Clocking the melting transition of charge and lattice order in 1T-TaS2 with ultrafast extreme-ultraviolet angle-resolved photoemission spectroscopy.

نویسندگان

  • J C Petersen
  • S Kaiser
  • N Dean
  • A Simoncig
  • H Y Liu
  • A L Cavalieri
  • C Cacho
  • I C E Turcu
  • E Springate
  • F Frassetto
  • L Poletto
  • S S Dhesi
  • H Berger
  • A Cavalleri
چکیده

We use time- and angle-resolved photoemission spectroscopy with sub-30-fs extreme-ultraviolet pulses to map the time- and momentum-dependent electronic structure of photoexcited 1T-TaS(2). This compound is a two-dimensional Mott insulator with charge-density wave ordering. Charge order, evidenced by splitting between occupied subbands at the Brillouin zone boundary, melts well before the lattice responds. This challenges the view of a charge-density wave caused by electron-phonon coupling and Fermi-surface nesting alone, and suggests that electronic correlations play a key role in driving charge order.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Ultrafast melting of a charge-density wave in the Mott insulator 1T-TaS2.

Femtosecond time-resolved core-level photoemission spectroscopy with a free-electron laser is used to measure the atomic-site specific charge-order dynamics of the charge-density wave in the Mott insulator 1T-TaS2. After strong photoexcitation, a prompt loss of charge order and subsequent fast equilibration dynamics of the electron-lattice system are observed. On the time scale of electron-phon...

متن کامل

arge density waves in 1T-TaS2: an angle-resolved photoemission study

The transition metal dichalcogenide 1T-TaS2 is a layered material exhibiting charge density waves. Based on angleresolved photoemission experiments mapping spectral weight at the Fermi surface and density functional theory calculations we discuss possible mechanisms involved with the creation of charge density waves. At first the flat parts of the elliptically shaped Fermi surface appear to pla...

متن کامل

Time-domain classification of charge-density-wave insulators.

Distinguishing insulators by the dominant type of interaction is a central problem in condensed matter physics. Basic models include the Bloch-Wilson and the Peierls insulator due to electron-lattice interactions, the Mott and the excitonic insulator caused by electron-electron interactions, and the Anderson insulator arising from electron-impurity interactions. In real materials, however, all ...

متن کامل

Fine structure in high-resolution photoemission spectra of quasi-two-dimensional 1T-TaS2

Using high-resolution angle-resolved photoemission spectroscopy ~ARPES!, we examined the charge density wave ~CDW! compound 1T-TaS2 as a function of the photon energy ~energy range from 11 up to 33 eV! for both quasicommensurate ~QC! and commensurate ~C! CDW phases. While the QC-phase normal emission ARPES spectra coincide with previous results, normal emission spectra of the C phase reveal evi...

متن کامل

Structural Dynamics in the Charge Density Wave Compound 1T-TaS2

This Diploma thesis is centered around the study of the structural dynamics in charge density wave (CDW) compounds. Owing to their quasi low dimensionality, CDWs present an ideal model system to investigate the delicate interplay between various degrees of freedom like spins, electrons, lattice, etc., common to macroscopic quantum phenomena such as high-temperature-superconductivity and colossa...

متن کامل

ذخیره 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 نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:
  • Physical review letters

دوره 107 17  شماره 

صفحات  -

تاریخ انتشار 2011