約翰霍普金斯大學(xué)物理學(xué)科研項目

以欲申請美國名校物理學(xué)、理論物理、量子物理、凝聚態(tài)等相關(guān)專業(yè)的本科生、研究生為主；

科研簡介

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

科研亮點

1. 進(jìn)入美國名校實驗室/科研組，接觸尖端科學(xué)

為未來赴美深造做準(zhǔn)備；科研經(jīng)歷是美國名校申請的基石，頂級名校的科研項目是對學(xué)生有能力完成名校學(xué)業(yè)最好的證明。

2. 師從導(dǎo)師開展實驗項目

高層次的人脈和校友關(guān)系，與學(xué)生為伍的人是諾貝爾獎獲得者、美國科學(xué)院院士、教授、名校博士、碩士，學(xué)生將體驗到世界最頂級學(xué)術(shù)專家們的思想和氣質(zhì)。

3. 獲得導(dǎo)師推薦信和科研證書

對于優(yōu)秀學(xué)生可以獲得名校導(dǎo)師的推薦信，大大助力未來的留學(xué)申請。

4. 全天候?qū)I(yè)英語環(huán)境，迅速提升專業(yè)水平

提升溝通和專業(yè)英語水平，提升專業(yè)知識和能力，用實踐使學(xué)生的理論知識更加具體形象。

5. 高含金量收獲助力未來留學(xué)深造及就業(yè)

在名校導(dǎo)師指導(dǎo)下的科研過程將幫助學(xué)生明確自身發(fā)展方向，不斷深化對于美國學(xué)界的了解與認(rèn)同，幫助參與學(xué)生及家長明確未來的學(xué)校及專業(yè)申請方向；從而更好的明確留學(xué)的目的與意義，擺脫盲目，獲得真知。

科研收獲

1.科研完成時，學(xué)生將會全面了解物理學(xué)領(lǐng)域基本知識和最新進(jìn)展，并獲得導(dǎo)師推薦信和豐富的CV履歷。

2.挑戰(zhàn)自身潛能，切身體會賓夕法尼亞大學(xué)頂尖科研環(huán)境，在嚴(yán)苛的訓(xùn)練下快速成長。

3.極大拓寬視野，實地感受國內(nèi)外科研區(qū)別。通過此次科研，參與學(xué)生將會對留學(xué)名校有個清晰的認(rèn)識，并依此做出最優(yōu)的人生規(guī)劃。

4.學(xué)生將有機(jī)會與頂尖教授零距離交流套磁，了解賓夕法尼亞大學(xué)的內(nèi)部申請信息。

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