Study of Novel Quantum Phenomena in Helium Confined in Nano-Structures
纳米结构中限制的氦中新量子现象的研究
基本信息
- 批准号:16204028
- 负责人:
- 金额:$ 29.7万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research (A)
- 财政年份:2004
- 资助国家:日本
- 起止时间:2004 至 2006
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
This research project was planned to study and search for various novel quantum phenomena in helium (^4He) confined in nanoporous structures. The project involves mainly five subjects. The outcome are as follows:1. ^4He in nano-porous glass : (A) The liquid-solid phase boundary was determined by isochoric pressure measurements. We have discovered a peak in heat capacity of confined ^4He at much higher temperatures than the superfluid transition temperature. The heat capacity peak definitely shows the formation of localized Bose-Einstein condensates in nanopores. (B) We developed a new simultaneous measurement technique of torsional oscillator and ultrasound. By this technique we have found that the superfluid transition temperature is independent of frequency, but has a strong porous sample dependence. (C) We have succeeded to control the pore size of the nanoporous glass by preplating a few atomic layers of Krypton atoms. The superfluid transition temperature decreases after preplatin … More g, indicating that the decrease of the effective pore size suppress superfluidity.2. Search for quantum effects in hydrogen (H_2) in nanoporous glasses : Aiming at searching for BEC and superfluidity in molecular hydrogen, we have studied the pore size dependence of supercooling of liquid H_2 by isochoric pressure measurements. We have found that the majority of supercooled H_2 solidify at around 9 K. However, a small amount of H_2, probably confined in narrowest pores, remains liquid down to about 7 K in 2.5-nm porous glass. This indicates that BEC can be observed by confining H_2 in uniform pores narrower than 2.5 nm.3. Superfluidity of ^4He in one-dimensional nanopores: Torsional oscillator studies for ^4He in 1D nanopores in FSM-16 revealed that superfluidity is dramatically suppressed by pressurizing liquid, with Tc reaching 0 K at around 2 Mpa. This is second example of quantum superfluid transition of confined ^4He.4. ^4He in regular 3D pore structure : Torsional oscillator and pressure experiments are underway.5. Supersolid studies of ^4He : We have conducted torsional oscillator experiments for bulk solid ^4He and solid in nano porous glasses. The former study revealed strong dependence of supersolid behaviors on sample history. Less
该研究项目计划研究和寻找限制在纳米多孔结构中的氦 (^4He) 中的各种新颖的量子现象。该项目主要涉及五个课题。研究结果如下: 1. ^4He 在纳米多孔玻璃中:(A) 通过等容压测量确定液-固相边界。我们发现受限 ^4He 的热容量在比超流体转变温度高得多的温度下出现峰值。热容峰明确表明纳米孔中局部玻色-爱因斯坦凝聚体的形成。 (B) 我们开发了一种新的扭转振荡器和超声波同步测量技术。通过这种技术,我们发现超流体转变温度与频率无关,但具有很强的多孔样品依赖性。 (C) 我们通过预镀几个氪原子原子层成功地控制了纳米多孔玻璃的孔径。预铂后超流转变温度降低... More g,表明有效孔径的减小抑制了超流性。2.寻找纳米多孔玻璃中氢(H_2)的量子效应:为了寻找氢分子中的BEC和超流性,我们通过等容压测量研究了液体H_2过冷的孔径依赖性。我们发现大部分过冷的H_2在9 K左右凝固。然而,少量的H_2可能限制在最窄的孔隙中,在2.5 nm多孔玻璃中直到7 K左右仍保持液态。这表明通过将H_2限制在小于2.5 nm的均匀孔隙中可以观察到BEC。3。一维纳米孔中 ^4He 的超流性:FSM-16 中一维纳米孔中 ^4He 的扭转振荡器研究表明,超流性受到液体加压的显着抑制,Tc 在 2 Mpa 左右达到 0 K。这是受限^4He.4 量子超流体跃迁的第二个例子。 ^4He 具有规则的 3D 孔隙结构:扭转振荡器和压力实验正在进行中。5。 ^4He 的超固体研究:我们对块状固体^4He 和纳米多孔玻璃中的固体进行了扭转振荡器实验。前一项研究揭示了超固体行为对样本历史的强烈依赖性。较少的
项目成果
期刊论文数量(56)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
4^He in Nano-Porous Media : Superfluidity and Quantum Phase Transition
纳米多孔介质中的 4^He:超流性和量子相变
- DOI:
- 发表时间:2007
- 期刊:
- 影响因子:0
- 作者:K. Shimizu;T. Gotohda;T. Matsushita N. Wada;W. Fujita;K. Awaga;Y. Saiga;and D. S. Hirashima;藤原裕也;K. Hicks et al. (15番目);H.Tamura;Masanori Harada and Masaru Tsukada;T.Nakano;H.Saito;K.Shirahama
- 通讯作者:K.Shirahama
Suppression of Freezing and Emergence of a Novel Ordered State in 4^He Confined in a Nano-porous Material
纳米多孔材料中限制的 4^He 中冻结的抑制和新型有序态的出现
- DOI:
- 发表时间:2006
- 期刊:
- 影响因子:0
- 作者:K.Yamamoto;Y.Shibayama;K.Shirahama
- 通讯作者:K.Shirahama
Thermodynamic Evidence for Nanoscale Bose-Einsteir Condensation in ^4He Confined in Nanoporous Media
纳米多孔介质中^4He 中纳米级玻色-爱因斯坦凝聚的热力学证据
- DOI:
- 发表时间:2008
- 期刊:
- 影响因子:0
- 作者:Keiichi;Yamamoto;Yoshiyuki;Shibayama;Keiya;Shirahama
- 通讯作者:Shirahama
Superfluidity of 4He Confined in Nano-Porous Media
纳米多孔介质中 4He 的超流性
- DOI:
- 发表时间:2008
- 期刊:
- 影响因子:0
- 作者:*K. Shirahama;K. Yamamoto;Y. Shibayama
- 通讯作者:Y. Shibayama
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SHIRAHAMA Keiya其他文献
SHIRAHAMA Keiya的其他文献
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{{ truncateString('SHIRAHAMA Keiya', 18)}}的其他基金
Cross correlations of electric, magnetic and flow fields in superfluid helium
超流氦中电场、磁场和流场的互相关
- 批准号:
24654110 - 财政年份:2012
- 资助金额:
$ 29.7万 - 项目类别:
Grant-in-Aid for Challenging Exploratory Research
Development of Novel Refrigeration Method and Helium. Quasiparticle Spintronics using Nanopores
新型制冷方法和氦气的开发。
- 批准号:
22654041 - 财政年份:2010
- 资助金额:
$ 29.7万 - 项目类别:
Grant-in-Aid for Challenging Exploratory Research
Nanoscale Helium Physics and Its Applications
纳米氦物理及其应用
- 批准号:
21224010 - 财政年份:2009
- 资助金额:
$ 29.7万 - 项目类别:
Grant-in-Aid for Scientific Research (S)
Study of Quantum Surfaces and Interfaces using a Scanning Probe Microscope Working at Very Low Temperatures
使用在极低温度下工作的扫描探针显微镜研究量子表面和界面
- 批准号:
19340101 - 财政年份:2007
- 资助金额:
$ 29.7万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Novel Quantum Many-Body Phenomena in Helium Nanostructures
氦纳米结构中的新型量子多体现象
- 批准号:
17071010 - 财政年份:2005
- 资助金额:
$ 29.7万 - 项目类别:
Grant-in-Aid for Scientific Research on Priority Areas
Quantum Many - Body Effect of Two - Dimensional Electron Systems on Helium Films
氦薄膜上二维电子系统的量子多体效应
- 批准号:
14340110 - 财政年份:2002
- 资助金额:
$ 29.7万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Dynamics of the Wigner Electron Crystal on Liquid Helium Surfaces
液氦表面维格纳电子晶体的动力学
- 批准号:
11440102 - 财政年份:1999
- 资助金额:
$ 29.7万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Sliding and Nonlinear Transport in the Wigner Solid on a Liquid Helium Surface
液氦表面维格纳固体的滑动和非线性输运
- 批准号:
07640464 - 财政年份:1995
- 资助金额:
$ 29.7万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
相似海外基金
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2141774 - 财政年份:2022
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Superfluidity in Helium Nanodroplets
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