Localized states in the Mott insulator<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>κ</mml:mi></mml:math>-(BEDT–TTF)<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>2</mml:mn></mml:msub></mml:math>Cu[N(CN)<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>2</mml:mn></mml:msub></mml:math>]Cl as probed by photoluminescence

Drichko, Natalia; Hackl, R.; Schlueter, J. A.

doi:10.1103/physrevb.88.115109

Cited by 5 publications

(3 citation statements)

References 44 publications

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“…• Recently, in photoluminescence spectra of a two-dimensional organic Mott insulator the creation of an exciton was suggested [57]. The theory of photo-induced transitions [58] proposes that higher excited states can be populated and excitons brake up; Frenkel excitons becomes charge-transfer excitons and propagate.…”

Section: Discussionmentioning

confidence: 99%

Light-Induced Current Oscillations in the Charge-Ordered State of (TMTTF)2SbF6

Peterseim¹,

Dressel²

2017

Preprint

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Below T CO = 157 K the quasi-one-dimensional charge-transfer salt (TMTTF) 2 SbF 6 undergoes a pronounced phase transition to a charge-ordered ground state. We have explored the non-linear and photoconductive behavior as a function of applied voltage, laser pulse energy and temperature. Besides a decay of the photoconductive signal in a double exponential fashion in the millisecond range, we discover current oscillations in the kHz range induced by the application of short laser pulses. While the resonance frequencies do not depend on voltage or laser intensity and vary only slightly with temperature, the amplitude changes linearly with the laser intensity and voltage. The findings are discussed and compared to comparable phenomena in other low-dimensional electron systems.

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Section: Discussionmentioning

confidence: 99%

Light-Induced Current Oscillations in the Charge-Ordered State of (TMTTF)2SbF6

Peterseim¹,

Dressel²

2017

Preprint

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“…The cooling rates were in the range from 0.2 K/min to 1 K/min so as to avoid a mixed state of metallic and insulating domains in κ-ET-Br 25,26 . The absence of luminescence at 3500 cm −1 proved that κ-ET-Br is in a homogeneous metallic state 27 .…”

Section: Introductionmentioning

confidence: 99%

Antiferromagnetic fluctuations in a quasi-two-dimensional organic superconductor detected by Raman spectroscopy

2015

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Using Raman scattering, the quasi-two dimensional organic superconductor -(BEDT-TTF)2-Cu[N(CN)2]Br (Tc = 11.8 K) and the related antiferromagnet -(BEDT-TTF)2Cu[N(CN)2]Cl are studied. Raman scattering provides unique spectroscopic information about magnetic degrees of freedom that has been otherwise unavailable on such organic conductors. Below T = 200 K a broad band at about 500 cm 1 develops in both compounds. We identify this band with two-magnon excitation. The position and the temperature dependence of the spectral weight are similar in the antiferromagnet and in the metallic Fermi-liquid. We conclude that antiferromagnetic correlations are similarly present in the magnetic insulator and the Fermi-liquid state of the superconductor.

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“…• Recently, in photo-luminescence spectra of a two-dimensional organic Mott insulator the creation of an exciton was suggested [71]. The theory of photo-induced transitions [72] proposes that higher excited states can be populated and excitons brake up; Frenkel excitons becomes charge-transfer excitons and propagate.…”

Section: Discussionmentioning

confidence: 99%

Light-Induced Current Oscillations in the Charge-Ordered State of (TMTTF)2SbF6

Peterseim

Dressel

2017

Crystals

View full text Add to dashboard Cite

Below T CO = 157 K the quasi-one-dimensional charge-transfer salt (TMTTF) 2 SbF 6 undergoes a pronounced phase transition to a charge-ordered ground state. We have explored the non-linear and photoconductive behavior as a function of applied voltage, laser pulse energy and temperature. Besides a decay of the photoconductive signal in a double exponential fashion in the millisecond range, we discover current oscillations in the kHz range induced by the application of short laser pulses. While the resonance frequencies do not depend on voltage or laser intensity and vary only slightly with temperature, the amplitude changes linearly with the laser intensity and voltage. We suggest that photo-induced fluctuations of the charge-ordered state alter the current flow of the single particles and hence, the photocurrent. The findings are discussed and compared to comparable phenomena in other low-dimensional electron systems.

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Localized states in the Mott insulatorκ-(BEDT–TTF)2Cu[N(CN)2]Cl as probed by photoluminescence

Abstract: We compare the photoluminescence spectra of the low-temperature Mott insulator κ-(BEDT- TTF

Cited by 5 publications

References 44 publications

Light-Induced Current Oscillations in the Charge-Ordered State of (TMTTF)2SbF6

Light-Induced Current Oscillations in the Charge-Ordered State of (TMTTF)2SbF6

Antiferromagnetic fluctuations in a quasi-two-dimensional organic superconductor detected by Raman spectroscopy

Light-Induced Current Oscillations in the Charge-Ordered State of (TMTTF)2SbF6

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