Manipulation of electronic structure via alteration of local orbital environment in 
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Kim, So Yeun; Kim, Choong Hyun; Sandilands, Luke J.; Sohn, Chae Hoon; Matsuno, Jobu; Takagi, H.; Kim, Kyung Wan; Lee, Yunsang; Moon, Seok‐Jun; Noh, T. W.

doi:10.1103/physrevb.94.245113

Cited by 34 publications

(33 citation statements)

References 51 publications

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“…The electric and magnetic ground states of the superlattices (SLs) [(SrIrO 3 ) n , (SrTiO 3 ) 1 ] (n = 1, 2, 3, 4, and ∞) indeed exhibit an antiferromagnetic (AFM) insulator-toparamagnetic metal crossover in analogy with the Sr n+1 Ir n O 3n+1 counterparts. Nevertheless, upon a closer examination, significant differences between the two series can be readily seen in their transition temperatures, magnetic structure, transport properties, optical conductivity, and their dimensional evolution [34,37,38]. These differences indicate that the details of the blocking layer may play a critical role in the physical properties of the confined 2D SIO layers.…”

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confidence: 99%

“…This could allow the thermally activated carriers and their transport to be more easily subject to lower-energy magnetic excitations and reflected in the resistivity kinks upon long-range ordering. Since the reduced gap was attributed to additional effective Ir-Ir hopping across the thin STO blocking layer [38], one can expect that, when m > 1, the interlayer tunneling will be suppressed, reinforcing the effective electron-electron correlation. This picture is indeed consistent with the enhanced insulating behavior in the 1/2-and 1/3-SLs compared to the 1/1-SL as seen from their larger logarithmic derivatives at high temperature well above the transitions ( Fig.…”

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confidence: 99%

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Two-Dimensional Jeff=1/2 Antiferromagnetic Insulator Unraveled from Interlayer Exchange Coupling in Artificial Perovskite Iridate Superlattices

et al. 2017

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We report an experimental investigation of the two-dimensional J eff = 1/2 antiferromagnetic Mott insulator by varying the interlayer exchange coupling in [(SrIrO3)1, (SrTiO3)m] (m = 1, 2 and 3) superlattices. Although all samples exhibited an insulating ground state with long-range magnetic order, temperature-dependent resistivity measurements showed a stronger insulating behavior in the m = 2 and m = 3 samples than the m = 1 sample which displayed a clear kink at the magnetic transition. This difference indicates that the blocking effect of the excessive SrTiO3 layer enhances the effective electron-electron correlation and strengthens the Mott phase. The significant reduction of the Neel temperature from 150 K for m = 1 to 40 K for m = 2 demonstrates that the long-range order stability in the former is boosted by a substantial interlayer exchange coupling. Resonant x-ray magnetic scattering revealed that the interlayer exchange coupling has a switchable sign, depending on the SrTiO3 layer number m, for maintaining canting-induced weak ferromagnetism. The nearly unaltered transition temperature between the m = 2 and the m = 3 demonstrated that we have realized a two-dimensional antiferromagnet at finite temperatures with diminishing interlayer exchange coupling.

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confidence: 99%

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Two-Dimensional Jeff=1/2 Antiferromagnetic Insulator Unraveled from Interlayer Exchange Coupling in Artificial Perovskite Iridate Superlattices

et al. 2017

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“…E.g., experiments on K 3 C 60 performed at temperatures below T c show a photoinduced suppression of superconductivity [118] instead of the expected gap enhancement. Apart from the proposed exciton-cooling model [132] this observation seems at odds with majority of the proposed scenarios [118,130,[138][139][140]. Secondly, the excitation densities in most of these experiments are extremely high.…”

Section: Photo-induced Superconductivity In Unconventional Supercondumentioning

confidence: 96%

Non-equilibrium Phenomena in Superconductors Probed by Femtosecond Time-Domain Spectroscopy

Demšar

2020

J Low Temp Phys

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Development of ultrafast lasers and non-linear optical techniques over the last two decades provides tools to access real-time dynamics of low energy excitations in superconductors. For example, time-resolved THz spectroscopy and time-and angular-resolved photoemission spectroscopy provide access to the real-time dynamics of the superconducting gap amplitude. Such studies enable determination of microscopic parameters like quasi-particle recombination rates, pair-breaking rates and electron-boson coupling constants. Recently, intense THz pulses have been used to probe the non-linear dynamics, including observation of collective modes. Moreover, using low frequency electromagnetic pulses, there are several reports of amplification of superconductivity in both conventional and unconventional superconductors. Starting with a brief historical overview of the pioneering work, where non-equilibrium phenomena in superconductors were investigated using quasi-continuous excitation, we review some of the insights that are provided by using real-time approaches. We focus on conventional BCS superconductors, whose ground state is reasonably well understood, and address similarities and open questions related to the corresponding studies in high-T c superconductors. arXiv:2003.11503v1 [cond-mat.supr-con]

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“…7(b)]. A first-principles study of the A 3 C 60 family further reveals that photoinduced deformation of the T 1u phonon mode can cause an interaction imbalance 168 (Ref. 170), it was expected that pumped correlated materials could display a rich variety of phases resulting from a change in the balance between dominant and subleading instabilities.…”

Section: Controlling Orders and Metastable Statesmentioning

confidence: 99%

Theoretical understanding of photon spectroscopies in correlated materials in and out of equilibrium

et al. 2018

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Photon-based spectroscopies have had a significant impact on both fundamental science and applications by providing an efficient approach to investigate the microscopic physics of materials. Together with the development of synchrotron X-ray techniques, theoretical understanding of the spectroscopies themselves and the underlying physics that they reveal has progressed through advances in numerical methods and scientific computing. In this Review , we provide an overview of theories for angle-resolved photoemission spectroscopy and resonant inelastic X-ray scattering applied to quantum materials. First, we discuss methods for studying equilibrium spectroscopies, including first-principles approaches, numerical many-body methods and a few analytical advances. Second, we assess the recent development of ultrafast techniques for outof-equilibrium spectroscopies, from characterizing equilibrium properties to generating transient or metastable states, mainly from a theoretical point of view. Finally , we identify the main challenges and provide an outlook for the future direction of the field. arXiv:1809.01617v1 [cond-mat.str-el]

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Manipulation of electronic structure via alteration of local orbital environment in [(SrIrO3)m,(SrTiO3<

Cited by 34 publications

References 51 publications

Two-Dimensional Jeff=1/2 Antiferromagnetic Insulator Unraveled from Interlayer Exchange Coupling in Artificial Perovskite Iridate Superlattices

Two-Dimensional Jeff=1/2 Antiferromagnetic Insulator Unraveled from Interlayer Exchange Coupling in Artificial Perovskite Iridate Superlattices

Non-equilibrium Phenomena in Superconductors Probed by Femtosecond Time-Domain Spectroscopy

Theoretical understanding of photon spectroscopies in correlated materials in and out of equilibrium

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