Research

Quantum Transport Theory & Electronic Device Modeling

Research Directions

The scope of our research directions is to theoretically model and simulate electronic transport, with or without spin, in mesoscopic/nanoscale systems, using the real-space Green’s function method within tight-binding models, under both equilibrium and nonequilibrium circumstances. We currently focus on electronic transport in complex graphene devices, including single- and bi-layer graphene. Combining classical electrostatics and the Landauer-Büttiker approach, we perform realistic quantum transport simulations for real graphene devices, and are closely collaborating with different experimental groups, pursuing novel ballistic transport phenomena, particularly electron optics, in graphene.

Research Grant Numbers

NSTC 114-2112-M-006-029-MY3 (2025.08.01-2028.07.31)
NSTC 112-2112-M-006-019-MY3 (2023.08.01-2026.07.31)
MOST 109-2112-M-006-020-MY3 (2020.08.01-2023.09.30; completed)
MOST 107-2112-M-006-004-MY3 (2018.03.01-2020.07.31; completed)

Publications: 2020 - 2023

For latest unpublished works, see arXiv.org.

2024

Twisted Bilayer MoS2 under Electric Fields: A System with Tunable Symmetry

Aitor Garcia-Ruiz and Ming-Hao Liu

Nano Lett., 24, 16317 - Published 11 December 2024

Magnetotransport and Spin-Relaxation Signatures of the Radial Rashba and Dresselhaus Spin-Orbit Coupling in Proximitized Graphene

Wun-Hao Kang (康文豪), Michael Barth, Andreas Costa, Aitor Garcia-Ruiz, Alina Mreńca-Kolasińska, Ming-Hao Liu (劉明豪), and Denis Kochan

Phys. Rev. Lett. 133, 216201 – Published 19 November 2024

Magnetic Field-Induced Polar Order in Monolayer Molybdenum Disulfide Transistors

Duxing Hao, Wen-Hao Chang, Yu-Chen Chang, Wei-Tung Liu, Sheng-Zhu Ho, Chen-Hsuan Lu, Tilo H. Yang, Naoya Kawakami, Yi-Chun Chen, Ming-Hao Liu, Chun-Liang Lin, Ting-Hua Lu, Yann-Wen Lan, Nai-Chang Yeh

Adv. Mater. 2024, 2411393 - Published 30 October 2024

Four-band effective square-lattice model for Bernal-stacked bilayer graphene

Szu-Chao Chen (陳思超) , Alina Mreńca-Kolasińska, and Ming-Hao Liu (劉明豪)

Phys. Rev. Applied 22, 024039 – Published 13 August 2024

Electron wave and quantum optics in graphene

Himadri Chakraborti, Cosimo Gorini, Angelika Knothe, Ming-Hao Liu, Péter Makk, François D Parmentier, David Perconte, Klaus Richter, Preden Roulleau, Benjamin Sacépé, Christian Schönenberger and Wenmin Yang

J. Phys.: Condens. Matter 36, 393001 - Published 1 July 2024

Terahertz ratchet in graphene two-dimensional metamaterial formed by a patterned gate with an antidot array

I. Yahniuk, M. Hild, L. E. Golub, J. Amann, J. Eroms, D. Weiss, Wun-Hao Kang, Ming-Hao Liu, K. Watanabe, T. Taniguchi, and S. D. Ganichev

Phys. Rev. B 109, 235428 – Published 21 June 2024

2023

Ballistic transport spectroscopy of spin-orbit-coupled bands in monolayer graphene on WSe2

Qing Rao, Wun-Hao Kang, Hongxia Xue, Ziqing Ye, Xuemeng Feng, Kenji Watanabe, Takashi Taniguchi, Ning Wang, Ming-Hao Liu & Dong-Keun Ki

Nature Communications volume 14, Article number: 6124 - Published 30 September 2023

Probing miniband structure and Hofstadter butterfly in gated graphene superlattices via magnetotransport

Alina Mreńca-Kolasińska, Szu-Chao Chen & Ming-Hao Liu

npj 2D Materials and Applications volume 7, Article number: 64 - Published 09 September 2023

2022

Manipulating electron waves in graphene using carbon nanotube gating

Shiang-Bin Chiu (邱翔彬), Alina Mreńca-Kolasińska (柯琳娜), Ka Long Lei (李嘉朗), Ching-Hung Chiu (邱靖鈜), Wun-Hao Kang (康文豪), Szu-Chao Chen (陳思超), and Ming-Hao Liu (劉明豪)

Phys. Rev. B 105, 195416 – Published 16 May 2022

Quantum capacitive coupling between large-angle twisted graphene layers

Alina Mreńca-Kolasińska, Peter Rickhaus, Giulia Zheng, Klaus Richter, Thomas Ihn, Klaus Ensslin and Ming-Hao Liu

2D Mater. 9, 025013 - Published 25 February 2022

2021

Dirac fermion optics and directed emission from single- and bilayer graphene cavities

Jule-Katharina Schrepfer, Szu-Chao Chen (陳思超), Ming-Hao Liu (劉明豪), Klaus Richter, and Martina Hentschel

Phys. Rev. B 104, 155436 – Published 28 October 2021

2020

Cloning of zero modes in one-dimensional graphene superlattices

Wun-Hao Kang (康文豪), Szu-Chao Chen (陳思超), and Ming-Hao Liu (劉明豪)

Phys. Rev. B 102, 195432 – Published 30 November 2020 (arXiv:1912.13202)

Unconventional ferroelectricity in moiré heterostructures

Zhiren Zheng, Qiong Ma, Zhen Bi, Sergio de la Barrera, Ming-Hao Liu, Nannan Mao, Yang Zhang, Natasha Kiper, Kenji Watanabe, Takashi Taniguchi, Jing Kong, William A. Tisdale, Ray Ashoori, Nuh Gedik, Liang Fu, Su-Yang Xu & Pablo Jarillo-Herrero

Nature 588, 71–76 - Published: 23 November 2020

Anomalous Cyclotron Motion in Graphene Superlattice Cavities

Rainer Kraft, Ming-Hao Liu (劉明豪), Pranauv Balaji Selvasundaram, Szu-Chao Chen (陳思超), Ralph Krupke, Klaus Richter, and Romain Danneau

Phys. Rev. Lett. 125, 217701 – Published 17 November 2020

Editor's Suggestion

Valley splitter and transverse valley focusing in twisted bilayer graphene

Christophe De Beule, Peter G. Silvestrov, Ming-Hao Liu (劉明豪), and Patrik Recher

Phys. Rev. Research 2, 043151 – Published 28 October 2020 (arXiv:1912.03191)

Gate-Tunable Two-Dimensional Superlattices in Graphene

Robin Huber, Ming-Hao Liu, Szu-Chao Chen, Martin Drienovsky, Andreas Sandner, Kenji Watanabe, Takashi Taniguchi, Klaus Richter, Dieter Weiss, and Jonathan Eroms

Nano Lett. 21, 8046 - Published 15 October 2020 (arXiv:2003.07376)

Electrostatic superlattices on scaled graphene lattices

Szu-Chao Chen, Rainer Kraft, Romain Danneau, Klaus Richter, Ming-Hao Liu

Communications Physics volume 3, Article number: 71 - Published 28 April 2020 (arXiv:1907.03288)

The electronic thickness of graphene

Peter Rickhaus, Ming-Hao Liu, Marcin Kurpas, Annika Kurzmann, Yongjin Lee, Hiske Overweg, Marius Eich, Riccardo Pisoni, Takashi Taniguchi, Kenji Watanabe, Klaus Richter, Klaus Ensslin, Thomas Ihn

Science Advances Vol. 6, no. 11, eaay8409 - Published 13 March 2020 (arXiv:1907.00582)

Publications: 2012 - 2019

2019

Characterization of hydrogen plasma defined graphene edges

Mirko K. Rehmann, Yemliha B. Kalyoncu, Marcin Kisiela, Nikola Pascher, Franz J. Giessibl, Fabian Müller Kenji Watanabe, Takashi Taniguchi, Ernst Meyer, Ming-Hao Liu, Dominik M. Zumbühl

Carbon 150, 417 - Published 12 May 2019 (arXiv:1903.07002)

New Generation of Moiré Superlattices in Doubly Aligned hBN/Graphene/hBN Heterostructures

Lujun Wang, Simon Zihlmann, Ming-Hao Liu, Péter Makk, Kenji Watanabe, Takashi Taniguchi, Andreas Baumgartner, and Christian Schönenberger

Nano Lett. 19, 2371 - Published 25 February 2019 (arXiv:1812.10031)

2018

Transport Through a Network of Topological Channels in Twisted Bilayer Graphene

Peter Rickhaus, John Wallbank, Sergey Slizovskiy, Riccardo Pisoni, Hiske Overweg, Yongjin Lee, Marius Eich, Ming-Hao Liu, Kenji Watanabe, Takashi Taniguchi, Thomas Ihn, Klaus Ensslin

Nano Lett. 18, 6725 - Published 16 October 2018 (arXiv:1802.07317v2)

Tuning Anti-Klein to Klein Tunneling in Bilayer Graphene

Renjun Du (杜人君), Ming-Hao Liu (劉明豪), Jens Mohrmann, Fan Wu (吴凡), Ralph Krupke, Hilbert von Löhneysen, Klaus Richter, and Romain Danneau

Phys. Rev. Lett. 121, 127706 – Published 21 September 2018

Commensurability Oscillations in One-Dimensional Graphene Superlattices

Martin Drienovsky, Jonas Joachimsmeyer, Andreas Sandner, Ming-Hao Liu (劉明豪), Takashi Taniguchi, Kenji Watanabe, Klaus Richter, Dieter Weiss, and Jonathan Eroms

Phys. Rev. Lett. 121, 026806 - Published 11 July 2018

Coexistence of classical snake states and Aharonov-Bohm oscillations along graphene p-n junctions

Péter Makk, Clevin Handschin, Endre Tóvári, Kenji Watanabe, Takashi Taniguchi, Klaus Richter, Ming-Hao Liu (劉明豪), and Christian Schönenberger

Phys. Rev. B 98, 035413 - Published 9 July 2018

2017

Probing spin helical surface states in topological HgTe nanowires

J. Ziegler, R. Kozlovsky, C. Gorini, M.-H. Liu (劉明豪), S. Weishäupl, H. Maier, R. Fischer, D. A. Kozlov, Z. D. Kvon, N. Mikhailov, S. A. Dvoretsky, K. Richter, and D. Weiss

Phys. Rev. B 97, 035157 - Published 29 January 2018

Giant Valley-Isospin Conductance Oscillations in Ballistic Graphene

Clevin Handschin, Péter Makk, Peter Rickhaus, Romain Maurand, Kenji Watanabe, Takashi Taniguchi, Klaus Richter, Ming-Hao Liu, and Christian Schönenberger

Nano Lett. 17, 5389 - Published 14 August 2017 (arXiv:1708.09614)

Oscillating Magnetoresistance in Graphene p–n Junctions at Intermediate Magnetic Fields

Hiske Overweg, Hannah Eggimann, Ming-Hao Liu, Anastasia Varlet, Marius Eich, Pauline Simonet, Yongjin Lee, Kenji Watanabe, Takashi Taniguchi, Klaus Richter, Vladimir I. Fal’ko, Klaus Ensslin, Thomas Ihn

Nano Lett. 17, 2852 - Published 6 April 2017 (arXiv:1612.07624)

Creating and Steering Highly Directional Electron Beams in Graphene

Ming-Hao Liu (劉明豪), Cosimo Gorini, Klaus Richter

Phys. Rev. Lett. 118, 066801 - Published online 8 February 2017 (arXiv:1608.01730)

2016

Fabry-Pérot Resonances in a Graphene/hBN Moiré Superlattice

Clevin Handschin, Péter Makk, Peter Rickhaus, Ming-Hao Liu, K. Watanabe, T. Taniguchi, Klaus Richter, and Christian Schönenberger

Nano Lett. 17, 328 - Published 16 December 2016 (arXiv:1701.09141)

Gate-controlled conductance enhancement from quantum Hall channels along graphene p–n junctions

Endre Tóvári, Péter Makk, Ming-Hao Liu, Peter Rickhaus, Zoltán Kovács-Krausz, Klaus Richter, Christian Schönenberger, Szabolcs Csonka

Nanoscale, 8, 19910 – Published 31 October 2016 (arXiv:1606.08007)

Terahertz ratchet effects in graphene with a lateral superlattice

P. Olbrich, J. Kamann, M. König, J. Munzert, L. Tutsch, J. Eroms, D. Weiss, Ming-Hao Liu (劉明豪), L. E. Golub, E. L. Ivchenko, V. V. Popov, D. V. Fateev, K. V. Mashinsky, F. Fromm, Th. Seyller, and S. D. Ganichev

Phys. Rev. B 93, 075422 – Published 12 February 2016 (arXiv:1510.07946)

2015

Gate tuneable beamsplitter in ballistic graphene

Peter Rickhaus, Péter Makk, Ming-Hao Liu (劉明豪), Klaus Richter, Christian Schönenberger

Appl. Phys. Lett. 107, 251901 - Published online 21 December 2015 (arXiv:1511.03044)

Band gap and broken chirality in single-layer and bilayer graphene

Anastasia Varlet, Ming-Hao Liu, Dominik Bischoff, Pauline Simonet, Takashi Taniguchi, Kenji Watanabe, Klaus Richter, Thomas Ihn, Klaus Ensslin

Physica Status Solidi RRL 10, 46 - Published online 16 September 2015 (arXiv:1508.02648)

Guiding of Electrons in a Few-Mode Ballistic Graphene Channel

Peter Rickhaus, Ming-Hao Liu, Péter Makk, Romain Maurand, Samuel Hess, Simon Zihlmann, Markus Weiss, Klaus Richter, Christian Schönenberger

Nano Lett. 15, 5819 - Published 17 August 2015 (arXiv:1509.02653)

Snake trajectories in ultraclean graphene p-n junctions

Peter Rickhaus, Péter Makk, Ming-Hao Liu, Endre Tóvári, Markus Weiss, Romain Maurand, Klaus Richter, Christian Schönenberger

Nature Communications 6, Article number: 6470 - Published 3 March 2015 (arXiv:1502.01935)

Scalable Tight-Binding Model for Graphene

Ming-Hao Liu (劉明豪), Peter Rickhaus, Péter Makk, Endre Tóvári, Romain Maurand, Fedor Tkatschenko, Markus Weiss, Christian Schönenberger, Klaus Richter

Phys. Rev. Lett. 114, 036601 – Published 22 January 2015 (arXiv:1407.5620)

2014

Fabry-Pérot interference in gapped bilayer graphene with broken anti-Klein tunneling

Anastasia Varlet, Ming-Hao Liu (劉明豪), Viktor Krueckl, Dominik Bischoff, Pauline Simonet, Kenji Watanabe, Takashi Taniguchi, Klaus Richter, Klaus Ensslin, Thomas Ihn

Phys. Rev. Lett. 113, 116601 – Published 8 September 2014 (arXiv:1406.3525)

Towards superlattices: Lateral bipolar multibarriers in graphene

Martin Drienovsky, Franz-Xaver Schrettenbrunner, Andreas Sandner, Dieter Weiss, Jonathan Eroms, Ming-Hao Liu (劉明豪), Fedor Tkatschenko, Klaus Richter

Phys. Rev. B 89, 115421 - Published 17 March 2014