中国科学院理论物理研究所机构知识库
Advanced  
ITP OpenIR  > 理论物理所1978-2010年知识产出  > 期刊论文
题名: U(1)xSU(2) Chern-Simons gauge theory of underdoped cuprate superconductors
作者: Marchetti, PA ;  Su, ZB ;  Yu, L
刊名: PHYSICAL REVIEW B
出版日期: 1998
卷号: 58, 期号:9, 页码:5808-5824
关键词: T-J MODEL ;  DIMENSIONAL HUBBARD-MODEL ;  QUANTUM-FIELD THEORY ;  NON-ABELIAN BOSONIZATION ;  VALENCE-BOND STATE ;  SPIN DYNAMICS ;  2 DIMENSIONS ;  ELECTRONIC-STRUCTURE ;  CRITICAL EXPONENTS ;  C SUPERCONDUCTORS
学科分类: Physics
通讯作者: Marchetti, PA , Univ Padua, Dipartimento Fis, INFN, I-35131 Padua, Italy.
部门归属: Univ Padua, Dipartimento Fis, INFN, I-35131 Padua, Italy; Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China; Int Ctr Theoret Phys, I-34100 Trieste, Italy
英文摘要: The Chern-Simons bosonization with U(1)xSU(2) gauge field is applied to the two-dimensional t-J model in the limit t much greater than J, to study the normal-state properties of underdoped cuprate superconductors. We prove the existence of an upper bound on the partition function for holons in a spinon background and we find the optimal spinon configuration saturating the upper bound on average-a coexisting flux phase and s+id-like resonating-valence-bond state. After neglecting the feedback of holon fluctuations on the U(1) field B and spinon fluctuations on the SU(2) field V, the holon field is a fermion and the spinon field is a hard-core boson. Within this approximation we show that the B field produces a rr flux phase for the holons, converting them into Dirac-like fermions, while the V field, taking into account the feedback of holons produces a gap for the spinons vanishing in the zero-doping limit. The nonlinear-a model with a mass term describes the crossover from the short-ranged antiferromagnetic (AF) state in doped samples to long-range AF order in reference compounds. Moreover, we derive a low-energy effective action in terms of spinons, holons and a self-generated U(1) gauge field. Neglecting the gauge fluctuations, the holons are described by the Fermi-liquid theory with a Fermi surface consisting of four "half-pockets" centered at (+/-pi/2,+/-pi/2) and one reproduces the results for the electron spectral function obtained in the mean-field approximation, in agreement with the photoemission data on underdoped cuprates: The gauge fluctuations are not confining due to coupling to holons, but nevertheless yield an attractive interaction between spinons and holons leading to a bound state with electron quantum numbers. The renormalization effects due to gauge fluctuations give rise to non-Fermi-liquid behavior for the composite electron, in certain temperature range showing the linear in T resistivity. This formalism provides a new interpretation of the spin gap in the underdoped superconductors (mainly due to the short-ranged AF order) and predicts that the minimal gap for the physical electron is proportional to the square root of the doping concentration. Therefore the gap does not vanish in any direction. All these predictions can be checked explicitly in experiment.
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:000075720100095
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/12271
Appears in Collections:理论物理所1978-2010年知识产出_期刊论文

Files in This Item: Download All
File Name/ File Size Content Type Version Access License
U(1)×SU(2) Chern-Simons gauge theory of underdoped cuprate superconductors.pdf(242KB)----开放获取View Download

Recommended Citation:
Marchetti, PA,Su, ZB,Yu, L. U(1)xSU(2) Chern-Simons gauge theory of underdoped cuprate superconductors[J]. PHYSICAL REVIEW B,1998,58(9):5808-5824.
Service
 Recommend this item
 Sava as my favorate item
 Show this item's statistics
 Export Endnote File
Google Scholar
 Similar articles in Google Scholar
 [Marchetti, PA]'s Articles
 [Su, ZB]'s Articles
 [Yu, L]'s Articles
CSDL cross search
 Similar articles in CSDL Cross Search
 [Marchetti, PA]‘s Articles
 [Su, ZB]‘s Articles
 [Yu, L]‘s Articles
Related Copyright Policies
Null
Social Bookmarking
  Add to CiteULike  Add to Connotea  Add to Del.icio.us  Add to Digg  Add to Reddit 
文件名: U(1)×SU(2) Chern-Simons gauge theory of underdoped cuprate superconductors.pdf
格式: Adobe PDF
此文件暂不支持浏览
所有评论 (0)
暂无评论
 
评注功能仅针对注册用户开放,请您登录
您对该条目有什么异议,请填写以下表单,管理员会尽快联系您。
内 容:
Email:  *
单位:
验证码:   刷新
您在IR的使用过程中有什么好的想法或者建议可以反馈给我们。
标 题:
 *
内 容:
Email:  *
验证码:   刷新

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.

 

 

Valid XHTML 1.0!
Copyright © 2007-2017  中国科学院理论物理研究所 - Feedback
Powered by CSpace