Quantum Tunneling in One- and Three-Dimension Systems
一维和三维系统中的量子隧道
基本信息
- 批准号:9310260
- 负责人:
- 金额:$ 33万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Continuing Grant
- 财政年份:1993
- 资助国家:美国
- 起止时间:1993-08-01 至 1997-07-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
9310260 Goodkind This combined experimental and theoretical project will study quantum tunneling in a one-d model system and a three-d model system. The one-d system consists of electrons tunneling out of the shallow potential well associated with their image potential at the surface of helium. The three-d system is solid He-4. Electrons on helium represent a model system where tunneling rates can be measured as a function of applied electric field and electron density. This system is appropriate to study using the one-d time-dependent Schrodinger equation. Solid He-4 is the simplest possible solid in nature so that its properties provide fundamental understanding applicable to all solids. In He-4, lattice defects such as vacancies are expected to be delocalized as a result of their ability to tunnel between potential minima of the periodic lattice. However, experimental evidence about their concentration and their properties is limited and inconclusive. The proposed research is intended to resolve certain outstanding issues in both systems. Further, the tunneling phenomena are potentially of technological interest as microelectronic devices become smaller and tunneling between closely spaced structures more likely. %%% This is a combined experimental and theoretical which will study quantum tunneling in two model systems. Quantum tunneling is analogous to finding your car outside your garage in the front yard in the morning, even though it was left locked inside the night before. This macroscopic event is very unlikely, but if the car and surroundings are shrunk to atomic dimensions, tunneling becomes a measurable phenomenon, particularly at very low temperatures. In this work, one model system consists of electrons tunneling through a potential barrier to leave a surface. In the other model system, helium atoms in the solid tunnel from lattice sites (garages) to defects (front yards). In both cases, there are fundamental issues of both a theore tical and experimental nature that need to be resolved. Further, the tunneling phenomena are potentially of technological interest as microelectronics devices become smaller and tunneling between closely spaced structures more likely. ***
9310260古德金德这个实验和理论相结合的项目将研究一维模型系统和三维模型系统中的量子隧道效应。一维系统由电子在氦表面的像势相关联的浅势垒中隧穿而成。三维系统是固体He-4。氦上的电子代表了一个模型系统,其中隧穿速率可以作为外加电场和电子密度的函数来测量。该系统适合用一维含时薛定谔方程来研究。固体He-4是自然界中最简单的固体,因此它的性质提供了适用于所有固体的基本理解。在He-4中,像空位这样的晶格缺陷被认为是离域的,因为它们能够在周期晶格的势极小值之间隧穿。然而,关于它们的浓度和性质的实验证据是有限的,也是不确定的。拟议的研究旨在解决两个系统中的某些悬而未决的问题。此外,随着微电子设备变得更小,以及在紧密间隔的结构之间进行隧道传输的可能性更大,隧道现象可能会引起技术上的兴趣。这是一个实验和理论相结合的实验,将研究两个模型系统中的量子隧穿。量子隧道类似于早上在前院的车库外找到你的车,尽管它在前一天晚上被锁在里面。这种宏观事件不太可能发生,但如果汽车和周围环境缩小到原子尺寸,隧道效应就会成为一种可测量的现象,特别是在非常低的温度下。在这项工作中,一个模型系统由电子通过势垒隧道离开表面组成。在另一个模型系统中,固体中的氦原子从晶格位置(车库)隧道到缺陷(前院)。在这两种情况下,都有理论和实验性质的根本问题需要解决。此外,随着微电子设备变得更小,以及在紧密间隔的结构之间进行隧道传输的可能性更大,隧道现象可能会引起技术上的兴趣。***
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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John Goodkind其他文献
John Goodkind的其他文献
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{{ truncateString('John Goodkind', 18)}}的其他基金
Tests for BEC and/or Superfluid Behavior in Solid 4He
固体 4He 中的 BEC 和/或超流体行为测试
- 批准号:
0604295 - 财政年份:2006
- 资助金额:
$ 33万 - 项目类别:
Continuing Grant
Search for Bose-Einstein Condensation in Solid 'He'
在固体“He”中寻找玻色-爱因斯坦凝聚
- 批准号:
9802046 - 财政年份:1998
- 资助金额:
$ 33万 - 项目类别:
Standard Grant
Quantum Tunneling in Single Component Two-Dimensional and Three-Dimensional Systems
单组分二维和三维系统中的量子隧道
- 批准号:
8819507 - 财政年份:1989
- 资助金额:
$ 33万 - 项目类别:
Continuing Grant
Industry/University Cooperative Research Activity: Two- Dimension Electron System on Hydrogen and Acoustic Properties of Helium-Three (Materials Research)
产学合作研究活动:氢的二维电子系统和氦三的声学特性(材料研究)
- 批准号:
8503832 - 财政年份:1985
- 资助金额:
$ 33万 - 项目类别:
Continuing Grant
Acquisition of a Superconducting Gravimeter For Pinon Flat Observatory
为 Pinon Flat 天文台购置一台超导重力仪
- 批准号:
8407777 - 财政年份:1984
- 资助金额:
$ 33万 - 项目类别:
Standard Grant
Measurements of the Ordered Phases of Solid 3-Helium (Materials Research)
固体 3-氦有序相的测量(材料研究)
- 批准号:
8022590 - 财政年份:1981
- 资助金额:
$ 33万 - 项目类别:
Continuing Grant
Test of Gravitational Inverse Square Law Between Forty-Five Centimeters and One Meter
四十五厘米到一米之间引力平方反比定律的检验
- 批准号:
8008166 - 财政年份:1981
- 资助金额:
$ 33万 - 项目类别:
Standard Grant
The Application of the Superconducting Gravimeter to Improved Modeling of the Ocean Tides and Solid Earth
超导重力仪在改进海洋潮汐和固体地球建模中的应用
- 批准号:
8018760 - 财政年份:1980
- 资助金额:
$ 33万 - 项目类别:
Standard Grant
Measurements of the Ordered Phases of Solid Helium-3
固体 He-3 有序相的测量
- 批准号:
7823974 - 财政年份:1979
- 资助金额:
$ 33万 - 项目类别:
Continuing Grant
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