约翰霍普金斯大学物理学科研项目

约翰霍普金斯大学物理学科研项目

JHU Physics Research

项目起源

在最新的世界学术水平排行榜中，绝大部分都是美国的大学。由于美国大学与工商业、企业结合紧密，同时学校的教学资源、实验课题及实验设备都属于全球顶尖状态，从而成为众多留学生的梦想留学目的地。

目前中国学生申请赴美留学人数日益剧增，以往美国顶尖名校选择录取GPA高分学生，后来校方逐渐发现学生在学习中缺少创新和实操的能力，进而导致美国名校录取率的下降。近些年，招生官对选择学生时更加看重的是自主创新、专业技能、思维创造才能等综合素质人才。对于计划入读美国名校的学生，实际的科研经验无疑可以提升竞争力，从而大大增加被名校录取的概率。

科研时间

6月1日--9月1日，每期时间长度为3—4周；

（针对假期只有3周的学生，可选3周实地+1周远程，确保科研收获）

科研主题

约翰霍普金斯大学物理学科研

面向对象

以欲申请美国名校物理学、理论物理、量子物理、凝聚态等相关专业的本科生、研究生为主；

科研简介

Condensed matter is a branch of physics involving a wide range of fundamental exploration and has been acting as an important driving force for state-of-the-art technologies. Solids, liquids, and other condensed states of matter with a typical particle number density of 〜1023/cm3 and the dominating interaction as electromagnetic, are all subjects of study with the aid of combinations of various experimental and theoretical (analytic or simulation) techniques. Among the experimental methods there is one category where electromagnetic waves are employed to probe the properties of solid states of matter. With the appropriate frequency of ’’light’’，the physics of electrons in different systems can be characterized or unveiled. There have been developed tremendously many photon spectroscopies whose frequency scales range from X-ray to DC, such as X-ray fluorescence, photoemission，Raman, UV-visible, Fourier transform infrared reflectivity, THz transimission, mi¬crowave cavity, just for a very incomplete list. In this research project, our attention is particularly focused on a broadband Corbino microwave reflective spectroscopy (BCMS) working in the low GHz range (50 MHz — 20 GHz, 1 GHz 〜4.14 meV) which coincides with the typical fermionic gaps of superconductors (optimally doped cuprates, for instance,〜50 meV). Therefore, the BCMS tech¬nique is especially useful for the investigation of superconductivity and besides, some of the strongly corrleated electron systems.

Superconductity as a macroscopic quantum phenomena arises because of the formation of fermion pairs (called Cooper pairs) typically mediated by arbitrarily small attractive interactions. The paradigm of Bardeen-Cooper-Schrieffer (BCS) theory has broad applicability but could not fully account for, for example, the properties of disordered superconductors and unconventional super¬conductors. In the past three decades there has been a continuing theoretical controversy on the origin of exotic superconducvitiy, the pseudogap, and the machanisms of superconductor-insulator or superconductor-metal transitions in the presence of disorder and/or magnetic field. More experimental work is still awaited for these problems and especially, the low energy AC conductivity measurements. In this summer research project, the suggested goals are as follows:

•Understanding the preliminary physics of conventional superconductity

•Understanding the physical principles of microwave reflectivity measurement

•Learning the basic skills for vacuum technology and cryogenics

•Obtaining some practice with data acquisition through Labview and data analysis using Igor Pro software.

•Measuring the microwave conductivity of a disordered superconductor

科研亮点

1. 进入美国名校实验室/科研组，接触尖端科学

为未来赴美深造做准备；科研经历是美国名校申请的基石，顶级名校的科研项目是对学生有能力完成名校学业最好的证明。

2. 师从导师开展实验项目

高层次的人脉和校友关系，与学生为伍的人是诺贝尔奖获得者、美国科学院院士、教授、名校博士、硕士，学生将体验到世界最顶级学术专家们的思想和气质。

3. 获得导师推荐信和科研证书

对于优秀学生可以获得名校导师的推荐信，大大助力未来的留学申请。

4. 全天候专业英语环境，迅速提升专业水平

提升沟通和专业英语水平，提升专业知识和能力，用实践使学生的理论知识更加具体形象。

5. 高含金量收获助力未来留学深造及就业

在名校导师指导下的科研过程将帮助学生明确自身发展方向，不断深化对于美国学界的了解与认同，帮助参与学生及家长明确未来的学校及专业申请方向；从而更好的明确留学的目的与意义，摆脱盲目，获得真知。

科研收获

1.科研完成时，学生将会全面了解物理学领域基本知识和最新进展，并获得导师推荐信和丰富的CV履历。

2.挑战自身潜能，切身体会宾夕法尼亚大学顶尖科研环境，在严苛的训练下快速成长。

3.极大拓宽视野，实地感受国内外科研区别。通过此次科研，参与学生将会对留学名校有个清晰的认识，并依此做出最优的人生规划。

4.学生将有机会与顶尖教授零距离交流套磁，了解宾夕法尼亚大学的内部申请信息。

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