefunction due to the quasicrystal potential. This is possibly a precursor to localization. Our findings highlight the ability of incommensurate systems to bring any pair of momenta into close proximity, thereby introducing opportunities for valley engineering. Lacking translational symmetry, the momentum-space description of quasicrystals is distinct from that of fully crystalline materials. Now, a quasicrystal with two 2D layers links different momenta from the individual layers, allowing new excitons to form.
准晶体的特征是原子排列具有长程有序而没有周期性。范德华双分子层提供了一个可以控制地改变两层之间原子排列的机会,从一个周期性的摩尔晶体到一个非周期性的准晶体。本文揭示了在十二角WSe2准晶体中,通过高阶Umklapp散射,在动量空间中使两个不同层的独立谷任意靠近。一个适度的垂直电场就足以诱导出强的层间谷杂化,表现为另一种杂化激子双偶态。同时,我们观察到存在于低场的三角消失,我们将其归因于准晶体势对波函数空间分布的修正。这可能是本地化的前兆。我们的研究结果强调了不相称系统将任何一对动量带入近距离的能力,从而为山谷工程提供了机会。由于缺乏平移对称性,准晶体的动量空间描述与全晶材料的动量空间描述不同。现在,具有两个二维层的准晶体将来自各个层的不同动量连接起来,从而形成新的激子。
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引用次数: 0
The beat of digital twins 数字双胞胎的节奏
IF 18.4 1区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY Pub Date : 2025-11-11 DOI: 10.1038/s41567-025-03085-3
Mark Buchanan
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引用次数: 0
On knowledge and spectacle 论知识与奇观
IF 18.4 1区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY Pub Date : 2025-11-11 DOI: 10.1038/s41567-025-03088-0
Urmila Chadayammuri
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引用次数: 0
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Nature Physics
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