E*******1 发帖数: 3464 | 1 背景是,美国fresh PHD in physics/materials, 做固体材料里phonon dynamics,
electron-phonon interaction,和其导致的thermal transport和phase
transformation性质。实验和计算各一半, 估计属于小community。实验主要是高温高
压Raman, infrared, neutron scattering等, 自己搭建的变温raman spectrometer,
所以对光学实验非常熟;计算主要是first principles molecular dynamics
simulation算法研究。 文章,有3,4篇一作通讯作者PRB, 1篇一作PRL,只审过几次PR
的文章和一次solid state comm.,无其他,虽然通过骚扰编辑有几个杂志被editor加
在通讯名录里暂没接到任何活。不知道为啥凝聚态这么多杂志这么多manuscript,也没
人找我做个审稿的,唉。。。
在此真诚跪求审稿机会,站内联系。本人有伪币400,是不是就是传说中的包子? 如果
是,我意慷慨解囊,20个包... 阅读全帖 |
|
z******g 发帖数: 4 | 2 A postdoc position is available at the University of Arizona. The postdoc
will work on phonon and electron Monte Carlo simulations of three-
dimensional GaN-on-SiC devices. The applicant should be familiar with
electron and phonon modeling and parallel computing with Fortran programs,
with good writing and communication skills. The applicant should have a PhD
degree in relevant fields (e.g., materials science, physics, mechanical
engineering, and electrical engineering). Experience with first-pr... 阅读全帖 |
|
a*****e 发帖数: 4577 | 3 phonon的dispersion在zone center一般都有LO-TO splitting
我可以理解你说的q->0的情况
但是如果这样,在q=0处, LO phonon的dispersion是不连续的? |
|
h***o 发帖数: 38 | 4 on the band structures of elastic waves in 2D and 3D phononic crystals (PCs)
请附简要背景介绍. 谢谢 |
|
d*******n 发帖数: 1566 | 5 有没有人读过这篇paper!
http://prb.aps.org/abstract/PRB/v58/i19/p12899_1
Phys. Rev. B 58, 12899–12907 (1998)
Phonon dispersion and Raman scattering in hexagonal GaN and AlN
Abstract
References
Citing Articles (122)
Download: PDF (182 kB) Buy this article Export: BibTeX or EndNote (RIS)
V. Yu. Davydov*, Yu. E. Kitaev, I. N. Goncharuk, and A. N. Smirnov
Ioffe Physical Technical Institute, St. Petersburg 194021, Russia
J. Graul, O. Semchinova, and D. Uffmann
LFI Universitat Hannover, Schneiderberg 32, 30167 |
|
d*******n 发帖数: 1566 | 6 有没有人读过这篇paper,
期末考试是要将这一篇paper,无耐不是我的背景,
应该是比较经典的文章,如果有人熟悉可以帮忙一下感谢万分!
谢谢
(站内信)
http://prb.aps.org/abstract/PRB/v58/i19/p12899_1
Phys. Rev. B 58, 12899–12907 (1998)
Phonon dispersion and Raman scattering in hexagonal GaN and AlN
Abstract
References
Citing Articles (122)
Download: PDF (182 kB) Buy this article Export: BibTeX or EndNote (RIS)
V. Yu. Davydov*, Yu. E. Kitaev, I. N. Goncharuk, and A. N. Smirnov
Ioffe Physical Technical Institute, St. Petersburg 194021, Russia
J. Graul, O. Semchinova, |
|
p***e 发帖数: 402 | 7 The mean free time between two electron-phonon collisions ? |
|
w******0 发帖数: 20 | 8 最近看分子动力学计算 纳米材料传热的paper。很多提到 phonon scattering。 想学
习这方面的基础知识。看了几本固体物理的书,讲的太粗略。有没有相关书籍介绍比较
详细易懂的。谢谢。 |
|
x*z 发帖数: 1010 | 9 嘿嘿给你个idea
root@mee:~# apt-get install k9copy
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following extra packages will be installed:
docbook-xsl docbook-xsl-doc-html dvdauthor kdebase-runtime
kdebase-runtime-data kdelibs-bin kdelibs5-data kdelibs5-plugins kdoctools
kubuntu-debug-installer libattica0 libboost-filesystem1.42.0
libboost-regex1.42.0 libboost-system1.42.0 libclucene0ldbl libdbusmenu-qt2
libiodbc2 libkatepartinterfaces4 ... 阅读全帖 |
|
f***h 发帖数: 55 | 10 【 以下文字转载自 Physics 讨论区 】
发信人: fifth (小护士), 信区: Physics
标 题: One more paper review chance
发信站: BBS 未名空间站 (Fri Mar 4 21:57:48 2011, 美东)
There is one more paper from Modern Physics Letters B. If you are familiar
with this field and interested in it, please let me know with your
information.
j****[email protected]
==========================
Title: PHONON-DRAG EFFECT OF NANO-SCALE FeSi2 FILMS AND THERMOELECTRIC
APPLICATION
Abstract: Phonon-drag effect usually occurs in single crystals at very low
temper... 阅读全帖 |
|
f***h 发帖数: 55 | 11 There is one more paper from Modern Physics Letters B. If you are familiar
with this field and interested in it, please let me know with your
information.
j****[email protected]
==========================
Title: PHONON-DRAG EFFECT OF NANO-SCALE FeSi2 FILMS AND THERMOELECTRIC
APPLICATION
Abstract: Phonon-drag effect usually occurs in single crystals at very low
temperatures (10 - 200 K). Strong phonon-drag effect is observed in nano-
scale FeSi2 films around room temperature. The Seebeck coefficient... 阅读全帖 |
|
w********o 发帖数: 10088 | 12 光的联系我明白,可是光子的能量怎么跟phonon能量联系起来的啊
从那个测出来的shift,可以推算出一个波长。这个波长是phonon的吧。算的时候,不能用光的速度吧?只知道波长,不知道频率,不是还是算不出来能量么
如果波长是phonon的,用德布罗意关系的话,可以从波长知道动量,但算能量,还得知道有效质量。这个phonon的质量一般怎么取呢? |
|
w*u 发帖数: 2 | 13 You need to know the e-p interaction constant in that sample so you can calc
ulate how the heat generated by Joule heating is dissipated in the phonon sy
stem and then through the phonon coupling to the heat sink.
Because the system seems big so e diffusion is not dominating in this case.
Also the temprature is high, 2K, phonon specific heat constant is still high
enough for phonon system to dissipate heat.
But the authour is not worry about overheating yet.
He is just worry about the accuracy o |
|
|
O***e 发帖数: 89 | 15 Thanks very much for up floorers and your discussions, here is my thoughts:
definition of viscosity as shear stress/velocity gradient is clear in liquid
and glass, but the internal friction is not that cleat to me. In soilds
like glass, some papers mention it as the ratio of acoustic phonon full
width of half maximum(FWHM) and acoustic phonon frequency(f, f is at GHz
level) IF=FWHM/f; in liquid, it should be the same definition and from the
unit, I think FWHM(inverse of the phonon lifetime) is ... 阅读全帖 |
|
a*****e 发帖数: 4577 | 16 我以为你说的是optical phonon和acoustic phonon
事实上IR 和 raman都是和optical phonon作用啊 |
|
a****a 发帖数: 5763 | 17 phonon 难道不是massless的?
还是有什么物理过程让phonon有质量了?
不能用光的速度吧?只知道波长,不知道频率,不是还是算不出来能量么
知道有效质量。这个phonon的质量一般怎么取呢? |
|
M*****c 发帖数: 3306 | 18 http://news.tongji.edu.cn/classid-8-newsid-36846-t-show.html
(文汇报今日头版头条)用“声子学”引领热技术突破
来源:《文汇报》 发表时间:10/17/2012 阅读次数:807
物理学各大领域中,热的研究进展很慢,几十年来几乎在原地踏步。李保文教授开
辟出一片新天地,正在同济大学主持一系列前沿研究—— 用“声子学”引领热技术突破
本报首席记者 张懿
如果想尽快烧开一壶冷水,你一定会把炉火调旺。但有一种材料,用它装水,火越
旺,水反而热得越慢,你相信吗?
这完全颠覆了常识,可根据新近的研究,至少在理论上,这种现象已被证明是可能
的。
做出这个理论证明的学者,是中央“千人计划”特聘专家李保文教授。眼下,他正
在同济大学主持一系列前沿研究——研发高度精密和智能的器件,用来控制热流。
今年7月,国际物理界最权威、影响因子最高的学术期刊《现代物理评论》(
Modern Physics Review)发表了李保文和同事们一篇关于“声子学”的论文,详细介
绍了他带领的团队10多年来在这个领域的主要研究成果。
找到能够制造“奇异水壶”的材... 阅读全帖 |
|
c**m 发帖数: 1632 | 19 Apparently it is a technique to measure the acoustic phonon modes of the HTc
materials. I don't know why the coherent excitation of the acoustic phonon
or vibrations could be called a uaser, the analogue of laser. For lasing,
there is spontaneous emission and it is fed into the stimulated emission
mode by light travelling in a resonant cavity. Within this traditional
scenario, the claim is not true. |
|
c**m 发帖数: 1632 | 20 Acoustic phonons close to the long wavelength limit. Rough estimation gives
2*pi*Vs/kB*T and that's why they talked about breather mode of the HTc
ceramics. From my perspective, not so much physics there. The mechanism of
HTc superconductivity is the "coulomb-repulsion induced electron coherent
state" though the exact model is not available. "Phonon assisted pairing
mechanism" works for low temperature superconductors and it could not
explain the phase transition in chemical stoichiometry. |
|
e**********n 发帖数: 359 | 21 Have you ever seen Hamiltonians containing pairs of creation and
annihilation operators such as c^\dagger_i c^\dagger_j ?
Vacuum is nothing but a state annihilated by all the annihilation operators
under consideration. It is never really empty. For example, if a problem
only concerns electrons, all other particles, mu, tau, nu's are hidden in
the 'vacuum'. If you do not consider electron-phonon scattering in a
material, phonons are hidden in the vacuum of the electron Hamiltonian. This
is the ph... 阅读全帖 |
|
w********o 发帖数: 10088 | 22 老看见大家测raman谱,出来的peak都是用raman shift表示的,单位是1/cm
这个raman shift怎么和phonon energy联系起来呢?比如说我知道这个shift的value,
想算对应phonon energy该怎么算呢?
谢谢 |
|
h*l 发帖数: 19 | 23 Reply to a series message listed here before:
As an academic humor point of view:
MgB2 : Boy --- 美 --- Boy
BCS mech: electron -- phonon -- electron
(fermion) (boson) (fermion)
As we know, the phonon-electron scattering and
electron-elctron interaction cause the resitivity,
when they correlate together, scattering mainly
becomes internal which cause no TOTAL-monmentum
changing, (scattring between Cooper pair ect is
just higher order neglect |
|
x********i 发帖数: 905 | 24 Intel STS 2015 Finalists
Anandapadmanaban, Eswar
Dr. Ronald E. McNair Academic High School, Jersey City, NJ
The ThereNIM: A Touch-less Respiratory Monitor
Ashkin, Emily Lorin
Providence Day School, Charlotte, NC
A Novel Synergistic Approach for Enhancing Immunotherapy in the Treatment of
Melanoma
Chemparathy, Augustine George
Dougherty Valley High School, San Ramon, CA
Accumulation of the Biodiesel Precursor Triacylglycerol Offsets Oxidative
Stress in the Model Alga Chlamydomonas reinhardtii
Cui... 阅读全帖 |
|
Q*****Y 发帖数: 741 | 25 来源:观察者网
王孟源(哈佛大学物理学博士):“天使粒子”的吹嘘,我一看就摇头
我之前在《丁肇中与高能物理界的牛屎文化》里,解释了AMS-02实验的实际科学意义,
以及其负责人对大众媒体所做的虚伪吹嘘。当时丁教授宣称AMS-02的2014年度总结报告
“即将发现暗物质”,如今三年过去了,不但2014年没有任何暗物质的踪影,2015年和
2016年也一样是空空如也。如果读者有兴趣,可以再等半年,看看2017年度总结是否会
有暗物质出现。
我当时把高能物理界的牛屎(Bullshit)文化归罪于超弦族群。他们为了推进自己的职
业生涯,发明了毫无实际意义和内涵的超弦理论,以便藉其高达10^500的自由度来出版
无限多的论文,每一篇都与这个宇宙完全无关。追根究底,他们能这样集体欺世盗名,
靠的是过去40年高能物理实验困难度的指数性成长。所以其他难以做精确实验的科学,
也同样会有类似的问题。最严重和众所熟知的,是在医学(Medicine)和心理学(
Psychology)上。过去五年,有一系列圈内人出面批评这些学科的论文质量,揭发了近
年绝大多数(一般估计70%,但是有估计高达89%的)论文的结果... 阅读全帖 |
|
L*******g 发帖数: 913 | 26 有请物理将军们(弃婴大傻)来评评
http://www.guancha.cn/wangmengyuan/2017_07_24_419613.shtml
我之前在《丁肇中与高能物理界的牛屎文化》里,解释了AMS-02实验的实际科学意义,
以及其负责人对大众媒体所做的虚伪吹嘘。当时丁教授宣称AMS-02的2014年度总结报告
“即将发现暗物质”,如今三年过去了,不但2014年没有任何暗物质的踪影,2015年和
2016年也一样是空空如也。如果读者有兴趣,可以再等半年,看看2017年度总结是否会
有暗物质出现。
我当时把高能物理界的牛屎(Bullshit)文化归罪于超弦族群。他们为了推进自己的职
业生涯,发明了毫无实际意义和内涵的超弦理论,以便藉其高达10^500的自由度来出版
无限多的论文,每一篇都与这个宇宙完全无关。追根究底,他们能这样集体欺世盗名,
靠的是过去40年高能物理实验困难度的指数性成长。所以其他难以做精确实验的科学,
也同样会有类似的问题。最严重和众所熟知的,是在医学(Medicine)和心理学(
Psychology)上。过去五年,有一系列圈内人出面批评这些学科的论文质量,... 阅读全帖 |
|
x****6 发帖数: 4339 | 27 看题目,都是学术前沿的工作,屁挨着地水平的。
以马公和千老领域为主。
Picoscale Mechanics of Atomically Engineered Materials
Optical Control of Protein Assembly and Activity in Cell-Like-Compartments
Cell Membrane-Coated Nanodevice for Anti-Virulence Therapy Against
Antibiotic Resistant Bacteria
Artemisinin as a Potential Parkinson's Disease Treatment via Alleviation of
α-Synuclein Mediated Neuronal Damage and Inflammation
Exploring Posterior Growth in D. rerio Using a Live Cell Cycle Biosensor
Modeling the Spatio-Temporal Dynami... 阅读全帖 |
|
|
r**********n 发帖数: 136 | 29 Phonons,
Can you share where the dealer is that you got this price? Example of what
are these accessories?
Thanks a lot! |
|
|
s*****w 发帖数: 112 | 31 出售: ONE HP touchpad 32GB @ $260+YL from east
p*****[email protected] |
|
D**********s 发帖数: 3139 | 32 算了,今天耐心不太好,花时间研究了提议也没什么人捧场。
如果要去掉vibration,网上推荐和卖的那些damper都不太实际。因为既要考虑到管子
的散热,又要隔音。这在物理上是非常难做到的,声音和热在固体中都是phonon传播的
,热的传导涵盖了short to long wavelength。用简单设计做一个既隔音又导热的
filter不是很容易。那些正在卖的和网上说有用的硅胶和海绵之类的,基本都是玩闹,
要不让散热更差,要不根本就是transparent to vibration。很多的震动都是通过PCB和
管座传入的。
又是我的愚见,别认真。
can |
|
f*******n 发帖数: 27 | 33 We are inviting applications for funded PhD student positions at the School
of Mechanical Engineering, Purdue University. Applicants with Bachelor or
Master Degree in one of the following disciplines: physics and applied
physics, mechanical engineering, electrical engineering, and materials
science, and with interests in one of the following areas: optics, heat
transfer, NEMS/MEMS, metrology, photonics and phononics, and magnetics, are
strongly encouraged to apply. The position will start from S... 阅读全帖 |
|
|
y******u 发帖数: 141 | 35 物理的引用太少了。
三年了,才80不到。 不蛋定了,出邪招, 求引用。 嘿嘿嘿
关键词: Raman, CARS, EPR, TiO2, KTP, OPO, point defects, Non-linear optical
imaging,
同时,作为AIP, OSA, APS, SPIE, elsevier 的审稿人, 兼求审稿。
想年底把EB1-A 交出去,憋不住了。
14. “Ultrafast decay of high frequency optical phonon mode in KTiOPO4,”
Appl. Phys. Lett. 99, 221903 (2011).
13. “3D nonlinear microspectroscopy and imaging of soft condensed matter,
” Opt. Lett. 36, 3849 (2011).
12. “Power and tuning characteristics of a broadly tunable fs OPO based
on PPSLT” J. Opt. So... 阅读全帖 |
|
x****7 发帖数: 165 | 36 Journal: International Journal of Modern Physics B
Title: Thermal conductances attributed to phonon and electron in graphene
nanoribbon
485求祝福:
RD:10/21/2013
FP:11/20/2013
AP/EAD 还没有消息,LP急等EAD上班,太着急了。。。 |
|
|
l******9 发帖数: 84 | 38 Hi Hhaoo,
I have sent you the message. Please check. Thank you.
PCs) |
|
k***g 发帖数: 4904 | 39 关键词
resonant tunneling diode (RTD);phonon-assisted inelastic electron tunneling
spectroscopy (IETS)
知名全学科综合性杂志,If 5.x。请注意题目与关键词,确定您有足够背景审稿,如果
方向不match我不能邀请,感谢理解。
如果接受审稿邀请在按时完成的基础上保证审稿质量,请至少对以下--所有--方面有评
价:文章讨论的核心问题是什么,introduction是否让读者很快可以明白文章要讨论的
主题以及其来由,实验设计与结果讨论是否合理,以及是否遗漏重要文献。请注意审稿
时候不要太过苛刻,很多新审稿人常常很认真,但是提出问题的延伸性超出业内一般共
识,简单来说就是即使CNS的文章一样可以进一步提出尚未解释清楚的地方,继续做进
一步研究对吧,所以这个度请掌握好,尽量着眼在大处、全局,讨论核心问题是否严密
、自洽,当然细节的问题也请知无不言。报告以500-800字左右为宜。注意该杂志不让
审稿人基于文章讨论的主题是否具有影响力来判断是否被接收,而把这个留给读者判断
,请注意这个特点,谢谢。
... 阅读全帖 |
|
i***l 发帖数: 468 | 40 【 以下文字转载自 Military 讨论区 】
发信人: xiaoxiaoxi (小小溪), 信区: Military
标 题: Re: 全美英特尔科学奖决赛名单公布 13名华裔入围
发信站: BBS 未名空间站 (Sat Jan 24 16:00:54 2015, 美东)
Intel STS 2015 Finalists
Anandapadmanaban, Eswar
Dr. Ronald E. McNair Academic High School, Jersey City, NJ
The ThereNIM: A Touch-less Respiratory Monitor
Ashkin, Emily Lorin
Providence Day School, Charlotte, NC
A Novel Synergistic Approach for Enhancing Immunotherapy in the Treatment of
Melanoma
Chemparathy, Augustine George
Dougherty Valley High School, Sa... 阅读全帖 |
|
t***n 发帖数: 546 | 41
所谓阴阳平衡,指世界上一切事物中都具有的两种既互相对立又互相联系的力量,他们
形成一个动态的平衡。物理学上讲是一个steady state。如同在一个水槽里面一边加水
,一边放水,在steady state时候水槽水面不变。这个理论本身是没有什么问题的。具
体到实际问题,比如水面现在下降了,到底是放水太快还是加水太慢,就要看具体的模
型是不是能够找到问题所在了。
五行相生相克,具体来说就是这5个参数不是独立的,他们有着内在的联系。比如物理
上,介质的光学性能可以简单的用折射率=n+ik来表示。n代表折射,虚部k代表吸收。n
和k都可以通过实验来确定,但是它们却不是独立的,满足Kramers–Kronig relation
。 笼统来说就是它们是相生相克的。嘲笑相生相克就和嘲笑Kramers–Kronig
relation一样无知。中医可以提高的是把这种相生相克的关系尽量具体化,比如找出它
们的函数关系。这个问题的复杂度相当大,还有很长一条路要走。
引进虚的东西仅仅是为了方便理论的解释而已。你嘲笑虚的东西,就如同没学过复变函
数而嘲笑虚数的存在,没学过固体物理而嘲笑phonon的引入,... 阅读全帖 |
|
M*****c 发帖数: 3306 | 42 国际物理学顶尖杂志又有 “同济声音”。以国家“千人计划”特聘专家、同济大
学—新加坡国立大学“声子学与热能科学中心”主任、同济大学物理系教授李保文为通
讯作者,同济大学物理系研究员李念北为第一作者的一篇题为“Colloquium:
Phononics: Manipulating heat flow with electronic analogs and beyond”(《声
子学:基于声子的热调控和热信息处理等》)的论文,在国际公认物理学界最高水平评
论类刊物“Reviews of Modern Physics”(《现代物理评论》,季刊)2012年第三期
上发表。这也是该刊自1929年创刊以来迄今发表的第三篇以中国大陆学术单位为第一作
者单位的论文。
据介绍,“Reviews of Modern Physics” 不接受自由投稿,只能由杂志编辑邀
约撰稿,每年发表44篇文章。该杂志2010年影响因子为51.8。
《声子学:基于声子的热调控和热信息处理等》这篇文章描述的“声子学”是物
理学前沿的一个新兴领域,也就是用声子来进行热调控和热信息处理等。用来实现这... 阅读全帖 |
|
t******n 发帖数: 6242 | 43 photon != phonon
不过我是物理系毕业。上个月跟我师妹、现在声学所的领导聊了会,知道一点引进李教
授的内幕。还有数理化声海洋航空刚刚合并,成立了理学部。 |
|
a*****i 发帖数: 4391 | 44
Told you to try out KDE. With Phonon, the multimedia side of things are much
better than GNOME. |
|
s********n 发帖数: 235 | 45 标题: COMPARATIVE FTR-SPECTROSCOPIC AND RAMANSPECTROSCOPIC STUDIES OF
FUNDAMENTAL MODE FREQUENCIES IN LINBO2 AND PRESENT LIMIT OF OBLIQUE PHONON
DISPERSION ANALYSIS
作者: SCHULLER, E; CLAUS, R; FALGE, HJ, et al.
来源出版物: ZEITSCHRIFT FUR NATURFORSCHUNG SECTION A-A JOURNAL OF PHYSICAL
SCIENCES 卷: 32 期: 1 页: 47-53 出版年: 1977
many thanks!
x********[email protected] |
|
w*****h 发帖数: 231 | 46 D是来源于Diamond,我是第一次听说。不过,现在对于graphene的D,G 2D都已经搞得很
清楚了。
对graphene而言:
D峰不是对应的是sp3,而是碳环的breathing mode.就是环的大小变化.对应声子有有限
动量,因为动量守恒,所以在没有defect的情况下是不会出现的。2D is the overtone
of D. The momentum is conserved because two phonon with opposite momentum.
The scattering path is pretty clear now for D and 2D.
G is the zone center mode in which two sub-lattices vibrate relative to
each other. |
|
h***o 发帖数: 350 | 47 Solid State Communications
Volume 39, Issue 5, August 1981, Pages 625–629
The one phonon Raman spectrum in microcrystalline silicon
H. Richter,
Z.P. Wang+,
L. Ley
Thank you very much! |
|
y****e 发帖数: 2023 | 48 J Nanosci Nanotechnol. 2010 Jul;10(7):4596-601.
Spin-phonon coupling effects in antiferromagnetic Cr2O3 nanoparticles.
Hung CH, Shih PH, Wu FY, Li WH, Wu SY, Chan TS, Sheu HS.
Thanks with Baozi |
|