Ghost excitonic insulator transition in layered graphite.
نویسنده
چکیده
Some unusual properties of layered graphite, including a linear energy dependence of the quasiparticle damping and weak ferromagnetism at low doping, are explained as a result of the proximity of a single graphene sheet to the excitonic insulator phase which can be further stabilized in a doped system of many layers stacked in the staggered ( ABAB...) configuration.
منابع مشابه
Magnetic-Field-Driven Superconductor-Insulator-Type Transition in Graphite
A magnetic-field-driven transition from metallicto semiconducting-type behavior in the basal-plane resistance takes place in highly oriented pyrolytic graphite at a field Hc ∼ 1 kOe applied along the hexagonal c-axis. The analysis of the data reveals a striking similarity between this transition and that measured in thinfilm superconductors and Si MOSFET’s. However, in contrast to those materia...
متن کاملCharge Friedel oscillations in a Mott insulator
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. When a metal undergoes a transition to an insulator it will lose its electronic Fermi surface. Interestingly, in so...
متن کاملZero-gap semiconductor to excitonic insulator transition in Ta2NiSe5
The excitonic insulator is a long conjectured correlated electron phase of narrow-gap semiconductors and semimetals, driven by weakly screened electron-hole interactions. Having been proposed more than 50 years ago, conclusive experimental evidence for its existence remains elusive. Ta2NiSe5 is a narrow-gap semiconductor with a small one-electron bandgap EG of <50 meV. Below TC=326 K, a putativ...
متن کاملEvidence for an excitonic insulator phase in 1T-TiSe2.
We present a new high-resolution angle-resolved photoemission study of 1T-TiSe2 in both its room-temperature, normal phase and its low-temperature, charge-density wave phase. At low temperature the photoemission spectra are strongly modified, with large band renormalizations at high-symmetry points of the Brillouin zone and a very large transfer of spectral weight to backfolded bands. A calcula...
متن کاملUltrafast Electronic Band Gap Control in an Excitonic Insulator.
We report on the nonequilibrium dynamics of the electronic structure of the layered semiconductor Ta_{2}NiSe_{5} investigated by time- and angle-resolved photoelectron spectroscopy. We show that below the critical excitation density of F_{C}=0.2 mJ cm^{-2}, the band gap narrows transiently, while it is enhanced above F_{C}. Hartree-Fock calculations reveal that this effect can be explained by ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Physical review letters
دوره 87 24 شماره
صفحات -
تاریخ انتشار 2001