Electronic density of states of a U(1) quantum spin liquid with spinon Fermi surface. I. Orbital magnetic field effects

doi:10.1103/PhysRevB.107.195155

	Electronic density of states of a U(1) quantum spin liquid with spinon Fermi surface. I. Orbital magnetic field effects
	He, Wen-Yu1 ; Lee, Patrick A.2
	2023-05-15
发表期刊	PHYSICAL REVIEW B (IF:3.2[JCR-2023],3.3[5-Year])
ISSN	2469-9950
EISSN	2469-9969
卷号	107 期号:19
发表状态	已发表
DOI	10.1103/PhysRevB.107.195155
摘要	A quantum spin liquid with a spinon Fermi surface is an exotic insulator that hosts neutral Fermi surfaces inside the insulating gap. In an external magnetic field, it has been pointed out that the neutral Fermi surfaces are Landau quantized to form Landau levels due to the coupling to the induced emergent gauge magnetic field. In this paper, we calculate the electronic density of states (as observed in tunneling experiments) of the quantum spin liquid in an orbital magnetic field. We find that the Landau levels from the neutral Fermi surfaces give rise to a set of steps emerging at the upper and lower Hubbard band edges. Each of the Hubbard band edge steps further develop into a band edge resonance peak when a weak gauge binding arising from the gauge field fluctuations is taken into account. Importantly, each Hubbard band edge step and its resulting resonance peak in the weak gauge binding are found to have a corresponding Landau level from the neutral Fermi surfaces, so the Hubbard band edge steps and the band edge resonance peaks provide signatures to the unique feature that characterizes the Landau quantization of the in-gap neutral Fermi surfaces in the spin liquid. We further consider the strong gauge-binding regime where the band edge resonance peaks move into the Mott gap and develop into true in-gap bound states. In the strong gauge binding regime, we solve the Landau-level spectrum of the in-gap bound states in an orbital magnetic field. For the in-gap bound state with a Mexican-hat-like band dispersion, we find that the envelop energy to have a state excited from the bound state Landau levels decreases quadratically with the magnetic field. The quadratic decrease behavior of the envelop energy is consistent with the intuition that applying magnetic field localizes the states and energetically promotes the in-gap bound states formation. Finally, we discuss the connection of our results to the electronic density of states spectra measured in the layered 1T-TaS2. We point out that a quantum spin liquid with a quasibound state in the upper Hubbard band can give the density of states spectra similar to the one measured in the experiment. © 2023 American Physical Society.
关键词	Binding energy Excited states Magnetic field effects Quantum theory Band-edge resonance Bands edges Bound-states Hubbard band Landau levels Magnetic-field Orbitals Quantum spin liquid Resonance peak Spectra's
URL	查看原文
收录类别	EI ; SCI
语种	英语
资助项目	DOE office of Basic Sciences[DE-FG02-03ER46076]
WOS研究方向	Materials Science ; Physics
WOS类目	Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter
WOS记录号	WOS:001008177200004
出版者	American Physical Society
EI入藏号	20232314204048
EI主题词	Gages
EI分类号	701.2 Magnetism: Basic Concepts and Phenomena ; 801.4 Physical Chemistry ; 931.3 Atomic and Molecular Physics ; 931.4 Quantum Theory ; Quantum Mechanics ; 943.3 Special Purpose Instruments
原始文献类型	Journal article (JA)
引用统计	正在获取...
文献类型	期刊论文
条目标识符	https://kms.shanghaitech.edu.cn/handle/2MSLDSTB/312339
专题	物质科学与技术学院物质科学与技术学院_PI研究组_贺文宇
通讯作者	He, Wen-Yu
作者单位	1.ShanghaiTech Univ, Sch Phys Sci & Technol, Shanghai 201210, Peoples R China 2.MIT, Dept Phys, Cambridge, MA 02139 USA
第一作者单位	物质科学与技术学院
通讯作者单位	物质科学与技术学院
第一作者的第一单位	物质科学与技术学院
推荐引用方式 GB/T 7714	He, Wen-Yu,Lee, Patrick A.. Electronic density of states of a U(1) quantum spin liquid with spinon Fermi surface. I. Orbital magnetic field effects[J]. PHYSICAL REVIEW B,2023,107(19).
APA	He, Wen-Yu,&Lee, Patrick A..(2023).Electronic density of states of a U(1) quantum spin liquid with spinon Fermi surface. I. Orbital magnetic field effects.PHYSICAL REVIEW B,107(19).
MLA	He, Wen-Yu,et al."Electronic density of states of a U(1) quantum spin liquid with spinon Fermi surface. I. Orbital magnetic field effects".PHYSICAL REVIEW B 107.19(2023).