101
|
Lee D, Kim JK, Skinner CJ. Within-cluster resampling for multilevel models under informative cluster size. Biometrika 2019. [DOI: 10.1093/biomet/asz035] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Summary
A within-cluster resampling method is proposed for fitting a multilevel model in the presence of informative cluster size. Our method is based on the idea of removing the information in the cluster sizes by drawing bootstrap samples which contain a fixed number of observations from each cluster. We then estimate the parameters by maximizing an average, over the bootstrap samples, of a suitable composite loglikelihood. The consistency of the proposed estimator is shown and does not require that the correct model for cluster size is specified. We give an estimator of the covariance matrix of the proposed estimator, and a test for the noninformativeness of the cluster sizes. A simulation study shows, as in Neuhaus & McCulloch (2011), that the standard maximum likelihood estimator exhibits little bias for some regression coefficients. However, for those parameters which exhibit nonnegligible bias, the proposed method is successful in correcting for this bias.
Collapse
|
102
|
LEE H, An J, Lee D, Park H. MON-145 THE RELATIONSHIP BETWEEN OSTEOPOROSIS AND THE NUTRITIONAL STATUS REPRESENTED BY NORMALIZED PROTEIN CATABOLIC RATE (nPCR) IN HEMODIALYSIS PATIENTS. Kidney Int Rep 2019. [DOI: 10.1016/j.ekir.2019.05.937] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
|
103
|
Park Y, Li Y, Choi M, Kim J, Lee D. Novel SN-38 double core-shell micelle formulation, SNB-101, enhanced anti-tumor effect and tolerance. Ann Oncol 2019. [DOI: 10.1093/annonc/mdz155.076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
104
|
LEE H, An J, Lee D, Park H. MON-146 THE RELATIONSHIP BETWEEN THE DIALYSIS ADEQUACY AS ASSESSED BY UREA KINETIC MODELING (Kt/Vurea) AND OSTEOPOROSIS IN HEMODIALYSIS PATIENTS. Kidney Int Rep 2019. [DOI: 10.1016/j.ekir.2019.05.938] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
|
105
|
Lee AC, Lee Y, Lee D, Kwon S. Divide and conquer: A perspective on biochips for single-cell and rare-molecule analysis by next-generation sequencing. APL Bioeng 2019; 3:020901. [PMID: 31431936 PMCID: PMC6697027 DOI: 10.1063/1.5095962] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2019] [Accepted: 05/29/2019] [Indexed: 02/06/2023] Open
Abstract
Recent advances in biochip technologies that connect next-generation sequencing (NGS) to real-world problems have facilitated breakthroughs in science and medicine. Because biochip technologies are themselves used in sequencing technologies, the main strengths of biochips lie in their scalability and throughput. Through the advantages of biochips, NGS has facilitated groundbreaking scientific discoveries and technical breakthroughs in medicine. However, all current NGS platforms require nucleic acids to be prepared in a certain range of concentrations, making it difficult to analyze biological systems of interest. In particular, many of the most interesting questions in biology and medicine, including single-cell and rare-molecule analysis, require strategic preparation of biological samples in order to be answered. Answering these questions is important because each cell is different and exists in a complex biological system. Therefore, biochip platforms for single-cell or rare-molecule analyses by NGS, which allow convenient preparation of nucleic acids from biological systems, have been developed. Utilizing the advantages of miniaturizing reaction volumes of biological samples, biochip technologies have been applied to diverse fields, from single-cell analysis to liquid biopsy. From this perspective, here, we first review current state-of-the-art biochip technologies, divided into two broad categories: microfluidic- and micromanipulation-based methods. Then, we provide insights into how future biochip systems will aid some of the most important biological and medical applications that require NGS. Based on current and future biochip technologies, we envision that NGS will come ever closer to solving more real-world scientific and medical problems.
Collapse
|
106
|
Cardona A, Ning X, Smart S, Chandrasekaran P, Wei C, Mccarthy B, Lee D, Raman SV. 528Left ventricular dysfunction, not myocardial injury, drives use of cardioprotective medications in acute myocarditis: insights from machine learning. Eur Heart J Cardiovasc Imaging 2019. [DOI: 10.1093/ehjci/jez115.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
|
107
|
Lee D, Ko Y, Won H, Sun D. TREATMENT OUTCOMES OF INVOLVED-FIELD RADIOTHERAPY IN ELDERLY PATIENTS WITH HIGH-GRADE OR RECURRENT NON-HODGKIN LYMPHOMA. Hematol Oncol 2019. [DOI: 10.1002/hon.93_2631] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
108
|
Staley A, Tucker K, Fang Z, Sun W, Yin Y, Zhang Y, Lee D, Zhou C, Bae-Jump V. PD-1 inhibitor treatment impacts both immune and metabolic pathways in obesity-driven endometrial cancer. Gynecol Oncol 2019. [DOI: 10.1016/j.ygyno.2019.04.115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
109
|
Kim E, Kim Y, Kim S, Quan Q, Tian Y, Shin C, Lee D, Chung J. 750 Ultraviolet irradiation modulates appetite and energy homeostasis in mice by hormonal regulation. J Invest Dermatol 2019. [DOI: 10.1016/j.jid.2019.03.826] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
110
|
Scarlata MJ, Lee SH, Lee D, Kandigian SE, Hiller AJ, Dishart JG, Mintz GE, Wang Z, Coste GI, Mousley AL, Soler I, Lawson K, Ng AJ, Bezek JL, Bergstrom HC. Chemogenetic stimulation of the infralimbic cortex reverses alcohol-induced fear memory overgeneralization. Sci Rep 2019; 9:6730. [PMID: 31040357 PMCID: PMC6491487 DOI: 10.1038/s41598-019-43159-w] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2019] [Accepted: 04/16/2019] [Indexed: 01/28/2023] Open
Abstract
Post-traumatic stress disorder (PTSD) and alcohol use disorder (AUD) are often comorbid. Drinking tends to increase following trauma, which may exacerbate PTSD-related symptoms. Despite a clear relationship between excessive alcohol use and PTSD, how alcohol impacts the expression of traumatic fear remains unclear. This study aims to determine the neurobehavioral impact of chronic alcohol (ethanol; EtOH) on the expression of established fear memories in C57BL/6 N mice. We show that chronic EtOH selectively augments cued fear memory generalization and impairs fear extinction retrieval, leaving the expression of the original cued response intact. Immunohistochemistry for Arc/arg3.1 (Arc) revealed EtOH-induced decreases in Arc expression in the infralimbic cortex (IL) and basolateral amygdala complex (BLA) that were associated with cued fear memory overgeneralization. Chemogenetic stimulation of IL pyramidal neurons reversed EtOH-driven fear memory overgeneralization, identifying a role for the IL in cued fear memory precision. Considering the modulatory influence of the IL over conditioned fear expression, these data suggest a model whereby chronic EtOH-driven neuroadaptations in the IL promote fear memory overgeneralization. These findings provide new mechanistic insight into how excessive alcohol use, following exposure to a traumatic event, can exacerbate symptoms of traumatic fear.
Collapse
|
111
|
Reuter K, Lee D. Evaluating patients' perspectives on social media: the importance of clearly reporting data search, cleaning and processing. Br J Dermatol 2019; 181:222. [PMID: 30851190 DOI: 10.1111/bjd.17868] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
112
|
Lee D, Amadi A, Sabater J, Ellis J, Johnson H, Kotapati S, McNamara S, Walker A, Cooper M, Patterson K, Roskell N, Meng Y. Can We Accurately Predict Cost Effectiveness Without Access to Overall Survival Data? The Case Study of Nivolumab in Combination with Ipilimumab for the Treatment of Patients with Advanced Melanoma in England. PHARMACOECONOMICS - OPEN 2019; 3:43-54. [PMID: 29790020 PMCID: PMC6393277 DOI: 10.1007/s41669-018-0080-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
BACKGROUND Nivolumab with ipilimumab (the Regimen) is the first immuno-oncology combination treatment to demonstrate long-term clinical benefit for advanced melanoma patients. We evaluated the cost effectiveness of the Regimen in this population, with and without the availability of overall survival (OS) data. METHODS A partitioned survival model and a Markov state-transition model were developed to estimate the lifetime costs and benefits of the Regimen versus ipilimumab. These models were built with and without the availability of OS data, as only progression-free survival data were available from the head-to-head, phase III trial against ipilimumab at the time of the National Institute for Health and Care Excellence (NICE) submission. Patient utilities and resource use data were sourced from trial data or the literature. RESULTS Incremental cost-effectiveness ratios (ICERs) and absolute costs were similar between the models with and without OS data, but the model with OS data generated more than 1 additional quality-adjusted life-year (QALY) across both treatment arms. In both models, based on list prices, the Regimen was the most cost-effective treatment. CONCLUSIONS The analyses show that the Regimen is a cost-effective treatment for advanced melanoma patients in England, and methods to overcome the lack of OS can give reasonable estimates of QALYs gained and ICERs.
Collapse
|
113
|
Lee D, Amadi A, Sabater J, Ellis J, Johnson H, Kotapati S, McNamara S, Walker A, Cooper M, Patterson K, Roskell N, Meng Y. Correction to: Can We Accurately Predict Cost Effectiveness Without Access to Overall Survival Data? The Case Study of Nivolumab in Combination with Ipilimumab for the Treatment of Patients with Advanced Melanoma in England. PHARMACOECONOMICS - OPEN 2019; 3:127. [PMID: 30206825 PMCID: PMC6393273 DOI: 10.1007/s41669-018-0096-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The second Key Point for Decision Makers, which reads.
Collapse
|
114
|
Han K, Kim M, Lee D, Won J, Kim G, Kwon J, Han S, Kim D, Kim H, Baek S, Lee J. 03:09 PM Abstract No. 412 Safety of co-placement of ventriculoperitoneal shunt and percutaneous radiologic gastrostomy. J Vasc Interv Radiol 2019. [DOI: 10.1016/j.jvir.2018.12.490] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
|
115
|
Kwon J, Han K, Lee J, Won J, Kim M, Kim G, Lee D, Han S, Baek S. Abstract No. 510 Safety and efficacy of percutaneous cryoablation for small hepatocellular carcinomas adjacent to the heart. J Vasc Interv Radiol 2019. [DOI: 10.1016/j.jvir.2018.12.591] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
|
116
|
Marsh CL, Kurian SM, Rice JC, Whisenant TC, David J, Rose S, Schieve C, Lee D, Case J, Barrick B, Peddi VR, Mannon RB, Knight R, Maluf D, Mandelbrot D, Patel A, Friedewald JJ, Abecassis MM, First MR. Application of TruGraf v1: A Novel Molecular Biomarker for Managing Kidney Transplant Recipients With Stable Renal Function. Transplant Proc 2019; 51:722-728. [PMID: 30979456 DOI: 10.1016/j.transproceed.2019.01.054] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2018] [Revised: 12/10/2018] [Accepted: 01/17/2019] [Indexed: 01/22/2023]
Abstract
TruGraf v1 is a laboratory-developed DNA microarray-based gene expression blood test to enable proactive noninvasive serial assessment of kidney transplant recipients with stable renal function. It has been previously validated in patients identified as Transplant eXcellence (TX: stable serum creatinine, normal biopsy results, indicative of immune quiescence), and not-TX (renal dysfunction and/or rejection on biopsy results). TruGraf v1 is intended for use in subjects with stable renal function to measure the immune status as an alternative to invasive, expensive, and risky surveillance biopsies. MATERIALS AND METHODS In this study, simultaneous blood tests and clinical assessments were performed in 192 patients from 7 transplant centers to evaluate TruGraf v1. The molecular testing laboratory was blinded to renal function and biopsy results. RESULTS Overall, TruGraf v1 accuracy (concordance between TruGraf v1 result and clinical and/or histologic assessment) was 74% (142/192), and a result of TX was accurate in 116 of 125 (93%). The negative predictive value for TruGraf v1 was 90%, with a sensitivity 74% and specificity of 73%. Results did not significantly differ in patients with a biopsy-confirmed diagnosis vs those without a biopsy. CONCLUSIONS TruGraf v1 can potentially support a clinical decision enabling unnecessary surveillance biopsies with high confidence, making it an invaluable addition to the transplant physician's tool kit for managing patients. TruGraf v1 testing can potentially avoid painful and risky invasive biopsies, reduce health care costs, and enable frequent assessment of patients with stable renal function to confirm the presence of immune quiescence in the peripheral blood.
Collapse
|
117
|
Stephenson D, Perry A, Appleby MR, Lee D, Davison J, Johnston A, Jones AL, Nelson A, Bourke SJ, Thomas MF, De Soyza A, Lordan JL, Lumb J, Robb AE, Samuel JR, Walton KE, Perry JD. An evaluation of methods for the isolation of nontuberculous mycobacteria from patients with cystic fibrosis, bronchiectasis and patients assessed for lung transplantation. BMC Pulm Med 2019; 19:19. [PMID: 30665395 PMCID: PMC6341538 DOI: 10.1186/s12890-019-0781-2] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2018] [Accepted: 01/07/2019] [Indexed: 01/04/2023] Open
Abstract
BACKGROUND RGM medium is an agar-based, selective culture medium designed for the isolation of nontuberculous mycobacteria (NTM) from the sputum of patients with cystic fibrosis (CF). We evaluated RGM medium for the detection of NTM in patients with CF (405 samples), bronchiectasis (323 samples) and other lung diseases necessitating lung transplantation (274 samples). METHODS In total, 1002 respiratory samples from 676 patients were included in the study. Direct culture on RGM medium, with incubation at two temperatures (30 °C and 37 °C), was compared with conventional culture of decontaminated samples for acid-fast bacilli (AFB) using both a solid medium (Löwenstein-Jensen medium) and a liquid medium (the Mycobacterial Growth Indicator Tube; MGIT). RESULTS For all three patient groups, significantly more isolates of NTM were recovered using RGM medium incubated at 30 °C than by any other method (sensitivity: 94.6% vs. 22.4% for conventional AFB culture; P < 0.0001). Significantly more isolates of Mycobacterium abscessus complex were isolated on RGM at 30 °C than by AFB culture (sensitivity: 96.1% vs. 58.8%; P < 0.0001). The recovery of Mycobacterium avium complex was also greater using RGM medium at 30 °C compared to AFB culture (sensitivity: 83% vs. 70.2%), although this difference was not statistically significant and a combination of methods was necessary for optimal recovery (P = 0.21). CONCLUSIONS In the largest study of RGM medium to date, we reaffirm its utility for isolation of NTM from patients with CF. Furthermore; we show that it also provides an effective tool for culture of respiratory samples from patients with bronchiectasis and other lung diseases.
Collapse
|
118
|
Lee D, May K, Faramarzi B. Comparison of first and second acupuncture treatments in horses with chronic laminitis. IRANIAN JOURNAL OF VETERINARY RESEARCH 2019; 20:9-12. [PMID: 31191693 PMCID: PMC6509908] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 03/25/2018] [Revised: 11/01/2018] [Accepted: 11/10/2018] [Indexed: 06/09/2023]
Abstract
BACKGROUND Laminitis is a common but critical disease that causes severe pain and disability in horses. The etiology and pathogenesis of laminitis remain inconclusive and a multimodal therapeutic approach is generally indicated. Acupuncture has been used as a treatment option; however, the required number of treatments is still controversial due to the lack of objective scientific evidence. AIMS The objective of this study was to determine if the response to a second acupuncture treatment differed from the response to the first acupuncture treatment in horses with chronic laminitis. METHODS Fourteen horses with chronic laminitis were identified. Acupuncture points were determined based on the results of a diagnostic acupuncture palpation examination. The second acupuncture treatment and lameness examination were conducted one week after the first treatment. Ten minutes after each acupuncture treatment, a lameness examination was performed and included an objective examination using a body-mounted inertial sensor system called "Lameness Locator" and a routine lameness examination following the "American Association of Equine Practitioners" (AAEP) lameness scale. The level of lameness was statistically analyzed using paired t-test and Wilcoxon signed rank test with p-values <0.05 considered significant. RESULTS Both objective (P=0.042) and routine lameness examinations (P=0.027) showed that the level of lameness significantly decreased after the second acupuncture treatment compared to the response to the first treatment. CONCLUSION The results of this study suggest that continued acupuncture treatments will result in increasing levels of pain relief, showing the advantage of performing more than one acupuncture treatment in horses with chronic laminitis.
Collapse
|
119
|
First MR, Peddi VR, Mannon R, Knight R, Marsh CL, Kurian SM, Rice JC, Maluf D, Mandelbrot D, Patel A, David J, Schieve C, Lee D, Lewis P, Friedewald JJ, Abecassis MM, Rose S. Investigator Assessment of the Utility of the TruGraf Molecular Diagnostic Test in Clinical Practice. Transplant Proc 2018; 51:729-733. [PMID: 30979457 DOI: 10.1016/j.transproceed.2018.10.024] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2018] [Revised: 09/14/2018] [Accepted: 10/30/2018] [Indexed: 01/06/2023]
Abstract
BACKGROUND TruGraf v1 is a well-validated DNA microarray-based test that analyzes blood gene expression profiles as an indicator of immune status in kidney transplant recipients with stable renal function. METHODS In this study, investigators assessed clinical utility of the TruGraf test in patient management. In a retrospective study, simultaneous blood tests and clinical assessments were performed in 192 patients at 7 transplant centers, and in a prospective observational study they were performed in 45 subjects at 5 transplant centers. RESULTS When queried regarding whether or not the TruGraf test result impacted their decision regarding patient management, in 168 of 192 (87.5%) cases the investigator responded affirmatively. The prospective study indicated that TruGraf results supported physicians' decisions on patient management 87% (39/45) of the time, and in 93% of cases physicians indicated that they would use serial TruGraf testing in future patient management. A total of 21 of 39 (54%) reported results confirmed their decision that no intervention was needed, and 17 of 39 (44%) reported that results specifically informed them that a decision not to perform a surveillance biopsy was correct. CONCLUSIONS TruGraf is the first and only noninvasive test to be evaluated for clinical utility in determining rejection status of patients with stable renal function and shows promise of providing support for clinical decisions to avoid unnecessary surveillance biopsies with a high degree of confidence. TruGraf is an invaluable addition to the transplant physician's tool kit for managing patient health by avoiding painful and invasive biopsies, reducing health care costs, and enabling frequent assessment of patients with stable renal function to confirm immune quiescence.
Collapse
|
120
|
Wang H, Lee D, Jung H, Kim I. PSIII-42 Effects of non-genetically modified organism wheat on growth performance, nutrient digestibility, blood profile and meat quality in grower-finisher pigs. J Anim Sci 2018. [DOI: 10.1093/jas/sky404.696] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
|
121
|
Liu S, Cho J, Yun W, Lee C, Lee J, Kwak W, Oh H, Lee D. PSII-18 Effects of protein level and lysine: net energy ratio in growing-finishing pigs. J Anim Sci 2018. [DOI: 10.1093/jas/sky404.162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
122
|
Lee J, Yun W, Kwak W, Lee C, Liu S, Oh H, An J, Lee D, Cho J. PSVII-3 Influence of Season of Birth, Gender and Paternal line in Pigs. J Anim Sci 2018. [DOI: 10.1093/jas/sky404.128] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
123
|
Yun W, Lee J, Lee C, Kwak W, Oh H, Liu S, Lee D, Cho J. PSV-1 Effects of dietary oils on nutrient digestibility in the growing pigs under heat stress condition. J Anim Sci 2018. [DOI: 10.1093/jas/sky404.099] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
|
124
|
Vardi Y, Lee D. From Image Deblurring to Optimal Investments: Maximum Likelihood Solutions for Positive Linear Inverse Problems. ACTA ACUST UNITED AC 2018. [DOI: 10.1111/j.2517-6161.1993.tb01925.x] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
125
|
Lee D, Chung B, Shi Y, Kim GY, Campbell N, Xue F, Song K, Choi SY, Podkaminer JP, Kim TH, Ryan PJ, Kim JW, Paudel TR, Kang JH, Spinuzzi JW, Tenne DA, Tsymbal EY, Rzchowski MS, Chen LQ, Lee J, Eom CB. Isostructural metal-insulator transition in VO2. Science 2018; 362:1037-1040. [DOI: 10.1126/science.aam9189] [Citation(s) in RCA: 111] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2017] [Revised: 09/28/2017] [Accepted: 10/12/2018] [Indexed: 11/02/2022]
Abstract
The metal-insulator transition in correlated materials is usually coupled to a symmetry-lowering structural phase transition. This coupling not only complicates the understanding of the basic mechanism of this phenomenon but also limits the speed and endurance of prospective electronic devices. We demonstrate an isostructural, purely electronically driven metal-insulator transition in epitaxial heterostructures of an archetypal correlated material, vanadium dioxide. A combination of thin-film synthesis, structural and electrical characterizations, and theoretical modeling reveals that an interface interaction suppresses the electronic correlations without changing the crystal structure in this otherwise correlated insulator. This interaction stabilizes a nonequilibrium metallic phase and leads to an isostructural metal-insulator transition. This discovery will provide insights into phase transitions of correlated materials and may aid the design of device functionalities.
Collapse
|