1、无液氦低温强磁场共聚焦显微镜 - attoCFM

2、低温强磁场原子力/磁力/扫描霍尔显微镜 - attoAFM/attoMFM/attoSHPM

3、磁共振显微镜/低温强磁场磁共振显微镜 - attoCSFM

4、低震动无液氦磁体与恒温器 - attoDRY系列

5、atto3DR低温双轴旋转台

■  低温共聚焦显微镜助力设计光电子器件的范德瓦尔斯界面

基于二维材料的范德瓦尔斯界面在光电子器件领域具有广泛的发展前景，不同材料组成的界面可以在很大程度上调控器件的发光光谱范围。然而，层间堆叠方式不同带来的晶格失配以及错位都会抑制电子与声子耦合作用，影响光电器件的工作效率。瑞士日内瓦大学的的Alberto F. Morpurgo 教授课题组在《自然-材料》杂志上发表了低温光致发光光谱研究设计范德瓦尔斯界面的工作。通过组合导带底部与价带顶部都在Γ点（倒格矢空间）的二维晶体材料，形成范德瓦尔斯界面，避免了动量失配。这样的范德瓦尔斯界面将不受光学跃迁与晶格常数、两层材料之间旋转角或者晶格错位的影响，为基于二维原子晶体的光电子器件的发展打下了重要的基础。

图1. 温度5K时双层InSe与双层WS₂范德瓦尔斯界面的光致发光光谱

图2. 双层InSe与双层WS₂范德瓦尔斯界面光谱随温度变化研究

参考文献：

[1]. Nicolas Ubrig  et al, Design of van der Waals interfaces for broad spectrum optoelectronics, Nature Materials,19,299–304 (2020) 

■  偏振微腔中的寻求最佳单光子源, 寻求量子霸权

单光子源是未来量子信息器件的基础单元。先进的实现方法要求单光子源必须同时具有高效以及不可分辨性。为了优化固态单光子源，中国科技技术大学的潘建伟院士以及陆朝阳教授团队，展示了从椭圆微柱器件发出的无背景（双干涉激发）且具有不可分辨性的极性单光子源。实验中的光学测量，是基于德国attocube公司的无液氦闭循环低温恒温器attoDRY2100以及共聚焦显微镜attoCFM I进行的。通过测量，课题组展示了最前沿的椭圆微柱器件发出的极性单光子源具有60%的效率，并且不可分辨性高达0.975。该单光子源首次实现了20个光子的量子光学实验，寻求实现量子霸权。

参考文献：

1. Chaoyang LU, et al. Nature Photonics, 13, 770–775 (2019)

2. Hui Wang et al; Phys. Rev. Lett. 123, 250503 (2019)

3. Yu-Ming He et al; Nature Physics, 15, 941–946 (2019) 

■  发现金属绝缘转变的中间态

低温强磁场原子力显微镜attoAFM/磁力显微镜attoMFM

通常，一阶金属-绝缘体转变表明金属态与绝缘相可以在超快的时间尺度内共存。来自上海复旦大学的沈健教授以及殷立峰课题组发现了La_0.325Pr_0.3Ca_0.375MnO₃材料在光诱导下的一阶金属-绝缘相变中可以存在长时间稳定的第三种中间态。这个实验结果表明，铁磁金属态与电荷有序绝缘态两种不同态之间存在一定的联系。

左图: 左上角器件示意图，光纤引入激光照射到样品表面； 不同光强度下，MFM磁力显微镜数据表明样品中存在三种不同相态的存在，三种相态分别是铁磁金属态，电荷有序绝缘态以及中间态。右图：图左MFM磁力显微镜数据：1是铁磁金属态，2是中间态，3是电荷有序绝缘态。图右：三种不同态在不同光照强度下的强度变化。

德国attocube公司的低温强磁场原子力显微镜attoAFM使用双通道模式可以同时测量样品的表面形貌以及样品的磁畴分布，空间分辨率可以达到纳米尺度。结合磁力显微镜成像与磁光克尔（MOKE）测量，课题组作者鉴定了中间态是铁磁金属态与电荷有序绝缘态的共存状态。该实验发现在一阶金属绝缘中开创了两个完全不同的相变态的共存。下一步，该实验结果可以被参考用于研究其他凝聚态材料中的一阶金属绝缘相变。

参考文献：

[1] LiFeng YIN, et al. Unexpected Intermediate State Photoinduced in the Metal-Insulator Transition of Submicrometer Phase-Separated Manganites, Physical Review Letters, 120, 267202 (2018).

更多应用案例，请您致电 010-85120277/78/79/80 或 写信至 info@qd-china.com 获取。

超低震动闭循环低温恒温器：扫描探针显微成像

attoDRY低温恒温器是闭循环显微镜的一个标杆产品。该设备提供了超低震动的扫描探针显微成像测量平台，操作无需液氦。显微镜插杆被交换气体冷却到本底温度时，9T磁场可以施加。由于特殊的设计，冷头引入的振动在样品区域被机械隔离开。

当使用低温原子力显微镜attoAFM I测量的时候，可以测定振动幅度小于150pm（工作带宽200Hz, Z方向振幅，接触模式AFM）。不止是样品区域与冷头振动的机械隔离，attoDRY的制冷性能也十分优异。样品插杆冷却的时间1小时。下图为attoAFM I低温原子力显微镜在attoDRY内测量的噪音数据（图左b)与AFM形貌图(图右上a）。

2021年

• Yu YE , et al; Odd-Even Layer-Number Effect and Layer-Dependent Magnetic Phase Diagrams in MnBi2Te4, Phys. Rev. X 11, 011003, (2021)

• Xiaodong XU, et al; Direct observation of two-dimensional magnons in atomically thin CrI3, Nature Physics 17, 20–25(2021)

2020年

• Yanhao Tang , et al; Simulation of Hubbard model physics in WSe2/WS2 moiré superlattices, Nature, 579, 353–358(2020)

• Yang XU, et al;Correlated insulating states at fractional fillings of moiré superlattices,Nature, 587, 214–218(2020)

• Shengwei JIANG, et al; Exchange magnetostriction in two-dimensional antiferromagnets,Nature Materials, 19, 1295–1299(2020)

• Xiaoxiao ZHANG, et al; Gate-tunable spin waves in antiferromagnetic atomic bilayers,Nature Materials 19, 838–842(2020)

• Nicolas Ubrig , et al; Design of van der Waals interfaces for broad spectrum optoelectronics, Nature Materials,19,299–304 (2020)

• Xiaodong XU, et al; Magnetic proximity and nonreciprocal current switching in a monolayer WTe2 helical edge,Nature Materials  19, 503–507(2020)

• Yu YE , et al; A quaternary van der Waals ferromagnetic semiconductor AgVP2Se6, Advanced Functional Materials, 30, 1910036 (2020)

• Xiaodong XU , et al; Valley phonons and exciton complexes in a monolayer semiconductor，Nature Communications 11,  618 (2020)

• Mingyuan HUANG, et al; Probing the Ferromagnetism and Spin Wave Gap in VI3 by HelicityResolved Raman Spectroscopy.Nano Lett. 2020, 20, 6024−6031

• Mingyuan HUANG, et al; Magnetic Order-Induced Polarization Anomaly of Raman Scattering in 2D Magnet CrI3. Nano Lett. 2020, 20, 729−734

2019年及之前

• Tingxin LI, , et al; Pressure-controlled interlayer magnetism in atomically thin CrI3,Nature Materials18, 1303–1308(2019)

• Xiaodong XU, et al; Switching 2D magnetic states via pressure tuning of layer stacking. Nature Materials 18,1298–1302(2019)

• Shengwei JIANG, et al; Spin tunnel field-effect transistors based on two-dimensional van der Waals heterostructures, Nature Electronics 2, 159–163(2019)

• Chaoyang Lu et.al, Coherently driving a single quantum two-level system with dichromatic laser pulses, Nature Physics, 15,941-945,(2019)

• Chaoyang Lu et.al, Towards optimal single-photon sources from polarized microcavities. Nature Photonics, 13, 770–775 (2019)

• Chaoyang LU, et al; Boson Sampling with 20 Input Photons and a 60-Mode Interferometer in a 1014-Dimensional Hilbert Space. Phys. Rev. Lett. 123, 250503 (2019)

• Yuanbo Zhang , et al; Evidence of a gate-tunable Mott insulator in a trilayer graphene moiré superlattice. Nature Physics  15, 237–241(2019)

• Hyun Ho Kim, et al; Evolution of interlayer and intralayer magnetism in three atomically thin chromium trihalides, PNAS , 2019 116 (23) 11131-11136

• Xiaodong XU, et al; Voltage Control of a van der Waals Spin-Filter Magnetic Tunnel Junction，Nano Lett. 2019, 19, 2, 915–920

• Yuanbo Zhang et. Al, “Signatures of tunable superconductivity in a trilayer graphene moiré superlattice”Nature, 572, 215-219 (2019)

• P. Maletinsky et. Al, Probing magnetism in 2D materials at the nanoscale with single-spin microscopy, Science, 364, 973 (2019)

• Haomin WANG et al, “Isolating hydrogen in hexagonal boron nitride bubbles by a plasma treatment”.Nature communications, 10, 2815 (2019)

• Mingyuan Huang et.al, Magnetic Order-Induced Polarization Anomaly of Raman Scattering in 2D Magnet CrI3, Nano Letters, 2020,20,1, 729-734

• Alexander Högele et. al, Cavity-control of interlayer excitons in van der Waals heterostructures, Nature communications, 2019,10:3697.

• Hanxuan Lin, et al. Unexpected Intermediate State Photoinduced in the Metal-Insulator Transition of Submicrometer Phase-Separated Manganites. Phys. Rev. Lett. 120, 267202(2018)

• Chaoyang Lu et.al, High-efficiency multiphoton boson sampling. Nature Photonics, 11, 361-365, (2017)

• K. Yasuda, et al. Quantized chiral edge conduction on domain walls of a magnetic topological insulator. Science 2017, 358, 1311-1314

• Zhu, Y. et al. Chemical ordering suppresses large-scale electronic phase separation in doped manganites. Nature communications, 2016,7:11260.

• Yang, W.;et al. Electrically Tunable Valley-Light Emitting Diode (vLED) Based on CVD-Grown Monolayer WS2. Nano Letters 2016, 16, 1560-1567.

• Surajit Saha; et al. Long-range magnetic coupling across a polar insulating layer, Nature communications, 2016,7:11015.

• He, Y. M.; et al. Single quantum emitters in monolayer semiconductors. Nature Nanotechnology 2015, 10, 497-502.

• Nazin, G.; et al. Visualization of charge transport through Landau levels in graphene. Nature Physics 2010, 6, 870-874.

• Proton magnetic resonance imaging using a nitrogen–vacancy spin sensor. Nature   Nanotechnology, 2015,10,120-124.

• Nanoscale nuclear magnetic imaging with chemical contrast. Nature Nanotechnology, 2015, 10, 125-128.

• Observation of biexcitons in monolayer WSe2. Nature Physics, 2015, 11, 477-481.

• Visualization of a ferromagnetic metallic edge state in manganite strips. Nature Communications, 2015, 6:6179.

• Observation of Excitonic Fine Structure in a 2D Transition-Metal   Dichalcogenide Semiconductor. ACS Nano, 2015, 9, 647-655.

• Energy losses of nanomechanical resonators induced by atomic force   microscopy-controlled mechanical impedance mismatching. Nature Communications, 2014, 5:3345.

• Deterministic and electrically tunable bright single-photon source. Nature Communications, 2014, 5:3240.

• Dynamic Visualization of Nanoscale Vortex Orbits. ACS Nano, 2014, 8, 2782-2787.

• Transition from slow Abrikosov to fast moving Josephson vortices in iron   pnictide superconductors. Nature Materials, 2013, 12, 134-138.

• Stray-field imaging of magnetic vortices with a single diamond spin. Nature Communications, 2013, 4:2279.

• Realization of pristine and locally tunable one-dimensional electron   systems in carbon nanotubes. Nature Nanotechnology, 2013, 8, 569-574.

• Strong magnetophonon resonance induced triple G-mode splitting in   graphene on graphite probed by micromagneto Raman spectroscopy. Physical Review B, 2013, 88, 165407.

• Origin of negative magnetoresistance of GaAs/(Ga,Mn)As core-shell   nanowires. Physical Review B, 2013, 87, 245303.

• Magnetic Imaging on the Nanometer Scale Using Low-Temperature Scanning Probe Techniques. Microscopy Today, 2011, 19, 34-38.

• Visualization of charge transport through Landau levels in graphene. Nature Physics, 2010, 6, 870-874.

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