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Li Y, Chan YH, Hlevyack JA, Bowers JW, Chou MY, Chiang TC. Topological Quantum Well States in Pb/Sb Thin-Film Heterostructures. ACS Nano 2024; 18:10243-10248. [PMID: 38530641 PMCID: PMC11008363 DOI: 10.1021/acsnano.4c00724] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2024] [Revised: 03/12/2024] [Accepted: 03/21/2024] [Indexed: 03/28/2024]
Abstract
Composite topological heterostructures, wherein topologically protected states are electronically tuned due to their proximity to other matter, are key avenues for exploring emergent physical phenomena. Particularly, pairing a topological material with a superconductor such as Pb is a promising means for generating a topological superconducting phase with exotic Majorana quasiparticles, but oft-neglected is the emergence of bulklike spin-polarized states that are quite relevant to applications. Using high-resolution photoemission spectroscopy and first-principles calculations, we report the emergence of bulk-like spin-polarized topological quantum well states with long coherence lengths in Pb films grown on the topological semimetal Sb. The results establish Pb/Sb heterostructures as topological superconductor candidates and advance the current understanding of topological coupling effects required for realizing emergent physics and for designing advanced spintronic device architectures.
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Affiliation(s)
- Yao Li
- Department
of Physics and Frederick Seitz Materials Research Laboratory, University of Illinois Urbana−Champaign; Urbana, Illinois 61801, United States
| | - Yang-hao Chan
- Institute
of Atomic and Molecular Sciences, Academia
Sinica, Taipei 10617, Taiwan
- Physics
Division, National Center for Theoretical
Sciences, Taipei 10617, Taiwan
| | - Joseph A. Hlevyack
- Department
of Physics and Frederick Seitz Materials Research Laboratory, University of Illinois Urbana−Champaign; Urbana, Illinois 61801, United States
| | - John W. Bowers
- Department
of Physics and Frederick Seitz Materials Research Laboratory, University of Illinois Urbana−Champaign; Urbana, Illinois 61801, United States
| | - Mei-Yin Chou
- Institute
of Atomic and Molecular Sciences, Academia
Sinica, Taipei 10617, Taiwan
- Department
of Physics, National Taiwan University, Taipei 10617, Taiwan
| | - Tai-Chang Chiang
- Department
of Physics and Frederick Seitz Materials Research Laboratory, University of Illinois Urbana−Champaign; Urbana, Illinois 61801, United States
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Li Y, Bowers JW, Hlevyack JA, Lin MK, Chiang TC. Emergent and Tunable Topological Surface States in Complementary Sb/Bi 2Te 3 and Bi 2Te 3/Sb Thin-Film Heterostructures. ACS Nano 2022; 16:9953-9959. [PMID: 35699943 PMCID: PMC9245572 DOI: 10.1021/acsnano.2c04639] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2022] [Accepted: 06/09/2022] [Indexed: 06/15/2023]
Abstract
Epitaxial thin-film heterostructures offer a versatile platform for realizing topological surface states (TSSs) that may be emergent and/or tunable by tailoring the atomic layering in the heterostructures. Here, as an experimental demonstration, Sb and Bi2Te3 thin films with closely matched in-plane lattice constants are chosen to form two complementary heterostructures: Sb overlayers on Bi2Te3 (Sb/Bi2Te3) and Bi2Te3 overlayers on Sb (Bi2Te3/Sb), with the overlayer thickness as a tuning parameter. In the bulk form, Sb (a semimetal) and Bi2Te3 (an insulator) both host TSSs with the same topological order but substantially different decay lengths and dispersions, whereas ultrathin Sb and Bi2Te3 films by themselves are fully gapped trivial insulators. Angle-resolved photoemission band mappings, aided by theoretical calculations, confirm the formation of emergent TSSs in both heterostructures. The energy position of the topological Dirac point varies as a function of overlayer thickness, but the variation is non-monotonic, indicating nontrivial effects in the formation of topological heterostructure systems. The results illustrate the rich physics of engineered composite topological systems that may be exploited for nanoscale spintronics applications.
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Affiliation(s)
- Yao Li
- Department
of Physics, University of Illinois at Urbana−Champaign, Urbana, Illinois 61801, United States
- Frederick
Seitz Materials Research Laboratory, University
of Illinois at Urbana−Champaign, Urbana, Illinois 61801, United States
| | - John W. Bowers
- Department
of Physics, University of Illinois at Urbana−Champaign, Urbana, Illinois 61801, United States
- Frederick
Seitz Materials Research Laboratory, University
of Illinois at Urbana−Champaign, Urbana, Illinois 61801, United States
| | - Joseph A. Hlevyack
- Department
of Physics, University of Illinois at Urbana−Champaign, Urbana, Illinois 61801, United States
- Frederick
Seitz Materials Research Laboratory, University
of Illinois at Urbana−Champaign, Urbana, Illinois 61801, United States
| | - Meng-Kai Lin
- Department
of Physics, University of Illinois at Urbana−Champaign, Urbana, Illinois 61801, United States
- Frederick
Seitz Materials Research Laboratory, University
of Illinois at Urbana−Champaign, Urbana, Illinois 61801, United States
- Department
of Physics, National Central University, Taoyuan 32001, Taiwan
| | - Tai-Chang Chiang
- Department
of Physics, University of Illinois at Urbana−Champaign, Urbana, Illinois 61801, United States
- Frederick
Seitz Materials Research Laboratory, University
of Illinois at Urbana−Champaign, Urbana, Illinois 61801, United States
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Gulsby WD, Killmaster CH, Bowers JW, Miller KV. Effects of restrictive harvest criteria on antler size of hunter‐harvested male white‐tailed deer and hunter opportunity. WILDLIFE SOC B 2019. [DOI: 10.1002/wsb.973] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- William D. Gulsby
- School of Forestry and Wildlife SciencesAuburn UniversityAuburn AL 36849 USA
| | - Charlie H. Killmaster
- Georgia Department of Natural ResourcesWildlife Resources Division 2065 United States Highway 278 SE, Social Circle GA 30025 USA
| | - John W. Bowers
- Georgia Department of Natural ResourcesWildlife Resources Division 2067 United States Highway 278 SE, Social Circle GA 30025 USA
| | - Karl V. Miller
- Warnell School of Forestry and Natural ResourcesUniversity of GeorgiaAthens GA 30602 USA
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4
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Gulsby WD, Killmaster CH, Bowers JW, Laufenberg JS, Sacks BN, Statham MJ, Miller KV. Efficacy and precision of fecal genotyping to estimate coyote abundance. WILDLIFE SOC B 2016. [DOI: 10.1002/wsb.712] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- William D. Gulsby
- School of Forestry and Wildlife Sciences; Auburn University; Auburn AL 36849 USA
| | - Charlie H. Killmaster
- Georgia Department of Natural Resources; Wildlife Resources Division; 2070 United States Highway 278 SE, Social Circle GA 30025 USA
| | - John W. Bowers
- Georgia Department of Natural Resources; Wildlife Resources Division; 2070 United States Highway 278 SE, Social Circle GA 30025 USA
| | - Jared S. Laufenberg
- Department of Fish, Wildlife, and Conservation Biology; Colorado State University; 1474 Campus Delivery Fort Collins CO 80523 USA
| | - Benjamin N. Sacks
- Mammalian Ecology and Conservation Unit, Veterinary Genetics Laboratory, Department of Population Health and Reproduction; University of California; Davis, One Shields Avenue/Old Davis Road Davis CA 95616 USA
| | - Mark J. Statham
- Mammalian Ecology and Conservation Unit, Veterinary Genetics Laboratory; University of California; Davis, One Shields Avenue/Old Davis Road Davis CA 95616 USA
| | - Karl V. Miller
- Warnell School of Forestry and Natural Resources; University of Georgia; Athens GA 30602 USA
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Opachich YP, Koch JA, Haugh MJ, Romano E, Lee JJ, Huffman E, Weber FA, Bowers JW, Benedetti LR, Wilson M, Prisbrey ST, Wehrenberg CE, Baumann TF, Lenhardt JM, Cook A, Arsenlis A, Park HS, Remington BA. A multi-wavelength, high-contrast contact radiography system for the study of low-density aerogel foams. Rev Sci Instrum 2016; 87:073706. [PMID: 27475564 DOI: 10.1063/1.4958826] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2015] [Accepted: 07/02/2016] [Indexed: 06/06/2023]
Abstract
A multi-wavelength, high contrast contact radiography system has been developed to characterize density variations in ultra-low density aerogel foams. These foams are used to generate a ramped pressure drive in materials strength experiments at the National Ignition Facility and require precision characterization in order to reduce errors in measurements. The system was used to characterize density variations in carbon and silicon based aerogels to ∼10.3% accuracy with ∼30 μm spatial resolution. The system description, performance, and measurement results collected using a 17.8 mg/cc carbon based JX-6 (C20H30) aerogel are discussed in this manuscript.
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Affiliation(s)
- Y P Opachich
- National Security Technologies, LLC, Livermore, California 94550, USA
| | - J A Koch
- National Security Technologies, LLC, Livermore, California 94550, USA
| | - M J Haugh
- National Security Technologies, LLC, Livermore, California 94550, USA
| | - E Romano
- National Security Technologies, LLC, Livermore, California 94550, USA
| | - J J Lee
- National Security Technologies, LLC, Livermore, California 94550, USA
| | - E Huffman
- National Security Technologies, LLC, Livermore, California 94550, USA
| | - F A Weber
- National Security Technologies, LLC, Livermore, California 94550, USA
| | - J W Bowers
- National Security Technologies, LLC, Livermore, California 94550, USA
| | - L R Benedetti
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - M Wilson
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - S T Prisbrey
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - C E Wehrenberg
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - T F Baumann
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - J M Lenhardt
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - A Cook
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - A Arsenlis
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - H-S Park
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
| | - B A Remington
- Lawrence Livermore National Laboratory, Livermore, California 94551, USA
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Belser EH, Cohen BS, Keeler SP, Killmaster CH, Bowers JW, Miller KV. Epethelial presence of Trueperella pyogenes predicts site-level presence of cranial abscess disease in white-tailed deer (Odocoileus virginianus). PLoS One 2015; 10:e0120028. [PMID: 25803047 PMCID: PMC4372218 DOI: 10.1371/journal.pone.0120028] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2014] [Accepted: 01/22/2015] [Indexed: 02/03/2023] Open
Abstract
Cranial/intracranial abscess disease is an emerging source of significant mortality for male white-tailed deer (Odocoileus virginianus). Most cases of cranial/intracranial abscess disease are associated with infection by the opportunistic pathogen Trueperella pyogenes although the relationship between the prevalence of the bacteria and occurrence of disease is speculative. We examined 5,612 hunter-harvested deer from 29 sites across all physiographic provinces in Georgia for evidence of cranial abscess disease and sampled the forehead, lingual, and nasal surfaces from 692 deer. We used polymerase chain reaction (PCR) to determine presence of T. pyogenes from these samples. We found T. pyogenes prevalence at a site was a predictor for the occurrence of cranial abscess disease. Prevalence of T. pyogenes did not differ between samples from the nose or tongue although prevalence along the forehead was greater for males than females (p = 0.04), particularly at sites with high occurrence of this disease. Socio-sexual behaviors, bacterial prevalence, or physiological characteristics may predispose male deer to intracranial/cranial abscess disease. Determination of factors that affect T. pyogenes prevalence among sites may help explain the occurrence of this disease among populations.
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Affiliation(s)
- Emily H. Belser
- Warnell School of Forestry and Natural Resources, University of Georgia, Athens, Georgia, United States of America
| | - Bradley S. Cohen
- Warnell School of Forestry and Natural Resources, University of Georgia, Athens, Georgia, United States of America
- * E-mail:
| | - Shamus P. Keeler
- Southeastern Cooperative Wildlife Disease Study, College of Veterinary Medicine, The University of Georgia, Athens, Georgia, United States of America
| | - Charles H. Killmaster
- Georgia Department of Natural Resources, Wildlife Division, Social Circle, Georgia, United States of America
| | - John W. Bowers
- Georgia Department of Natural Resources, Wildlife Division, Social Circle, Georgia, United States of America
| | - Karl V. Miller
- Warnell School of Forestry and Natural Resources, University of Georgia, Athens, Georgia, United States of America
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Gulsby WD, Killmaster CH, Bowers JW, Kelly JD, Sacks BN, Statham MJ, Miller KV. White-tailed deer fawn recruitment before and after experimental coyote removals in central Georgia. WILDLIFE SOC B 2015. [DOI: 10.1002/wsb.534] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- William D. Gulsby
- Warnell School of Forestry and Natural Resources; University of Georgia; Athens GA 30602 USA
| | - Charlie H. Killmaster
- Georgia Department of Natural Resources; Wildlife Resources Division; 2070 United States Highway 278, SE, Social Circle, GA 30025 USA
| | - John W. Bowers
- Georgia Department of Natural Resources; Wildlife Resources Division; 2070 United States Highway 278, SE, Social Circle, GA 30025 USA
| | - James D. Kelly
- New York State Department of Environmental Conservation; Division of Fish, Wildlife, and Marine Resources; 625 Broadway, 5th floor, Albany NY 12233 USA
| | - Benjamin N. Sacks
- Mammalian Ecology and Conservation Unit, Veterinary Genetics Laboratory, Department of Population Health and Reproduction; University of California; Davis One Shields Avenue/Old Davis Road, Davis, CA 95616 USA
| | - Mark J. Statham
- Mammalian Ecology and Conservation Unit, Veterinary Genetics Laboratory; University of California, Davis; One Shields Avenue/Old Davis Road, Davis CA 95616 USA
| | - Karl V. Miller
- Warnell School of Forestry and Natural Resources; University of Georgia; Athens GA 30602 USA
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Bowers JW. Forced retirement and the ADEA. Indiana Med 1990; 83:912-4. [PMID: 2280065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- J W Bowers
- Beers, Mallers, Backs & Salin, Fort Wayne
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Bowers JW. New Federal law governs 'patient dumping'. Indiana Med 1990; 83:496-7. [PMID: 2373855] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- J W Bowers
- Beers, Mallers, Backs & Salin, Fort Wayne
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