Ka Ho Wong
Current Organizations / Institutes
The organizations/institutes from the scholar's latest article
Previous Organizations / Institutes
The organizations / institutes from the scholar's other articles in the past ten years
Research Subjects
Ka Ho Wong has a total of 18 co-authors. Here are the top co-authors by number of shared publications:
- Dirk K. Morr
University of Illinois Chicago
7 shared publications - Arbaz Malik
Department of Physics, University of Illinois at Chicago, Chicago, Illinois 60607, USA
3 shared publications Jacopo Gliozzi
Department of Physics and Institute for Condensed Matter Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
3 shared publications- Mark R. Hirsbrunner
University of Toronto
3 shared publications Taylor L. Hughes
Department of Physics and Institute for Condensed Matter Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
3 shared publications- Barry Bradlyn
Department of Physics University of Illinois Urbana-Champaign 61801 Urbana IL USA
2 shared publications
Latest Publications
- 24 October 2025
- Published by American Physical Society (APS) in Physical Review B
- Vol. 112 (13)
Measuring the Debye energy in superconductors via two-electron photoemission spectroscopy
- 24 October 2025
- Published by American Physical Society (APS) in Physical Review B
- Vol. 112 (13)
Measuring the Debye energy in superconductors via two-electron photoemission spectroscopy
- 23 April 2024
- Published by American Physical Society (APS) in Physical Review B
- Vol. 109 (14) , 144521
Competing higher order topological superconducting phases in triangular lattice magnet-superconductor hybrid systems
We demonstrate that a plethora of higher order topological phases emerge in magnet-superconductor hybrid (MSH) systems through the interplay of a stacked magnetic structure and an underlying triangular surface lattice; the latter being of great current experimental interest. Such lattices offer the ability to create three main types of edge terminations — called -, - and -edges — of MSH islands that, in turn, give rise to a complex phase diagrams exhibiting various regions of higher order topological superconducting (HOTSC) phases. We identify the single adatom chain, as well as a pair of adjacent adatom chains (called a double-chain), as the basic building blocks for the emergence of HOTSC phases. Of particular interest are those HOTSC phases which arise from a competition between the topology of single- and double-chain blocks, which are absent for square lattices.- 23 April 2024
- Published by American Physical Society (APS) in Physical Review B
- Vol. 109 (14) , 144521
Competing higher order topological superconducting phases in triangular lattice magnet-superconductor hybrid systems
We demonstrate that a plethora of higher order topological phases emerge in magnet-superconductor hybrid (MSH) systems through the interplay of a stacked magnetic structure and an underlying triangular surface lattice; the latter being of great current experimental interest. Such lattices offer the ability to create three main types of edge terminations — called -, - and -edges — of MSH islands that, in turn, give rise to a complex phase diagrams exhibiting various regions of higher order topological superconducting (HOTSC) phases. We identify the single adatom chain, as well as a pair of adjacent adatom chains (called a double-chain), as the basic building blocks for the emergence of HOTSC phases. Of particular interest are those HOTSC phases which arise from a competition between the topology of single- and double-chain blocks, which are absent for square lattices.- 4 March 2024
- Published by American Physical Society (APS) in Physical Review B
- Vol. 109 (9) , 094503
Two-electron photoemission spectroscopy in topological superconductors
We demonstrate that the photoelectron counting rate, , measured in two-electron coincidence spectroscopy experiments, provides insight into the nature of topological superconductivity. In particular, we show that the spin dependence of allows one to detect superconducting spin-triplet correlations that are induced in a topological superconductor even in the absence of an associated triplet superconducting order parameter. This ability to detect spin-triplet correlations allows one to distinguish between two recently proposed scenarios for the microscopic origin of topological superconductivity in . Finally, we show that exhibits a characteristic intensity maximum that can be employed to detect topological phase transitions.- 4 March 2024
- Published by American Physical Society (APS) in Physical Review B
- Vol. 109 (9) , 094503
Two-electron photoemission spectroscopy in topological superconductors
We demonstrate that the photoelectron counting rate, , measured in two-electron coincidence spectroscopy experiments, provides insight into the nature of topological superconductivity. In particular, we show that the spin dependence of allows one to detect superconducting spin-triplet correlations that are induced in a topological superconductor even in the absence of an associated triplet superconducting order parameter. This ability to detect spin-triplet correlations allows one to distinguish between two recently proposed scenarios for the microscopic origin of topological superconductivity in . Finally, we show that exhibits a characteristic intensity maximum that can be employed to detect topological phase transitions.- 15 June 2023
- Published by American Physical Society (APS) in Physical Review B
- Vol. 107 (21) , 214514
Competing topological superconducting phases inWe demonstrate that recent angle-resolved photoemission spectroscopy experiments provide strong evidence for the existence of two competing topological superconducting phases in . The coupling of their underlying microscopic mechanisms—one based on a three-dimensional topological insulator, one based on two-dimensional superconductivity—stabilizes topological superconductivity over a wide range of parameters, and gives rise to two disjoint topological regions in the phase diagram of . We show that the topological origin of these regions can be identified by considering the form of Majorana edge modes at domain walls.- 15 June 2023
- Published by American Physical Society (APS) in Physical Review B
- Vol. 107 (21) , 214514
Competing topological superconducting phases inWe demonstrate that recent angle-resolved photoemission spectroscopy experiments provide strong evidence for the existence of two competing topological superconducting phases in . The coupling of their underlying microscopic mechanisms—one based on a three-dimensional topological insulator, one based on two-dimensional superconductivity—stabilizes topological superconductivity over a wide range of parameters, and gives rise to two disjoint topological regions in the phase diagram of . We show that the topological origin of these regions can be identified by considering the form of Majorana edge modes at domain walls.- Open Access
- 14 June 2023
- Published by Springer Nature in npj Quantum Materials
- Vol. 8 (1) , 1
Author Correction: Higher order topological superconductivity in magnet-superconductor hybrid systems
- 14 June 2023
- Published by Springer Nature in npj Quantum Materials
- Vol. 8 (1) , 1
Open AccessAuthor Correction: Higher order topological superconductivity in magnet-superconductor hybrid systems
- Open Access
- 2 June 2023
- Published by Springer Nature in npj Quantum Materials
- Vol. 8 (1) , 1-7
Higher order topological superconductivity in magnet-superconductor hybrid systems
Quantum engineering of topological superconductors and of the ensuing Majorana zero modes might hold the key for realizing topological quantum computing and topology-based devices. Magnet-superconductor hybrid (MSH) systems have proven to be experimentally versatile platforms for the creation of topological superconductivity by custom-designing the complex structure of their magnetic layer. Here, we demonstrate that higher order topological superconductivity (HOTSC) can be realized in two-dimensional MSH systems by using stacked magnetic structures. We show that the sensitivity of the HOTSC to the particular magnetic stacking opens an intriguing ability to tune the system between trivial and topological phases using atomic manipulation techniques. We propose that the realization of HOTSC in MSH systems, and in particular the existence of the characteristic Majorana corner modes, allows for the implementation of a measurement-based protocols for topological quantum computing.
- 2 June 2023
- Published by Springer Nature in npj Quantum Materials
- Vol. 8 (1) , 1-7
Open AccessHigher order topological superconductivity in magnet-superconductor hybrid systems
Quantum engineering of topological superconductors and of the ensuing Majorana zero modes might hold the key for realizing topological quantum computing and topology-based devices. Magnet-superconductor hybrid (MSH) systems have proven to be experimentally versatile platforms for the creation of topological superconductivity by custom-designing the complex structure of their magnetic layer. Here, we demonstrate that higher order topological superconductivity (HOTSC) can be realized in two-dimensional MSH systems by using stacked magnetic structures. We show that the sensitivity of the HOTSC to the particular magnetic stacking opens an intriguing ability to tune the system between trivial and topological phases using atomic manipulation techniques. We propose that the realization of HOTSC in MSH systems, and in particular the existence of the characteristic Majorana corner modes, allows for the implementation of a measurement-based protocols for topological quantum computing.
- 21 June 2022
- Published by American Physical Society (APS) in Physical Review B
- Vol. 105 (22) , L220504
Shot noise and differential conductance as signatures of putative topological superconductivity inWe present a theory for the differential shot noise, , as measured via shot-noise scanning tunneling spectroscopy, and the differential conductance, , for tunneling into Majorana zero modes (MZMs) in the putative topological superconductor . We demonstrate that for tunneling into chiral Majorana edge modes near domain walls, as well as MZMs localized in vortex cores and at the end of defect lines, vanishes whenever reaches a quantized value being equal to the quantum of conductance. These results are independent of the particular orbital tunneling path, thus establishing a vanishing concomitant with a quantized , as universal signatures for Majorana modes in two-dimensional topological superconductors, irrespective of the material's specific complex electronic band structure.- 21 June 2022
- Published by American Physical Society (APS) in Physical Review B
- Vol. 105 (22) , L220504
Shot noise and differential conductance as signatures of putative topological superconductivity inWe present a theory for the differential shot noise, , as measured via shot-noise scanning tunneling spectroscopy, and the differential conductance, , for tunneling into Majorana zero modes (MZMs) in the putative topological superconductor . We demonstrate that for tunneling into chiral Majorana edge modes near domain walls, as well as MZMs localized in vortex cores and at the end of defect lines, vanishes whenever reaches a quantized value being equal to the quantum of conductance. These results are independent of the particular orbital tunneling path, thus establishing a vanishing concomitant with a quantized , as universal signatures for Majorana modes in two-dimensional topological superconductors, irrespective of the material's specific complex electronic band structure.